diff --git a/regression/smt2_solver/deep-nesting/deep-let.desc b/regression/smt2_solver/deep-nesting/deep-let.desc
new file mode 100644
index 00000000000..fccd032565d
--- /dev/null
+++ b/regression/smt2_solver/deep-nesting/deep-let.desc
@@ -0,0 +1,13 @@
+CORE
+deep-let.smt2
+
+^EXIT=0$
+^SIGNAL=0$
+^unsat$
+--
+^\(error
+--
+Regression test for the iterative SMT2 parser. A deeply-nested chain of
+`(let ((xN xN-1)) ...)` of depth 3500 parses and solves without overflowing
+the default 8 MB C++ stack. The recursive parser that preceded this change
+segfaults on the same input.
diff --git a/regression/smt2_solver/deep-nesting/deep-let.smt2 b/regression/smt2_solver/deep-nesting/deep-let.smt2
new file mode 100644
index 00000000000..6804d472fb3
--- /dev/null
+++ b/regression/smt2_solver/deep-nesting/deep-let.smt2
@@ -0,0 +1,3512 @@
+; Deeply-nested (let ((xN xN-1)) ...) of depth 3500.
+;
+; Regression test for the iterative SMT2 parser.
+; A recursive parser hits the default 8 MB C++ stack around depth 2500-3000
+; on this input; the iterative parser handles the full depth without stack growth.
+; The chain resolves to the constant 'true', so the assertion is unsat.
+(set-logic QF_BV)
+(define-fun f () Bool
+  (let ((x1 true))
+  (let ((x2 x1))
+  (let ((x3 x2))
+  (let ((x4 x3))
+  (let ((x5 x4))
+  (let ((x6 x5))
+  (let ((x7 x6))
+  (let ((x8 x7))
+  (let ((x9 x8))
+  (let ((x10 x9))
+  (let ((x11 x10))
+  (let ((x12 x11))
+  (let ((x13 x12))
+  (let ((x14 x13))
+  (let ((x15 x14))
+  (let ((x16 x15))
+  (let ((x17 x16))
+  (let ((x18 x17))
+  (let ((x19 x18))
+  (let ((x20 x19))
+  (let ((x21 x20))
+  (let ((x22 x21))
+  (let ((x23 x22))
+  (let ((x24 x23))
+  (let ((x25 x24))
+  (let ((x26 x25))
+  (let ((x27 x26))
+  (let ((x28 x27))
+  (let ((x29 x28))
+  (let ((x30 x29))
+  (let ((x31 x30))
+  (let ((x32 x31))
+  (let ((x33 x32))
+  (let ((x34 x33))
+  (let ((x35 x34))
+  (let ((x36 x35))
+  (let ((x37 x36))
+  (let ((x38 x37))
+  (let ((x39 x38))
+  (let ((x40 x39))
+  (let ((x41 x40))
+  (let ((x42 x41))
+  (let ((x43 x42))
+  (let ((x44 x43))
+  (let ((x45 x44))
+  (let ((x46 x45))
+  (let ((x47 x46))
+  (let ((x48 x47))
+  (let ((x49 x48))
+  (let ((x50 x49))
+  (let ((x51 x50))
+  (let ((x52 x51))
+  (let ((x53 x52))
+  (let ((x54 x53))
+  (let ((x55 x54))
+  (let ((x56 x55))
+  (let ((x57 x56))
+  (let ((x58 x57))
+  (let ((x59 x58))
+  (let ((x60 x59))
+  (let ((x61 x60))
+  (let ((x62 x61))
+  (let ((x63 x62))
+  (let ((x64 x63))
+  (let ((x65 x64))
+  (let ((x66 x65))
+  (let ((x67 x66))
+  (let ((x68 x67))
+  (let ((x69 x68))
+  (let ((x70 x69))
+  (let ((x71 x70))
+  (let ((x72 x71))
+  (let ((x73 x72))
+  (let ((x74 x73))
+  (let ((x75 x74))
+  (let ((x76 x75))
+  (let ((x77 x76))
+  (let ((x78 x77))
+  (let ((x79 x78))
+  (let ((x80 x79))
+  (let ((x81 x80))
+  (let ((x82 x81))
+  (let ((x83 x82))
+  (let ((x84 x83))
+  (let ((x85 x84))
+  (let ((x86 x85))
+  (let ((x87 x86))
+  (let ((x88 x87))
+  (let ((x89 x88))
+  (let ((x90 x89))
+  (let ((x91 x90))
+  (let ((x92 x91))
+  (let ((x93 x92))
+  (let ((x94 x93))
+  (let ((x95 x94))
+  (let ((x96 x95))
+  (let ((x97 x96))
+  (let ((x98 x97))
+  (let ((x99 x98))
+  (let ((x100 x99))
+  (let ((x101 x100))
+  (let ((x102 x101))
+  (let ((x103 x102))
+  (let ((x104 x103))
+  (let ((x105 x104))
+  (let ((x106 x105))
+  (let ((x107 x106))
+  (let ((x108 x107))
+  (let ((x109 x108))
+  (let ((x110 x109))
+  (let ((x111 x110))
+  (let ((x112 x111))
+  (let ((x113 x112))
+  (let ((x114 x113))
+  (let ((x115 x114))
+  (let ((x116 x115))
+  (let ((x117 x116))
+  (let ((x118 x117))
+  (let ((x119 x118))
+  (let ((x120 x119))
+  (let ((x121 x120))
+  (let ((x122 x121))
+  (let ((x123 x122))
+  (let ((x124 x123))
+  (let ((x125 x124))
+  (let ((x126 x125))
+  (let ((x127 x126))
+  (let ((x128 x127))
+  (let ((x129 x128))
+  (let ((x130 x129))
+  (let ((x131 x130))
+  (let ((x132 x131))
+  (let ((x133 x132))
+  (let ((x134 x133))
+  (let ((x135 x134))
+  (let ((x136 x135))
+  (let ((x137 x136))
+  (let ((x138 x137))
+  (let ((x139 x138))
+  (let ((x140 x139))
+  (let ((x141 x140))
+  (let ((x142 x141))
+  (let ((x143 x142))
+  (let ((x144 x143))
+  (let ((x145 x144))
+  (let ((x146 x145))
+  (let ((x147 x146))
+  (let ((x148 x147))
+  (let ((x149 x148))
+  (let ((x150 x149))
+  (let ((x151 x150))
+  (let ((x152 x151))
+  (let ((x153 x152))
+  (let ((x154 x153))
+  (let ((x155 x154))
+  (let ((x156 x155))
+  (let ((x157 x156))
+  (let ((x158 x157))
+  (let ((x159 x158))
+  (let ((x160 x159))
+  (let ((x161 x160))
+  (let ((x162 x161))
+  (let ((x163 x162))
+  (let ((x164 x163))
+  (let ((x165 x164))
+  (let ((x166 x165))
+  (let ((x167 x166))
+  (let ((x168 x167))
+  (let ((x169 x168))
+  (let ((x170 x169))
+  (let ((x171 x170))
+  (let ((x172 x171))
+  (let ((x173 x172))
+  (let ((x174 x173))
+  (let ((x175 x174))
+  (let ((x176 x175))
+  (let ((x177 x176))
+  (let ((x178 x177))
+  (let ((x179 x178))
+  (let ((x180 x179))
+  (let ((x181 x180))
+  (let ((x182 x181))
+  (let ((x183 x182))
+  (let ((x184 x183))
+  (let ((x185 x184))
+  (let ((x186 x185))
+  (let ((x187 x186))
+  (let ((x188 x187))
+  (let ((x189 x188))
+  (let ((x190 x189))
+  (let ((x191 x190))
+  (let ((x192 x191))
+  (let ((x193 x192))
+  (let ((x194 x193))
+  (let ((x195 x194))
+  (let ((x196 x195))
+  (let ((x197 x196))
+  (let ((x198 x197))
+  (let ((x199 x198))
+  (let ((x200 x199))
+  (let ((x201 x200))
+  (let ((x202 x201))
+  (let ((x203 x202))
+  (let ((x204 x203))
+  (let ((x205 x204))
+  (let ((x206 x205))
+  (let ((x207 x206))
+  (let ((x208 x207))
+  (let ((x209 x208))
+  (let ((x210 x209))
+  (let ((x211 x210))
+  (let ((x212 x211))
+  (let ((x213 x212))
+  (let ((x214 x213))
+  (let ((x215 x214))
+  (let ((x216 x215))
+  (let ((x217 x216))
+  (let ((x218 x217))
+  (let ((x219 x218))
+  (let ((x220 x219))
+  (let ((x221 x220))
+  (let ((x222 x221))
+  (let ((x223 x222))
+  (let ((x224 x223))
+  (let ((x225 x224))
+  (let ((x226 x225))
+  (let ((x227 x226))
+  (let ((x228 x227))
+  (let ((x229 x228))
+  (let ((x230 x229))
+  (let ((x231 x230))
+  (let ((x232 x231))
+  (let ((x233 x232))
+  (let ((x234 x233))
+  (let ((x235 x234))
+  (let ((x236 x235))
+  (let ((x237 x236))
+  (let ((x238 x237))
+  (let ((x239 x238))
+  (let ((x240 x239))
+  (let ((x241 x240))
+  (let ((x242 x241))
+  (let ((x243 x242))
+  (let ((x244 x243))
+  (let ((x245 x244))
+  (let ((x246 x245))
+  (let ((x247 x246))
+  (let ((x248 x247))
+  (let ((x249 x248))
+  (let ((x250 x249))
+  (let ((x251 x250))
+  (let ((x252 x251))
+  (let ((x253 x252))
+  (let ((x254 x253))
+  (let ((x255 x254))
+  (let ((x256 x255))
+  (let ((x257 x256))
+  (let ((x258 x257))
+  (let ((x259 x258))
+  (let ((x260 x259))
+  (let ((x261 x260))
+  (let ((x262 x261))
+  (let ((x263 x262))
+  (let ((x264 x263))
+  (let ((x265 x264))
+  (let ((x266 x265))
+  (let ((x267 x266))
+  (let ((x268 x267))
+  (let ((x269 x268))
+  (let ((x270 x269))
+  (let ((x271 x270))
+  (let ((x272 x271))
+  (let ((x273 x272))
+  (let ((x274 x273))
+  (let ((x275 x274))
+  (let ((x276 x275))
+  (let ((x277 x276))
+  (let ((x278 x277))
+  (let ((x279 x278))
+  (let ((x280 x279))
+  (let ((x281 x280))
+  (let ((x282 x281))
+  (let ((x283 x282))
+  (let ((x284 x283))
+  (let ((x285 x284))
+  (let ((x286 x285))
+  (let ((x287 x286))
+  (let ((x288 x287))
+  (let ((x289 x288))
+  (let ((x290 x289))
+  (let ((x291 x290))
+  (let ((x292 x291))
+  (let ((x293 x292))
+  (let ((x294 x293))
+  (let ((x295 x294))
+  (let ((x296 x295))
+  (let ((x297 x296))
+  (let ((x298 x297))
+  (let ((x299 x298))
+  (let ((x300 x299))
+  (let ((x301 x300))
+  (let ((x302 x301))
+  (let ((x303 x302))
+  (let ((x304 x303))
+  (let ((x305 x304))
+  (let ((x306 x305))
+  (let ((x307 x306))
+  (let ((x308 x307))
+  (let ((x309 x308))
+  (let ((x310 x309))
+  (let ((x311 x310))
+  (let ((x312 x311))
+  (let ((x313 x312))
+  (let ((x314 x313))
+  (let ((x315 x314))
+  (let ((x316 x315))
+  (let ((x317 x316))
+  (let ((x318 x317))
+  (let ((x319 x318))
+  (let ((x320 x319))
+  (let ((x321 x320))
+  (let ((x322 x321))
+  (let ((x323 x322))
+  (let ((x324 x323))
+  (let ((x325 x324))
+  (let ((x326 x325))
+  (let ((x327 x326))
+  (let ((x328 x327))
+  (let ((x329 x328))
+  (let ((x330 x329))
+  (let ((x331 x330))
+  (let ((x332 x331))
+  (let ((x333 x332))
+  (let ((x334 x333))
+  (let ((x335 x334))
+  (let ((x336 x335))
+  (let ((x337 x336))
+  (let ((x338 x337))
+  (let ((x339 x338))
+  (let ((x340 x339))
+  (let ((x341 x340))
+  (let ((x342 x341))
+  (let ((x343 x342))
+  (let ((x344 x343))
+  (let ((x345 x344))
+  (let ((x346 x345))
+  (let ((x347 x346))
+  (let ((x348 x347))
+  (let ((x349 x348))
+  (let ((x350 x349))
+  (let ((x351 x350))
+  (let ((x352 x351))
+  (let ((x353 x352))
+  (let ((x354 x353))
+  (let ((x355 x354))
+  (let ((x356 x355))
+  (let ((x357 x356))
+  (let ((x358 x357))
+  (let ((x359 x358))
+  (let ((x360 x359))
+  (let ((x361 x360))
+  (let ((x362 x361))
+  (let ((x363 x362))
+  (let ((x364 x363))
+  (let ((x365 x364))
+  (let ((x366 x365))
+  (let ((x367 x366))
+  (let ((x368 x367))
+  (let ((x369 x368))
+  (let ((x370 x369))
+  (let ((x371 x370))
+  (let ((x372 x371))
+  (let ((x373 x372))
+  (let ((x374 x373))
+  (let ((x375 x374))
+  (let ((x376 x375))
+  (let ((x377 x376))
+  (let ((x378 x377))
+  (let ((x379 x378))
+  (let ((x380 x379))
+  (let ((x381 x380))
+  (let ((x382 x381))
+  (let ((x383 x382))
+  (let ((x384 x383))
+  (let ((x385 x384))
+  (let ((x386 x385))
+  (let ((x387 x386))
+  (let ((x388 x387))
+  (let ((x389 x388))
+  (let ((x390 x389))
+  (let ((x391 x390))
+  (let ((x392 x391))
+  (let ((x393 x392))
+  (let ((x394 x393))
+  (let ((x395 x394))
+  (let ((x396 x395))
+  (let ((x397 x396))
+  (let ((x398 x397))
+  (let ((x399 x398))
+  (let ((x400 x399))
+  (let ((x401 x400))
+  (let ((x402 x401))
+  (let ((x403 x402))
+  (let ((x404 x403))
+  (let ((x405 x404))
+  (let ((x406 x405))
+  (let ((x407 x406))
+  (let ((x408 x407))
+  (let ((x409 x408))
+  (let ((x410 x409))
+  (let ((x411 x410))
+  (let ((x412 x411))
+  (let ((x413 x412))
+  (let ((x414 x413))
+  (let ((x415 x414))
+  (let ((x416 x415))
+  (let ((x417 x416))
+  (let ((x418 x417))
+  (let ((x419 x418))
+  (let ((x420 x419))
+  (let ((x421 x420))
+  (let ((x422 x421))
+  (let ((x423 x422))
+  (let ((x424 x423))
+  (let ((x425 x424))
+  (let ((x426 x425))
+  (let ((x427 x426))
+  (let ((x428 x427))
+  (let ((x429 x428))
+  (let ((x430 x429))
+  (let ((x431 x430))
+  (let ((x432 x431))
+  (let ((x433 x432))
+  (let ((x434 x433))
+  (let ((x435 x434))
+  (let ((x436 x435))
+  (let ((x437 x436))
+  (let ((x438 x437))
+  (let ((x439 x438))
+  (let ((x440 x439))
+  (let ((x441 x440))
+  (let ((x442 x441))
+  (let ((x443 x442))
+  (let ((x444 x443))
+  (let ((x445 x444))
+  (let ((x446 x445))
+  (let ((x447 x446))
+  (let ((x448 x447))
+  (let ((x449 x448))
+  (let ((x450 x449))
+  (let ((x451 x450))
+  (let ((x452 x451))
+  (let ((x453 x452))
+  (let ((x454 x453))
+  (let ((x455 x454))
+  (let ((x456 x455))
+  (let ((x457 x456))
+  (let ((x458 x457))
+  (let ((x459 x458))
+  (let ((x460 x459))
+  (let ((x461 x460))
+  (let ((x462 x461))
+  (let ((x463 x462))
+  (let ((x464 x463))
+  (let ((x465 x464))
+  (let ((x466 x465))
+  (let ((x467 x466))
+  (let ((x468 x467))
+  (let ((x469 x468))
+  (let ((x470 x469))
+  (let ((x471 x470))
+  (let ((x472 x471))
+  (let ((x473 x472))
+  (let ((x474 x473))
+  (let ((x475 x474))
+  (let ((x476 x475))
+  (let ((x477 x476))
+  (let ((x478 x477))
+  (let ((x479 x478))
+  (let ((x480 x479))
+  (let ((x481 x480))
+  (let ((x482 x481))
+  (let ((x483 x482))
+  (let ((x484 x483))
+  (let ((x485 x484))
+  (let ((x486 x485))
+  (let ((x487 x486))
+  (let ((x488 x487))
+  (let ((x489 x488))
+  (let ((x490 x489))
+  (let ((x491 x490))
+  (let ((x492 x491))
+  (let ((x493 x492))
+  (let ((x494 x493))
+  (let ((x495 x494))
+  (let ((x496 x495))
+  (let ((x497 x496))
+  (let ((x498 x497))
+  (let ((x499 x498))
+  (let ((x500 x499))
+  (let ((x501 x500))
+  (let ((x502 x501))
+  (let ((x503 x502))
+  (let ((x504 x503))
+  (let ((x505 x504))
+  (let ((x506 x505))
+  (let ((x507 x506))
+  (let ((x508 x507))
+  (let ((x509 x508))
+  (let ((x510 x509))
+  (let ((x511 x510))
+  (let ((x512 x511))
+  (let ((x513 x512))
+  (let ((x514 x513))
+  (let ((x515 x514))
+  (let ((x516 x515))
+  (let ((x517 x516))
+  (let ((x518 x517))
+  (let ((x519 x518))
+  (let ((x520 x519))
+  (let ((x521 x520))
+  (let ((x522 x521))
+  (let ((x523 x522))
+  (let ((x524 x523))
+  (let ((x525 x524))
+  (let ((x526 x525))
+  (let ((x527 x526))
+  (let ((x528 x527))
+  (let ((x529 x528))
+  (let ((x530 x529))
+  (let ((x531 x530))
+  (let ((x532 x531))
+  (let ((x533 x532))
+  (let ((x534 x533))
+  (let ((x535 x534))
+  (let ((x536 x535))
+  (let ((x537 x536))
+  (let ((x538 x537))
+  (let ((x539 x538))
+  (let ((x540 x539))
+  (let ((x541 x540))
+  (let ((x542 x541))
+  (let ((x543 x542))
+  (let ((x544 x543))
+  (let ((x545 x544))
+  (let ((x546 x545))
+  (let ((x547 x546))
+  (let ((x548 x547))
+  (let ((x549 x548))
+  (let ((x550 x549))
+  (let ((x551 x550))
+  (let ((x552 x551))
+  (let ((x553 x552))
+  (let ((x554 x553))
+  (let ((x555 x554))
+  (let ((x556 x555))
+  (let ((x557 x556))
+  (let ((x558 x557))
+  (let ((x559 x558))
+  (let ((x560 x559))
+  (let ((x561 x560))
+  (let ((x562 x561))
+  (let ((x563 x562))
+  (let ((x564 x563))
+  (let ((x565 x564))
+  (let ((x566 x565))
+  (let ((x567 x566))
+  (let ((x568 x567))
+  (let ((x569 x568))
+  (let ((x570 x569))
+  (let ((x571 x570))
+  (let ((x572 x571))
+  (let ((x573 x572))
+  (let ((x574 x573))
+  (let ((x575 x574))
+  (let ((x576 x575))
+  (let ((x577 x576))
+  (let ((x578 x577))
+  (let ((x579 x578))
+  (let ((x580 x579))
+  (let ((x581 x580))
+  (let ((x582 x581))
+  (let ((x583 x582))
+  (let ((x584 x583))
+  (let ((x585 x584))
+  (let ((x586 x585))
+  (let ((x587 x586))
+  (let ((x588 x587))
+  (let ((x589 x588))
+  (let ((x590 x589))
+  (let ((x591 x590))
+  (let ((x592 x591))
+  (let ((x593 x592))
+  (let ((x594 x593))
+  (let ((x595 x594))
+  (let ((x596 x595))
+  (let ((x597 x596))
+  (let ((x598 x597))
+  (let ((x599 x598))
+  (let ((x600 x599))
+  (let ((x601 x600))
+  (let ((x602 x601))
+  (let ((x603 x602))
+  (let ((x604 x603))
+  (let ((x605 x604))
+  (let ((x606 x605))
+  (let ((x607 x606))
+  (let ((x608 x607))
+  (let ((x609 x608))
+  (let ((x610 x609))
+  (let ((x611 x610))
+  (let ((x612 x611))
+  (let ((x613 x612))
+  (let ((x614 x613))
+  (let ((x615 x614))
+  (let ((x616 x615))
+  (let ((x617 x616))
+  (let ((x618 x617))
+  (let ((x619 x618))
+  (let ((x620 x619))
+  (let ((x621 x620))
+  (let ((x622 x621))
+  (let ((x623 x622))
+  (let ((x624 x623))
+  (let ((x625 x624))
+  (let ((x626 x625))
+  (let ((x627 x626))
+  (let ((x628 x627))
+  (let ((x629 x628))
+  (let ((x630 x629))
+  (let ((x631 x630))
+  (let ((x632 x631))
+  (let ((x633 x632))
+  (let ((x634 x633))
+  (let ((x635 x634))
+  (let ((x636 x635))
+  (let ((x637 x636))
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+  (let ((x1828 x1827))
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+  (let ((x1839 x1838))
+  (let ((x1840 x1839))
+  (let ((x1841 x1840))
+  (let ((x1842 x1841))
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+  (let ((x3023 x3022))
+  (let ((x3024 x3023))
+  (let ((x3025 x3024))
+  (let ((x3026 x3025))
+  (let ((x3027 x3026))
+  (let ((x3028 x3027))
+  (let ((x3029 x3028))
+  (let ((x3030 x3029))
+  (let ((x3031 x3030))
+  (let ((x3032 x3031))
+  (let ((x3033 x3032))
+  (let ((x3034 x3033))
+  (let ((x3035 x3034))
+  (let ((x3036 x3035))
+  (let ((x3037 x3036))
+  (let ((x3038 x3037))
+  (let ((x3039 x3038))
+  (let ((x3040 x3039))
+  (let ((x3041 x3040))
+  (let ((x3042 x3041))
+  (let ((x3043 x3042))
+  (let ((x3044 x3043))
+  (let ((x3045 x3044))
+  (let ((x3046 x3045))
+  (let ((x3047 x3046))
+  (let ((x3048 x3047))
+  (let ((x3049 x3048))
+  (let ((x3050 x3049))
+  (let ((x3051 x3050))
+  (let ((x3052 x3051))
+  (let ((x3053 x3052))
+  (let ((x3054 x3053))
+  (let ((x3055 x3054))
+  (let ((x3056 x3055))
+  (let ((x3057 x3056))
+  (let ((x3058 x3057))
+  (let ((x3059 x3058))
+  (let ((x3060 x3059))
+  (let ((x3061 x3060))
+  (let ((x3062 x3061))
+  (let ((x3063 x3062))
+  (let ((x3064 x3063))
+  (let ((x3065 x3064))
+  (let ((x3066 x3065))
+  (let ((x3067 x3066))
+  (let ((x3068 x3067))
+  (let ((x3069 x3068))
+  (let ((x3070 x3069))
+  (let ((x3071 x3070))
+  (let ((x3072 x3071))
+  (let ((x3073 x3072))
+  (let ((x3074 x3073))
+  (let ((x3075 x3074))
+  (let ((x3076 x3075))
+  (let ((x3077 x3076))
+  (let ((x3078 x3077))
+  (let ((x3079 x3078))
+  (let ((x3080 x3079))
+  (let ((x3081 x3080))
+  (let ((x3082 x3081))
+  (let ((x3083 x3082))
+  (let ((x3084 x3083))
+  (let ((x3085 x3084))
+  (let ((x3086 x3085))
+  (let ((x3087 x3086))
+  (let ((x3088 x3087))
+  (let ((x3089 x3088))
+  (let ((x3090 x3089))
+  (let ((x3091 x3090))
+  (let ((x3092 x3091))
+  (let ((x3093 x3092))
+  (let ((x3094 x3093))
+  (let ((x3095 x3094))
+  (let ((x3096 x3095))
+  (let ((x3097 x3096))
+  (let ((x3098 x3097))
+  (let ((x3099 x3098))
+  (let ((x3100 x3099))
+  (let ((x3101 x3100))
+  (let ((x3102 x3101))
+  (let ((x3103 x3102))
+  (let ((x3104 x3103))
+  (let ((x3105 x3104))
+  (let ((x3106 x3105))
+  (let ((x3107 x3106))
+  (let ((x3108 x3107))
+  (let ((x3109 x3108))
+  (let ((x3110 x3109))
+  (let ((x3111 x3110))
+  (let ((x3112 x3111))
+  (let ((x3113 x3112))
+  (let ((x3114 x3113))
+  (let ((x3115 x3114))
+  (let ((x3116 x3115))
+  (let ((x3117 x3116))
+  (let ((x3118 x3117))
+  (let ((x3119 x3118))
+  (let ((x3120 x3119))
+  (let ((x3121 x3120))
+  (let ((x3122 x3121))
+  (let ((x3123 x3122))
+  (let ((x3124 x3123))
+  (let ((x3125 x3124))
+  (let ((x3126 x3125))
+  (let ((x3127 x3126))
+  (let ((x3128 x3127))
+  (let ((x3129 x3128))
+  (let ((x3130 x3129))
+  (let ((x3131 x3130))
+  (let ((x3132 x3131))
+  (let ((x3133 x3132))
+  (let ((x3134 x3133))
+  (let ((x3135 x3134))
+  (let ((x3136 x3135))
+  (let ((x3137 x3136))
+  (let ((x3138 x3137))
+  (let ((x3139 x3138))
+  (let ((x3140 x3139))
+  (let ((x3141 x3140))
+  (let ((x3142 x3141))
+  (let ((x3143 x3142))
+  (let ((x3144 x3143))
+  (let ((x3145 x3144))
+  (let ((x3146 x3145))
+  (let ((x3147 x3146))
+  (let ((x3148 x3147))
+  (let ((x3149 x3148))
+  (let ((x3150 x3149))
+  (let ((x3151 x3150))
+  (let ((x3152 x3151))
+  (let ((x3153 x3152))
+  (let ((x3154 x3153))
+  (let ((x3155 x3154))
+  (let ((x3156 x3155))
+  (let ((x3157 x3156))
+  (let ((x3158 x3157))
+  (let ((x3159 x3158))
+  (let ((x3160 x3159))
+  (let ((x3161 x3160))
+  (let ((x3162 x3161))
+  (let ((x3163 x3162))
+  (let ((x3164 x3163))
+  (let ((x3165 x3164))
+  (let ((x3166 x3165))
+  (let ((x3167 x3166))
+  (let ((x3168 x3167))
+  (let ((x3169 x3168))
+  (let ((x3170 x3169))
+  (let ((x3171 x3170))
+  (let ((x3172 x3171))
+  (let ((x3173 x3172))
+  (let ((x3174 x3173))
+  (let ((x3175 x3174))
+  (let ((x3176 x3175))
+  (let ((x3177 x3176))
+  (let ((x3178 x3177))
+  (let ((x3179 x3178))
+  (let ((x3180 x3179))
+  (let ((x3181 x3180))
+  (let ((x3182 x3181))
+  (let ((x3183 x3182))
+  (let ((x3184 x3183))
+  (let ((x3185 x3184))
+  (let ((x3186 x3185))
+  (let ((x3187 x3186))
+  (let ((x3188 x3187))
+  (let ((x3189 x3188))
+  (let ((x3190 x3189))
+  (let ((x3191 x3190))
+  (let ((x3192 x3191))
+  (let ((x3193 x3192))
+  (let ((x3194 x3193))
+  (let ((x3195 x3194))
+  (let ((x3196 x3195))
+  (let ((x3197 x3196))
+  (let ((x3198 x3197))
+  (let ((x3199 x3198))
+  (let ((x3200 x3199))
+  (let ((x3201 x3200))
+  (let ((x3202 x3201))
+  (let ((x3203 x3202))
+  (let ((x3204 x3203))
+  (let ((x3205 x3204))
+  (let ((x3206 x3205))
+  (let ((x3207 x3206))
+  (let ((x3208 x3207))
+  (let ((x3209 x3208))
+  (let ((x3210 x3209))
+  (let ((x3211 x3210))
+  (let ((x3212 x3211))
+  (let ((x3213 x3212))
+  (let ((x3214 x3213))
+  (let ((x3215 x3214))
+  (let ((x3216 x3215))
+  (let ((x3217 x3216))
+  (let ((x3218 x3217))
+  (let ((x3219 x3218))
+  (let ((x3220 x3219))
+  (let ((x3221 x3220))
+  (let ((x3222 x3221))
+  (let ((x3223 x3222))
+  (let ((x3224 x3223))
+  (let ((x3225 x3224))
+  (let ((x3226 x3225))
+  (let ((x3227 x3226))
+  (let ((x3228 x3227))
+  (let ((x3229 x3228))
+  (let ((x3230 x3229))
+  (let ((x3231 x3230))
+  (let ((x3232 x3231))
+  (let ((x3233 x3232))
+  (let ((x3234 x3233))
+  (let ((x3235 x3234))
+  (let ((x3236 x3235))
+  (let ((x3237 x3236))
+  (let ((x3238 x3237))
+  (let ((x3239 x3238))
+  (let ((x3240 x3239))
+  (let ((x3241 x3240))
+  (let ((x3242 x3241))
+  (let ((x3243 x3242))
+  (let ((x3244 x3243))
+  (let ((x3245 x3244))
+  (let ((x3246 x3245))
+  (let ((x3247 x3246))
+  (let ((x3248 x3247))
+  (let ((x3249 x3248))
+  (let ((x3250 x3249))
+  (let ((x3251 x3250))
+  (let ((x3252 x3251))
+  (let ((x3253 x3252))
+  (let ((x3254 x3253))
+  (let ((x3255 x3254))
+  (let ((x3256 x3255))
+  (let ((x3257 x3256))
+  (let ((x3258 x3257))
+  (let ((x3259 x3258))
+  (let ((x3260 x3259))
+  (let ((x3261 x3260))
+  (let ((x3262 x3261))
+  (let ((x3263 x3262))
+  (let ((x3264 x3263))
+  (let ((x3265 x3264))
+  (let ((x3266 x3265))
+  (let ((x3267 x3266))
+  (let ((x3268 x3267))
+  (let ((x3269 x3268))
+  (let ((x3270 x3269))
+  (let ((x3271 x3270))
+  (let ((x3272 x3271))
+  (let ((x3273 x3272))
+  (let ((x3274 x3273))
+  (let ((x3275 x3274))
+  (let ((x3276 x3275))
+  (let ((x3277 x3276))
+  (let ((x3278 x3277))
+  (let ((x3279 x3278))
+  (let ((x3280 x3279))
+  (let ((x3281 x3280))
+  (let ((x3282 x3281))
+  (let ((x3283 x3282))
+  (let ((x3284 x3283))
+  (let ((x3285 x3284))
+  (let ((x3286 x3285))
+  (let ((x3287 x3286))
+  (let ((x3288 x3287))
+  (let ((x3289 x3288))
+  (let ((x3290 x3289))
+  (let ((x3291 x3290))
+  (let ((x3292 x3291))
+  (let ((x3293 x3292))
+  (let ((x3294 x3293))
+  (let ((x3295 x3294))
+  (let ((x3296 x3295))
+  (let ((x3297 x3296))
+  (let ((x3298 x3297))
+  (let ((x3299 x3298))
+  (let ((x3300 x3299))
+  (let ((x3301 x3300))
+  (let ((x3302 x3301))
+  (let ((x3303 x3302))
+  (let ((x3304 x3303))
+  (let ((x3305 x3304))
+  (let ((x3306 x3305))
+  (let ((x3307 x3306))
+  (let ((x3308 x3307))
+  (let ((x3309 x3308))
+  (let ((x3310 x3309))
+  (let ((x3311 x3310))
+  (let ((x3312 x3311))
+  (let ((x3313 x3312))
+  (let ((x3314 x3313))
+  (let ((x3315 x3314))
+  (let ((x3316 x3315))
+  (let ((x3317 x3316))
+  (let ((x3318 x3317))
+  (let ((x3319 x3318))
+  (let ((x3320 x3319))
+  (let ((x3321 x3320))
+  (let ((x3322 x3321))
+  (let ((x3323 x3322))
+  (let ((x3324 x3323))
+  (let ((x3325 x3324))
+  (let ((x3326 x3325))
+  (let ((x3327 x3326))
+  (let ((x3328 x3327))
+  (let ((x3329 x3328))
+  (let ((x3330 x3329))
+  (let ((x3331 x3330))
+  (let ((x3332 x3331))
+  (let ((x3333 x3332))
+  (let ((x3334 x3333))
+  (let ((x3335 x3334))
+  (let ((x3336 x3335))
+  (let ((x3337 x3336))
+  (let ((x3338 x3337))
+  (let ((x3339 x3338))
+  (let ((x3340 x3339))
+  (let ((x3341 x3340))
+  (let ((x3342 x3341))
+  (let ((x3343 x3342))
+  (let ((x3344 x3343))
+  (let ((x3345 x3344))
+  (let ((x3346 x3345))
+  (let ((x3347 x3346))
+  (let ((x3348 x3347))
+  (let ((x3349 x3348))
+  (let ((x3350 x3349))
+  (let ((x3351 x3350))
+  (let ((x3352 x3351))
+  (let ((x3353 x3352))
+  (let ((x3354 x3353))
+  (let ((x3355 x3354))
+  (let ((x3356 x3355))
+  (let ((x3357 x3356))
+  (let ((x3358 x3357))
+  (let ((x3359 x3358))
+  (let ((x3360 x3359))
+  (let ((x3361 x3360))
+  (let ((x3362 x3361))
+  (let ((x3363 x3362))
+  (let ((x3364 x3363))
+  (let ((x3365 x3364))
+  (let ((x3366 x3365))
+  (let ((x3367 x3366))
+  (let ((x3368 x3367))
+  (let ((x3369 x3368))
+  (let ((x3370 x3369))
+  (let ((x3371 x3370))
+  (let ((x3372 x3371))
+  (let ((x3373 x3372))
+  (let ((x3374 x3373))
+  (let ((x3375 x3374))
+  (let ((x3376 x3375))
+  (let ((x3377 x3376))
+  (let ((x3378 x3377))
+  (let ((x3379 x3378))
+  (let ((x3380 x3379))
+  (let ((x3381 x3380))
+  (let ((x3382 x3381))
+  (let ((x3383 x3382))
+  (let ((x3384 x3383))
+  (let ((x3385 x3384))
+  (let ((x3386 x3385))
+  (let ((x3387 x3386))
+  (let ((x3388 x3387))
+  (let ((x3389 x3388))
+  (let ((x3390 x3389))
+  (let ((x3391 x3390))
+  (let ((x3392 x3391))
+  (let ((x3393 x3392))
+  (let ((x3394 x3393))
+  (let ((x3395 x3394))
+  (let ((x3396 x3395))
+  (let ((x3397 x3396))
+  (let ((x3398 x3397))
+  (let ((x3399 x3398))
+  (let ((x3400 x3399))
+  (let ((x3401 x3400))
+  (let ((x3402 x3401))
+  (let ((x3403 x3402))
+  (let ((x3404 x3403))
+  (let ((x3405 x3404))
+  (let ((x3406 x3405))
+  (let ((x3407 x3406))
+  (let ((x3408 x3407))
+  (let ((x3409 x3408))
+  (let ((x3410 x3409))
+  (let ((x3411 x3410))
+  (let ((x3412 x3411))
+  (let ((x3413 x3412))
+  (let ((x3414 x3413))
+  (let ((x3415 x3414))
+  (let ((x3416 x3415))
+  (let ((x3417 x3416))
+  (let ((x3418 x3417))
+  (let ((x3419 x3418))
+  (let ((x3420 x3419))
+  (let ((x3421 x3420))
+  (let ((x3422 x3421))
+  (let ((x3423 x3422))
+  (let ((x3424 x3423))
+  (let ((x3425 x3424))
+  (let ((x3426 x3425))
+  (let ((x3427 x3426))
+  (let ((x3428 x3427))
+  (let ((x3429 x3428))
+  (let ((x3430 x3429))
+  (let ((x3431 x3430))
+  (let ((x3432 x3431))
+  (let ((x3433 x3432))
+  (let ((x3434 x3433))
+  (let ((x3435 x3434))
+  (let ((x3436 x3435))
+  (let ((x3437 x3436))
+  (let ((x3438 x3437))
+  (let ((x3439 x3438))
+  (let ((x3440 x3439))
+  (let ((x3441 x3440))
+  (let ((x3442 x3441))
+  (let ((x3443 x3442))
+  (let ((x3444 x3443))
+  (let ((x3445 x3444))
+  (let ((x3446 x3445))
+  (let ((x3447 x3446))
+  (let ((x3448 x3447))
+  (let ((x3449 x3448))
+  (let ((x3450 x3449))
+  (let ((x3451 x3450))
+  (let ((x3452 x3451))
+  (let ((x3453 x3452))
+  (let ((x3454 x3453))
+  (let ((x3455 x3454))
+  (let ((x3456 x3455))
+  (let ((x3457 x3456))
+  (let ((x3458 x3457))
+  (let ((x3459 x3458))
+  (let ((x3460 x3459))
+  (let ((x3461 x3460))
+  (let ((x3462 x3461))
+  (let ((x3463 x3462))
+  (let ((x3464 x3463))
+  (let ((x3465 x3464))
+  (let ((x3466 x3465))
+  (let ((x3467 x3466))
+  (let ((x3468 x3467))
+  (let ((x3469 x3468))
+  (let ((x3470 x3469))
+  (let ((x3471 x3470))
+  (let ((x3472 x3471))
+  (let ((x3473 x3472))
+  (let ((x3474 x3473))
+  (let ((x3475 x3474))
+  (let ((x3476 x3475))
+  (let ((x3477 x3476))
+  (let ((x3478 x3477))
+  (let ((x3479 x3478))
+  (let ((x3480 x3479))
+  (let ((x3481 x3480))
+  (let ((x3482 x3481))
+  (let ((x3483 x3482))
+  (let ((x3484 x3483))
+  (let ((x3485 x3484))
+  (let ((x3486 x3485))
+  (let ((x3487 x3486))
+  (let ((x3488 x3487))
+  (let ((x3489 x3488))
+  (let ((x3490 x3489))
+  (let ((x3491 x3490))
+  (let ((x3492 x3491))
+  (let ((x3493 x3492))
+  (let ((x3494 x3493))
+  (let ((x3495 x3494))
+  (let ((x3496 x3495))
+  (let ((x3497 x3496))
+  (let ((x3498 x3497))
+  (let ((x3499 x3498))
+  (let ((x3500 x3499))
+    x3500
+  )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
+(assert (not f))
+(check-sat)
diff --git a/regression/smt2_solver/deep-nesting/deep-operand-chain.desc b/regression/smt2_solver/deep-nesting/deep-operand-chain.desc
new file mode 100644
index 00000000000..4814689ff69
--- /dev/null
+++ b/regression/smt2_solver/deep-nesting/deep-operand-chain.desc
@@ -0,0 +1,13 @@
+CORE
+deep-operand-chain.smt2
+
+^EXIT=0$
+^SIGNAL=0$
+^sat$
+--
+^\(error
+--
+Regression test for the iterative SMT2 expression parser. A deeply right-
+associated operand chain `(bvand x (bvand x (bvand x ... x)))` of depth 5000
+is parsed and solved without overflowing the default 8 MB C++ stack. The
+recursive operand-collection path segfaults on the same input.
diff --git a/regression/smt2_solver/deep-nesting/deep-operand-chain.smt2 b/regression/smt2_solver/deep-nesting/deep-operand-chain.smt2
new file mode 100644
index 00000000000..eb296e07a40
--- /dev/null
+++ b/regression/smt2_solver/deep-nesting/deep-operand-chain.smt2
@@ -0,0 +1,11 @@
+; Right-associated (bvand x (bvand x (bvand x ... x))) of depth 3500.
+;
+; Regression test for the iterative SMT2 expression parser.
+; The recursive operand-collection path segfaults on this input at
+; depth >= 3000; the iterative path handles it. Result is trivially sat.
+(set-logic QF_BV)
+(declare-const x (_ BitVec 8))
+(assert (= x
+  (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x 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(bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x (bvand x x))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
+))
+(check-sat)
diff --git a/src/solvers/smt2/smt2_parser.cpp b/src/solvers/smt2/smt2_parser.cpp
index f233905dd20..d95bc60149f 100644
--- a/src/solvers/smt2/smt2_parser.cpp
+++ b/src/solvers/smt2/smt2_parser.cpp
@@ -8,8 +8,6 @@ Author: Daniel Kroening, kroening@kroening.com
 
 #include "smt2_parser.h"
 
-#include "smt2_format.h"
-
 #include <util/arith_tools.h>
 #include <util/bitvector_expr.h>
 #include <util/bitvector_types.h>
@@ -20,6 +18,9 @@ Author: Daniel Kroening, kroening@kroening.com
 #include <util/prefix.h>
 #include <util/range.h>
 
+#include "smt2_format.h"
+#include "smt2irep.h"
+
 #include <numeric>
 
 smt2_tokenizert::tokent smt2_parsert::next_token()
@@ -121,10 +122,40 @@ void smt2_parsert::ignore_command()
 
 exprt::operandst smt2_parsert::operands()
 {
+  // If our iterative walker (convert_irep_to_exprt) has pre-computed the
+  // operands for the handler about to run, consume them here.
+  if(precollected_operands.has_value())
+  {
+    auto result = std::move(*precollected_operands);
+    precollected_operands.reset();
+    return result;
+  }
+
   exprt::operandst result;
 
   while(smt2_tokenizer.peek() != smt2_tokenizert::CLOSE)
-    result.push_back(expression());
+  {
+    // For each operand, if it starts with '(' we read it via smt2irep into
+    // a generic S-expression irept iteratively, then walk that irept
+    // iteratively to produce the corresponding exprt. This keeps the
+    // parser stack-safe even for operands that are deeply right-nested
+    // function applications such as (bvand x (bvand x (bvand x ...))),
+    // which are common in SMT-COMP QF_ABV benchmarks.
+    //
+    // For atomic operands the existing expression() path is used; it
+    // does not recurse on atoms.
+    if(smt2_tokenizer.peek() == smt2_tokenizert::OPEN)
+    {
+      auto irep_opt = smt2irep(smt2_tokenizer);
+      if(!irep_opt.has_value())
+        throw error("EOF in an operand");
+      result.push_back(convert_irep_to_exprt(*irep_opt));
+    }
+    else
+    {
+      result.push_back(expression());
+    }
+  }
 
   next_token(); // eat the ')'
 
@@ -485,126 +516,134 @@ exprt smt2_parsert::function_application_fp(const exprt::operandst &op)
     fp_type);
 }
 
-exprt smt2_parsert::function_application()
+exprt smt2_parsert::function_application_with_id(const irep_idt &id)
 {
-  switch(next_token())
+  if(id == "_") // indexed identifier
   {
-  case smt2_tokenizert::SYMBOL:
-    if(smt2_tokenizer.get_buffer() == "_") // indexed identifier
-    {
-      // indexed identifier
-      if(next_token() != smt2_tokenizert::SYMBOL)
-        throw error("expected symbol after '_'");
+    // indexed identifier
+    if(next_token() != smt2_tokenizert::SYMBOL)
+      throw error("expected symbol after '_'");
 
-      // copy, the reference won't be stable
-      const auto id = smt2_tokenizer.get_buffer();
+    // copy, the reference won't be stable
+    const auto inner_id = smt2_tokenizer.get_buffer();
 
-      if(has_prefix(id, "bv"))
-      {
-        mp_integer i = string2integer(
-          std::string(smt2_tokenizer.get_buffer(), 2, std::string::npos));
+    if(has_prefix(inner_id, "bv"))
+    {
+      mp_integer i = string2integer(
+        std::string(smt2_tokenizer.get_buffer(), 2, std::string::npos));
 
-        if(next_token() != smt2_tokenizert::NUMERAL)
-          throw error("expected numeral as bitvector literal width");
+      if(next_token() != smt2_tokenizert::NUMERAL)
+        throw error("expected numeral as bitvector literal width");
 
-        auto width = std::stoll(smt2_tokenizer.get_buffer());
+      auto width = std::stoll(smt2_tokenizer.get_buffer());
 
-        if(next_token() != smt2_tokenizert::CLOSE)
-          throw error("expected ')' after bitvector literal");
+      if(next_token() != smt2_tokenizert::CLOSE)
+        throw error("expected ')' after bitvector literal");
 
-        return from_integer(i, unsignedbv_typet(width));
-      }
-      else if(id == "+oo" || id == "-oo" || id == "NaN")
-      {
-        // These are the "plus infinity", "minus infinity" and NaN
-        // floating-point literals.
-        if(next_token() != smt2_tokenizert::NUMERAL)
-          throw error() << "expected number after " << id;
+      return from_integer(i, unsignedbv_typet(width));
+    }
+    else if(inner_id == "+oo" || inner_id == "-oo" || inner_id == "NaN")
+    {
+      // These are the "plus infinity", "minus infinity" and NaN
+      // floating-point literals.
+      if(next_token() != smt2_tokenizert::NUMERAL)
+        throw error() << "expected number after " << inner_id;
 
-        auto width_e = std::stoll(smt2_tokenizer.get_buffer());
+      auto width_e = std::stoll(smt2_tokenizer.get_buffer());
 
-        if(next_token() != smt2_tokenizert::NUMERAL)
-          throw error() << "expected second number after " << id;
+      if(next_token() != smt2_tokenizert::NUMERAL)
+        throw error() << "expected second number after " << inner_id;
 
-        auto width_f = std::stoll(smt2_tokenizer.get_buffer());
+      auto width_f = std::stoll(smt2_tokenizer.get_buffer());
 
-        if(next_token() != smt2_tokenizert::CLOSE)
-          throw error() << "expected ')' after " << id;
+      if(next_token() != smt2_tokenizert::CLOSE)
+        throw error() << "expected ')' after " << inner_id;
 
-        // width_f *includes* the hidden bit
-        const ieee_float_spect spec(width_f - 1, width_e);
+      // width_f *includes* the hidden bit
+      const ieee_float_spect spec(width_f - 1, width_e);
 
-        if(id == "+oo")
-          return ieee_floatt::plus_infinity(spec).to_expr();
-        else if(id == "-oo")
-          return ieee_floatt::minus_infinity(spec).to_expr();
-        else // NaN
-          return ieee_floatt::NaN(spec).to_expr();
-      }
-      else
-      {
-        throw error() << "unknown indexed identifier " << id;
-      }
+      if(inner_id == "+oo")
+        return ieee_floatt::plus_infinity(spec).to_expr();
+      else if(inner_id == "-oo")
+        return ieee_floatt::minus_infinity(spec).to_expr();
+      else // NaN
+        return ieee_floatt::NaN(spec).to_expr();
     }
-    else if(smt2_tokenizer.get_buffer() == "!")
+    else
     {
-      // these are "term attributes"
-      const auto term = expression();
+      throw error() << "unknown indexed identifier " << inner_id;
+    }
+  }
+  else if(id == "!")
+  {
+    // these are "term attributes"
+    const auto term = expression();
 
-      while(smt2_tokenizer.peek() == smt2_tokenizert::KEYWORD)
+    while(smt2_tokenizer.peek() == smt2_tokenizert::KEYWORD)
+    {
+      next_token(); // eat the keyword
+      if(smt2_tokenizer.get_buffer() == "named")
       {
-        next_token(); // eat the keyword
-        if(smt2_tokenizer.get_buffer() == "named")
-        {
-          // 'named terms' must be Boolean
-          if(!term.is_boolean())
-            throw error("named terms must be Boolean");
+        // 'named terms' must be Boolean
+        if(!term.is_boolean())
+          throw error("named terms must be Boolean");
 
-          if(next_token() == smt2_tokenizert::SYMBOL)
-          {
-            const symbol_exprt symbol_expr(
-              smt2_tokenizer.get_buffer(), bool_typet());
-            named_terms.emplace(
-              symbol_expr.identifier(), named_termt(term, symbol_expr));
-          }
-          else
-            throw error("invalid name attribute, expected symbol");
+        if(next_token() == smt2_tokenizert::SYMBOL)
+        {
+          const symbol_exprt symbol_expr(
+            smt2_tokenizer.get_buffer(), bool_typet());
+          named_terms.emplace(
+            symbol_expr.identifier(), named_termt(term, symbol_expr));
         }
         else
-          throw error("unknown term attribute");
+          throw error("invalid name attribute, expected symbol");
       }
-
-      if(next_token() != smt2_tokenizert::CLOSE)
-        throw error("expected ')' at end of term attribute");
       else
-        return term;
+        throw error("unknown term attribute");
     }
+
+    if(next_token() != smt2_tokenizert::CLOSE)
+      throw error("expected ')' at end of term attribute");
     else
-    {
-      // non-indexed symbol, look up in expression table
-      const auto id = smt2_tokenizer.get_buffer();
-      const auto e_it = expressions.find(id);
-      if(e_it != expressions.end())
-        return e_it->second();
+      return term;
+  }
+  else
+  {
+    // non-indexed symbol, look up in expression table
+    const auto e_it = expressions.find(id2string(id));
+    if(e_it != expressions.end())
+      return e_it->second();
 
-      // get the operands
-      auto op = operands();
+    // get the operands
+    auto op = operands();
 
-      // rummage through id_map
-      auto id_it = id_map.find(id);
-      if(id_it != id_map.end())
+    // rummage through id_map
+    auto id_it = id_map.find(id);
+    if(id_it != id_map.end())
+    {
+      if(id_it->second.type.id() == ID_mathematical_function)
       {
-        if(id_it->second.type.id() == ID_mathematical_function)
-        {
-          return function_application(symbol_exprt(id, id_it->second.type), op);
-        }
-        else
-          return symbol_exprt(id, id_it->second.type);
+        return function_application(symbol_exprt(id, id_it->second.type), op);
       }
       else
-        throw error() << "unknown function symbol '" << id << '\'';
+        return symbol_exprt(id, id_it->second.type);
     }
-    break;
+    else
+      throw error() << "unknown function symbol '" << id << '\'';
+  }
+
+  UNREACHABLE;
+}
+
+exprt smt2_parsert::function_application()
+{
+  switch(next_token())
+  {
+  case smt2_tokenizert::SYMBOL:
+  {
+    const auto id = smt2_tokenizer.get_buffer();
+    return function_application_with_id(id);
+  }
 
   case smt2_tokenizert::OPEN: // likely indexed identifier
     if(smt2_tokenizer.peek() == smt2_tokenizert::SYMBOL)
@@ -1008,8 +1047,660 @@ exprt smt2_parsert::bv_mod(const exprt::operandst &operands, bool is_signed)
     if_exprt(divisor_is_zero, dividend, mod_result));
 }
 
+void smt2_parsert::serialize_irept(const irept &ir, std::string &out)
+{
+  if(ir.get_sub().empty())
+  {
+    out += ir.id_string();
+    return;
+  }
+  out += '(';
+  bool first = true;
+  for(const auto &c : ir.get_sub())
+  {
+    if(!first)
+      out += ' ';
+    serialize_irept(c, out);
+    first = false;
+  }
+  out += ')';
+}
+
+exprt smt2_parsert::convert_irept_via_recursive(const irept &ir)
+{
+  // Serialize the irept back to SMT-LIB text and evaluate it via
+  // expression() on a temporarily-swapped tokenizer. This is used as a
+  // fallback for constructs the iterative walker does not implement
+  // (quantifiers, 'as const', indexed identifiers such as to_fp).
+  //
+  // Because these constructs are not deeply right-nested in practice, the
+  // short recursion through expression() does not compromise the stack
+  // safety that motivates the iterative walker.
+  std::string text;
+  serialize_irept(ir, text);
+
+  std::istringstream iss(text);
+  smt2_tokenizert saved{std::move(smt2_tokenizer)};
+  smt2_tokenizer = smt2_tokenizert{iss};
+  exprt result;
+  try
+  {
+    result = expression();
+  }
+  catch(...)
+  {
+    smt2_tokenizer = std::move(saved);
+    throw;
+  }
+  smt2_tokenizer = std::move(saved);
+  return result;
+}
+
+exprt smt2_parsert::convert_irep_to_exprt(const irept &root)
+{
+  // Post-order walk over the S-expression irept using an explicit frame
+  // stack. The existing expressions[] / id_map / function_application_with_id
+  // machinery is reused for semantic translation: for every function
+  // application node we pre-compute the operand exprts and pass them to
+  // the handler via precollected_operands.
+  //
+  // Forms handled here:
+  //   - atoms (numerals, bitvector literals, symbols, booleans)
+  //   - (let ((x1 v1) ...) body)
+  //   - (_ bv... n)  / (_ +oo e f) / (_ -oo e f) / (_ NaN e f)
+  //   - (! term :named foo ...)
+  //   - ((_ extract ...) op) and other indexed-identifier applications
+  //   - ((as const T) v)
+  //   - regular function applications (head is a SYMBOL)
+  //
+  // Quantifiers, lambdas and other unusual forms are not produced by
+  // smt2irep callers in QF_ABV; if encountered, an error is raised.
+
+  enum staget
+  {
+    S_START,
+    S_CHILDREN_DONE,
+    S_LET_BINDINGS_DONE,
+    S_LET_BODY_DONE
+  };
+
+  struct framet
+  {
+    const irept *node;
+    staget stage = S_START;
+    // For let scope management:
+    std::vector<std::pair<irep_idt, idt>> saved_ids;
+    std::vector<std::pair<irep_idt, exprt>> bindings;
+  };
+
+  std::vector<framet> frames;
+  std::vector<exprt> results;
+  frames.push_back({&root});
+
+  auto classify_atom = [this](const std::string &buffer) -> exprt
+  {
+    if(buffer.size() >= 2 && buffer[0] == '#' && buffer[1] == 'x')
+    {
+      mp_integer value =
+        string2integer(std::string(buffer, 2, std::string::npos), 16);
+      const std::size_t width = 4 * (buffer.size() - 2);
+      CHECK_RETURN(width != 0 && width % 4 == 0);
+      return from_integer(value, unsignedbv_typet(width));
+    }
+    if(buffer.size() >= 2 && buffer[0] == '#' && buffer[1] == 'b')
+    {
+      mp_integer value =
+        string2integer(std::string(buffer, 2, std::string::npos), 2);
+      const std::size_t width = buffer.size() - 2;
+      CHECK_RETURN(width != 0);
+      return from_integer(value, unsignedbv_typet(width));
+    }
+    // A decimal numeral consists entirely of digits (optionally with a
+    // single '.' for reals). Note that SMT-LIB symbols are permitted to
+    // start with '.' (e.g. '.cse28' in let bindings emitted by Z3), so
+    // first character alone is not enough to classify.
+    auto looks_like_numeral = [&buffer]
+    {
+      if(buffer.empty())
+        return false;
+      bool seen_digit = false;
+      for(char ch : buffer)
+      {
+        if(isdigit(static_cast<unsigned char>(ch)))
+          seen_digit = true;
+        else if(ch != '.')
+          return false;
+      }
+      return seen_digit;
+    };
+    if(looks_like_numeral())
+      return constant_exprt(buffer, integer_typet());
+    // Otherwise assume SYMBOL: look up in expressions[] (covers true/false,
+    // rounding modes, ...) and then in id_map.
+    const auto e_it = expressions.find(buffer);
+    if(e_it != expressions.end())
+      return e_it->second();
+    auto id_it = id_map.find(buffer);
+    if(id_it != id_map.end())
+      return symbol_exprt(buffer, id_it->second.type);
+    throw error() << "unknown expression '" << buffer << '\'';
+  };
+
+  auto is_leaf = [](const irept &ir) { return ir.get_sub().empty(); };
+
+  while(!frames.empty())
+  {
+    framet &top = frames.back();
+    const irept &n = *top.node;
+
+    if(top.stage == S_START)
+    {
+      if(is_leaf(n))
+      {
+        results.push_back(classify_atom(n.id_string()));
+        frames.pop_back();
+        continue;
+      }
+
+      if(n.get_sub().empty())
+        throw error("empty s-expression");
+
+      const irept &head = n.get_sub().front();
+
+      if(is_leaf(head))
+      {
+        const std::string &head_id = head.id_string();
+
+        if(head_id == "let")
+        {
+          if(n.get_sub().size() != 3)
+            throw error("malformed let expression");
+          const irept &bindings = n.get_sub()[1];
+          top.stage = S_LET_BINDINGS_DONE;
+          // Queue all binding values in reverse so they resolve left-to-right.
+          for(auto it = bindings.get_sub().rbegin();
+              it != bindings.get_sub().rend();
+              ++it)
+          {
+            if(it->get_sub().size() != 2)
+              throw error("malformed let binding");
+            frames.push_back({&it->get_sub()[1]});
+          }
+          continue;
+        }
+
+        if(head_id == "_")
+        {
+          // (_ bv... N) or (_ +oo e f) etc. — no sub-expressions to convert.
+          if(n.get_sub().size() < 3)
+            throw error("malformed indexed identifier");
+          const std::string &inner = n.get_sub()[1].id_string();
+          if(has_prefix(inner, "bv"))
+          {
+            mp_integer i =
+              string2integer(std::string(inner, 2, std::string::npos));
+            auto width_s = n.get_sub()[2].id_string();
+            auto width = std::stoll(width_s);
+            results.push_back(from_integer(i, unsignedbv_typet(width)));
+            frames.pop_back();
+            continue;
+          }
+          if(inner == "+oo" || inner == "-oo" || inner == "NaN")
+          {
+            if(n.get_sub().size() != 4)
+              throw error() << "malformed " << inner;
+            auto width_e = std::stoll(n.get_sub()[2].id_string());
+            auto width_f = std::stoll(n.get_sub()[3].id_string());
+            const ieee_float_spect spec(width_f - 1, width_e);
+            if(inner == "+oo")
+              results.push_back(ieee_floatt::plus_infinity(spec).to_expr());
+            else if(inner == "-oo")
+              results.push_back(ieee_floatt::minus_infinity(spec).to_expr());
+            else
+              results.push_back(ieee_floatt::NaN(spec).to_expr());
+            frames.pop_back();
+            continue;
+          }
+          throw error() << "unknown indexed identifier " << inner;
+        }
+
+        if(head_id == "!")
+        {
+          // (! term :named foo ...) — evaluate term, then process attributes
+          if(n.get_sub().size() < 2)
+            throw error("malformed term attribute");
+          top.stage = S_CHILDREN_DONE;
+          frames.push_back({&n.get_sub()[1]}); // the term
+          continue;
+        }
+
+        if(head_id == "forall" || head_id == "exists" || head_id == "lambda")
+        {
+          // Quantifiers and lambdas introduce bound variables with typed
+          // sorts. Rather than re-implementing the binding machinery in
+          // the iterative walker, fall back to the recursive expression()
+          // path via serialize-and-swap. Quantifier bodies are not deeply
+          // right-nested in practice.
+          results.push_back(convert_irept_via_recursive(n));
+          frames.pop_back();
+          continue;
+        }
+
+        // Regular function application: queue all operand children.
+        top.stage = S_CHILDREN_DONE;
+        for(std::size_t i = n.get_sub().size(); i-- > 1;)
+          frames.push_back({&n.get_sub()[i]});
+        continue;
+      }
+
+      // head is itself an interior node — ((_ extract ...) op) etc.
+      const irept &head_head = head.get_sub().front();
+
+      // Filter out heads that the S_CHILDREN_DONE stage does not
+      // implement (`((as const T) v)`, `((_ to_fp ...) op)` and its
+      // unsigned variant). These are handled by the fallback to the
+      // recursive expression() path instead, so do NOT queue children
+      // here — the fallback will re-parse from the SMT-LIB text and
+      // manage its own operand evaluation.
+      auto indexed_is_handled = [](const std::string &id)
+      {
+        return id == "extract" || id == "rotate_left" || id == "rotate_right" ||
+               id == "repeat" || id == "sign_extend" || id == "zero_extend" ||
+               id == "fp.to_sbv" || id == "fp.to_ubv";
+      };
+      const bool fallback =
+        is_leaf(head_head) &&
+        ((head_head.id_string() == "_" && head.get_sub().size() >= 2 &&
+          !indexed_is_handled(head.get_sub()[1].id_string())) ||
+         head_head.id_string() == "as");
+      if(fallback)
+      {
+        results.push_back(convert_irept_via_recursive(n));
+        frames.pop_back();
+        continue;
+      }
+
+      if(
+        is_leaf(head_head) &&
+        (head_head.id_string() == "_" || head_head.id_string() == "as"))
+      {
+        // Queue operands (arguments to the indexed identifier / as-const).
+        top.stage = S_CHILDREN_DONE;
+        for(std::size_t i = n.get_sub().size(); i-- > 1;)
+          frames.push_back({&n.get_sub()[i]});
+        continue;
+      }
+
+      throw error("unsupported s-expression head");
+    }
+
+    if(top.stage == S_CHILDREN_DONE)
+    {
+      const irept &head = n.get_sub().front();
+
+      if(is_leaf(head))
+      {
+        const irep_idt head_id = head.id_string();
+
+        if(head_id == "!")
+        {
+          // Pop the term from the result stack.
+          exprt term = std::move(results.back());
+          results.pop_back();
+          // Process :named attribute pairs, matching the token-based
+          // implementation in function_application_with_id(). Other
+          // attributes are not supported here.
+          for(std::size_t i = 2; i < n.get_sub().size();)
+          {
+            const std::string &kw = n.get_sub()[i].id_string();
+            if(kw == ":named")
+            {
+              if(i + 1 >= n.get_sub().size())
+                throw error("expected value after :named");
+              if(!term.is_boolean())
+                throw error("named terms must be Boolean");
+              const std::string &name = n.get_sub()[i + 1].id_string();
+              symbol_exprt symbol_expr(name, bool_typet());
+              named_terms.emplace(
+                symbol_expr.identifier(), named_termt(term, symbol_expr));
+              i += 2;
+            }
+            else
+              throw error("unknown term attribute");
+          }
+          results.push_back(std::move(term));
+          frames.pop_back();
+          continue;
+        }
+
+        // Regular function application: pop operands, dispatch.
+        const std::size_t nops = n.get_sub().size() - 1;
+        exprt::operandst ops(nops);
+        for(std::size_t i = nops; i-- > 0;)
+        {
+          ops[i] = std::move(results.back());
+          results.pop_back();
+        }
+
+        // The handler table expects operands via operands(); we make them
+        // available through precollected_operands.
+        precollected_operands = std::move(ops);
+        try
+        {
+          results.push_back(function_application_with_id(head_id));
+        }
+        catch(...)
+        {
+          precollected_operands.reset();
+          throw;
+        }
+        precollected_operands.reset();
+        frames.pop_back();
+        continue;
+      }
+
+      // head is a complex sub-expression — ((_ extract ...) op) or
+      // ((as const T) v). Pop operands first.
+      const std::size_t nops = n.get_sub().size() - 1;
+      exprt::operandst ops(nops);
+      for(std::size_t i = nops; i-- > 0;)
+      {
+        ops[i] = std::move(results.back());
+        results.pop_back();
+      }
+
+      const irept &head_head = head.get_sub().front();
+      if(is_leaf(head_head) && head_head.id_string() == "_")
+      {
+        // ((_ <name> <index>+) <op>+)
+        if(head.get_sub().size() < 2)
+          throw error("malformed indexed identifier");
+        const irep_idt id = head.get_sub()[1].id_string();
+
+        if(id == "extract")
+        {
+          if(head.get_sub().size() != 4 || ops.size() != 1)
+            throw error("extract takes two indices and one operand");
+          auto upper = std::stoll(head.get_sub()[2].id_string());
+          auto lower = std::stoll(head.get_sub()[3].id_string());
+          if(upper < lower)
+            throw error("extract got bad indices");
+          auto lower_e = from_integer(lower, integer_typet());
+          unsignedbv_typet t(upper - lower + 1);
+          results.push_back(extractbits_exprt(ops[0], lower_e, t));
+          frames.pop_back();
+          continue;
+        }
+
+        if(
+          id == "rotate_left" || id == "rotate_right" || id == ID_repeat ||
+          id == "sign_extend" || id == ID_zero_extend)
+        {
+          if(head.get_sub().size() != 3 || ops.size() != 1)
+            throw error() << id << " takes one index and one operand";
+          auto index = string2integer(head.get_sub()[2].id_string());
+          if(id == "rotate_left")
+          {
+            auto dist = from_integer(index, integer_typet());
+            results.push_back(
+              binary_exprt(ops[0], ID_rol, dist, ops[0].type()));
+          }
+          else if(id == "rotate_right")
+          {
+            auto dist = from_integer(index, integer_typet());
+            results.push_back(
+              binary_exprt(ops[0], ID_ror, dist, ops[0].type()));
+          }
+          else if(id == "sign_extend")
+          {
+            const auto width = to_unsignedbv_type(ops[0].type()).get_width();
+            const signedbv_typet small_signed_type{width};
+            const signedbv_typet large_signed_type{width + index};
+            const unsignedbv_typet unsigned_type{width + index};
+            results.push_back(typecast_exprt(
+              typecast_exprt(
+                typecast_exprt(ops[0], small_signed_type), large_signed_type),
+              unsigned_type));
+          }
+          else if(id == ID_zero_extend)
+          {
+            auto width = to_unsignedbv_type(ops[0].type()).get_width();
+            unsignedbv_typet unsigned_type{width + index};
+            results.push_back(zero_extend_exprt{ops[0], unsigned_type});
+          }
+          else
+          {
+            auto i = from_integer(index, integer_typet());
+            auto width = to_unsignedbv_type(ops[0].type()).get_width() * index;
+            results.push_back(
+              replication_exprt(i, ops[0], unsignedbv_typet(width)));
+          }
+          frames.pop_back();
+          continue;
+        }
+
+        if(id == "fp.to_sbv" || id == "fp.to_ubv")
+        {
+          if(head.get_sub().size() != 3 || ops.size() != 2)
+            throw error() << id << " takes one index and two operands";
+          auto width = std::stoll(head.get_sub()[2].id_string());
+          if(ops[1].type().id() != ID_floatbv)
+            throw error() << id << " takes a FloatingPoint operand";
+          if(id == "fp.to_sbv")
+            results.push_back(typecast_exprt(
+              floatbv_typecast_exprt(ops[1], ops[0], signedbv_typet(width)),
+              unsignedbv_typet(width)));
+          else
+            results.push_back(
+              floatbv_typecast_exprt(ops[1], ops[0], unsignedbv_typet(width)));
+          frames.pop_back();
+          continue;
+        }
+
+        // For `to_fp` / `to_fp_unsigned` the existing implementation
+        // depends on whether the source operand is real, integer, bitvector
+        // or floating-point, and in the real-or-integer case on the
+        // constant representation. This is handled via the S_START
+        // fallback to the recursive expression() path.
+        UNREACHABLE;
+      }
+
+      if(is_leaf(head_head) && head_head.id_string() == "as")
+      {
+        // ((as const T) v) — handled via the S_START fallback.
+        UNREACHABLE;
+      }
+
+      throw error("unsupported s-expression head in stage S_CHILDREN_DONE");
+    }
+
+    if(top.stage == S_LET_BINDINGS_DONE)
+    {
+      // All binding values have been evaluated. The queueing step pushed
+      // the bindings right-to-left, so the bindings were processed
+      // left-to-right (LIFO). This means the TOP of results is the
+      // rightmost binding's value, and the oldest entry on results is
+      // the leftmost binding's value.
+      const irept &bindings = n.get_sub()[1];
+      const std::size_t nb = bindings.get_sub().size();
+
+      top.bindings.resize(nb);
+      for(std::size_t i = 0; i < nb; i++)
+      {
+        top.bindings[i].first = bindings.get_sub()[i].get_sub()[0].id_string();
+      }
+      // Pop values in reverse order: top of results is bindings[nb-1].
+      for(std::size_t i = nb; i-- > 0;)
+      {
+        top.bindings[i].second = std::move(results.back());
+        results.pop_back();
+      }
+
+      // Install bindings in id_map; record shadows for restoration.
+      for(const auto &b : top.bindings)
+      {
+        auto ins = id_map.insert({b.first, idt{idt::BINDING, b.second}});
+        if(!ins.second)
+        {
+          top.saved_ids.emplace_back(
+            ins.first->first, std::move(ins.first->second));
+          ins.first->second = idt{idt::BINDING, b.second};
+        }
+      }
+
+      top.stage = S_LET_BODY_DONE;
+      frames.push_back({&n.get_sub()[2]}); // body
+      continue;
+    }
+
+    if(top.stage == S_LET_BODY_DONE)
+    {
+      exprt body = std::move(results.back());
+      results.pop_back();
+
+      binding_exprt::variablest variables;
+      exprt::operandst values;
+      variables.reserve(top.bindings.size());
+      values.reserve(top.bindings.size());
+      for(const auto &b : top.bindings)
+      {
+        variables.emplace_back(b.first, b.second.type());
+        values.push_back(b.second);
+      }
+
+      for(const auto &b : top.bindings)
+        id_map.erase(b.first);
+      for(auto &s : top.saved_ids)
+        id_map.insert(std::move(s));
+
+      results.push_back(
+        let_exprt(std::move(variables), std::move(values), std::move(body)));
+      frames.pop_back();
+      continue;
+    }
+
+    UNREACHABLE;
+  }
+
+  POSTCONDITION(results.size() == 1);
+  return std::move(results.front());
+}
+
 exprt smt2_parsert::expression()
 {
+  // Deeply nested (let ((x v)) (let ((y w)) ...)) expressions — common in
+  // SMT-COMP benchmarks — would otherwise descend recursively once per
+  // nested let and overflow the call stack. Collect such nested lets on an
+  // explicit frame stack first, then parse the innermost non-let body, and
+  // finally walk the frame stack back out to build the let_exprt chain.
+  //
+  // Binding values and the innermost body are still parsed recursively; a
+  // later change breaks recursion for those too.
+  struct let_framet
+  {
+    std::vector<std::pair<irep_idt, exprt>> bindings;
+    std::vector<std::pair<irep_idt, idt>> saved_ids;
+  };
+  std::vector<let_framet> let_stack;
+
+  auto apply_let_frames = [&](exprt body) -> exprt
+  {
+    for(auto it = let_stack.rbegin(); it != let_stack.rend(); ++it)
+    {
+      if(next_token() != smt2_tokenizert::CLOSE)
+        throw error("expected ')' after let");
+
+      binding_exprt::variablest variables;
+      exprt::operandst values;
+      variables.reserve(it->bindings.size());
+      values.reserve(it->bindings.size());
+      for(const auto &b : it->bindings)
+      {
+        variables.emplace_back(b.first, b.second.type());
+        values.push_back(b.second);
+      }
+
+      for(const auto &b : it->bindings)
+        id_map.erase(b.first);
+      for(auto &saved : it->saved_ids)
+        id_map.insert(std::move(saved));
+
+      body =
+        let_exprt(std::move(variables), std::move(values), std::move(body));
+    }
+    return body;
+  };
+
+  while(smt2_tokenizer.peek() == smt2_tokenizert::OPEN)
+  {
+    next_token(); // consume '('
+
+    if(smt2_tokenizer.peek() != smt2_tokenizert::SYMBOL)
+    {
+      // '(' not followed by SYMBOL — this is a nested function application
+      // such as ((_ extract 3 0) op) or bare double parentheses. Let the
+      // existing function_application() helper consume the head token and
+      // dispatch. It expects the outer '(' to already be consumed, which
+      // matches our state here.
+      return apply_let_frames(function_application());
+    }
+
+    next_token(); // consume the head SYMBOL
+    const auto id = smt2_tokenizer.get_buffer();
+
+    if(id != "let")
+    {
+      // Not a let — dispatch the function application using the already
+      // consumed head symbol.
+      return apply_let_frames(function_application_with_id(id));
+    }
+
+    // It is a let — parse the bindings and push a frame.
+    let_framet frame;
+
+    if(next_token() != smt2_tokenizert::OPEN)
+      throw error("expected bindings after let");
+
+    while(smt2_tokenizer.peek() == smt2_tokenizert::OPEN)
+    {
+      next_token(); // consume '('
+
+      if(next_token() != smt2_tokenizert::SYMBOL)
+        throw error("expected symbol in binding");
+
+      irep_idt bind_id = smt2_tokenizer.get_buffer();
+
+      // note that the previous bindings are _not_ visible yet
+      exprt value = expression();
+
+      if(next_token() != smt2_tokenizert::CLOSE)
+        throw error("expected ')' after value in binding");
+
+      frame.bindings.emplace_back(bind_id, std::move(value));
+    }
+
+    if(next_token() != smt2_tokenizert::CLOSE)
+      throw error("expected ')' at end of bindings");
+
+    // add the bindings to id_map so that they are visible for the body
+    for(const auto &b : frame.bindings)
+    {
+      auto insert_result =
+        id_map.insert({b.first, idt{idt::BINDING, b.second}});
+      if(!insert_result.second) // already there
+      {
+        auto &id_entry = *insert_result.first;
+        frame.saved_ids.emplace_back(
+          id_entry.first, std::move(id_entry.second));
+        id_entry.second = idt{idt::BINDING, b.second};
+      }
+    }
+
+    let_stack.push_back(std::move(frame));
+    // loop back to check whether the body of this let is itself a let
+  }
+
+  // The next token is not '(' — parse an atom.
   switch(next_token())
   {
   case smt2_tokenizert::SYMBOL:
@@ -1019,7 +1710,7 @@ exprt smt2_parsert::expression()
       // in the expression table?
       const auto e_it = expressions.find(identifier);
       if(e_it != expressions.end())
-        return e_it->second();
+      return apply_let_frames(e_it->second());
 
       // rummage through id_map
       auto id_it = id_map.find(identifier);
@@ -1028,7 +1719,7 @@ exprt smt2_parsert::expression()
         symbol_exprt symbol_expr(identifier, id_it->second.type);
         if(smt2_tokenizer.token_is_quoted_symbol())
           symbol_expr.set(ID_C_quoted, true);
-        return std::move(symbol_expr);
+        return apply_let_frames(std::move(symbol_expr));
       }
 
       // don't know, give up
@@ -1045,7 +1736,7 @@ exprt smt2_parsert::expression()
       const std::size_t width = 4 * (buffer.size() - 2);
       CHECK_RETURN(width != 0 && width % 4 == 0);
       unsignedbv_typet type(width);
-      return from_integer(value, type);
+      return apply_let_frames(from_integer(value, type));
     }
     else if(buffer.size() >= 2 && buffer[0] == '#' && buffer[1] == 'b')
     {
@@ -1054,20 +1745,18 @@ exprt smt2_parsert::expression()
       const std::size_t width = buffer.size() - 2;
       CHECK_RETURN(width != 0);
       unsignedbv_typet type(width);
-      return from_integer(value, type);
+      return apply_let_frames(from_integer(value, type));
     }
     else
     {
-      return constant_exprt(buffer, integer_typet());
+      return apply_let_frames(constant_exprt(buffer, integer_typet()));
     }
   }
 
-  case smt2_tokenizert::OPEN: // function application
-    return function_application();
-
   case smt2_tokenizert::END_OF_FILE:
     throw error("EOF in an expression");
 
+  case smt2_tokenizert::OPEN:
   case smt2_tokenizert::CLOSE:
   case smt2_tokenizert::STRING_LITERAL:
   case smt2_tokenizert::NONE:
diff --git a/src/solvers/smt2/smt2_parser.h b/src/solvers/smt2/smt2_parser.h
index cc923e6b67e..36b3a218226 100644
--- a/src/solvers/smt2/smt2_parser.h
+++ b/src/solvers/smt2/smt2_parser.h
@@ -9,14 +9,17 @@ Author: Daniel Kroening, kroening@kroening.com
 #ifndef CPROVER_SOLVERS_SMT2_SMT2_PARSER_H
 #define CPROVER_SOLVERS_SMT2_SMT2_PARSER_H
 
-#include <map>
-#include <unordered_map>
-
 #include <util/mathematical_types.h>
 #include <util/std_expr.h>
 
 #include "smt2_tokenizer.h"
 
+#include <map>
+#include <optional>
+#include <unordered_map>
+
+class irept;
+
 class smt2_parsert
 {
 public:
@@ -150,12 +153,41 @@ class smt2_parsert
   void setup_expressions();
   exprt expression();
   exprt function_application();
+  exprt function_application_with_id(const irep_idt &id);
   exprt function_application_ieee_float_op(
     const irep_idt &,
     const exprt::operandst &);
   exprt function_application_ieee_float_eq(const exprt::operandst &);
   exprt function_application_fp(const exprt::operandst &);
   exprt::operandst operands();
+
+  /// When set, the next call to operands() takes these as its result rather
+  /// than reading further from the tokenizer. Used by the iterative
+  /// walker in convert_irep_to_exprt() to feed pre-computed operand
+  /// exprts to the expressions[] / id_map dispatch logic in
+  /// function_application_with_id().
+  std::optional<exprt::operandst> precollected_operands;
+
+  /// Convert a generic S-expression irept (as produced by smt2irep())
+  /// into the corresponding exprt without using the C++ call stack for
+  /// tree traversal: both operand collection and nested 'let' scoping are
+  /// driven by an explicit work-list of frames. For simple function
+  /// applications the existing tokenizer-based machinery is reused by
+  /// dispatching through function_application_with_id() with
+  /// precollected_operands populated from the walk's result stack.
+  exprt convert_irep_to_exprt(const irept &);
+
+  /// Append the SMT-LIB text form of \p ir to \p out, using the same
+  /// conventions as smt2irep(): leaves are emitted verbatim, interior
+  /// nodes are wrapped in parentheses with children space-separated.
+  static void serialize_irept(const irept &ir, std::string &out);
+
+  /// Fallback used by convert_irep_to_exprt(): serialize \p ir back to
+  /// SMT-LIB text, temporarily redirect the parser's tokenizer to that
+  /// text, and evaluate via expression(). Used for constructs that the
+  /// iterative walker does not implement directly (quantifiers, 'as const',
+  /// indexed identifiers such as to_fp).
+  exprt convert_irept_via_recursive(const irept &ir);
   typet function_signature_declaration();
   signature_with_parameter_idst function_signature_definition();
   void check_matching_operand_types(const exprt::operandst &) const;
diff --git a/src/solvers/smt2/smt2_solver.cpp b/src/solvers/smt2/smt2_solver.cpp
index 9d0652f7989..50e18170add 100644
--- a/src/solvers/smt2/smt2_solver.cpp
+++ b/src/solvers/smt2/smt2_solver.cpp
@@ -73,46 +73,73 @@ void smt2_solvert::define_constants()
 
 void smt2_solvert::expand_function_applications(exprt &expr)
 {
-  for(exprt &op : expr.operands())
-    expand_function_applications(op);
-
-  if(expr.id()==ID_function_application)
+  // Post-order walk, but iterative: the recursive form would overflow the
+  // call stack on deeply-nested expressions produced by the parser (e.g.
+  // chains of thousands of bvand / store operations in SMT-COMP QF_ABV
+  // benchmarks). We do the rewrite in two passes over an explicit stack
+  // of exprt pointers: first collect every node in post-order, then
+  // process them bottom-up. Each node's operands have already been
+  // rewritten by the time we get to it, matching the old recursive
+  // semantics.
+  std::vector<exprt *> post_order;
   {
-    auto &app=to_function_application_expr(expr);
-
-    if(app.function().id() == ID_symbol)
+    std::vector<exprt *> work;
+    work.push_back(&expr);
+    while(!work.empty())
     {
-      // look up the symbol
-      auto identifier = to_symbol_expr(app.function()).identifier();
-      auto f_it = id_map.find(identifier);
+      exprt *cur = work.back();
+      work.pop_back();
+      post_order.push_back(cur);
+      for(exprt &op : cur->operands())
+        work.push_back(&op);
+    }
+  }
+  // post_order now has the root first and leaves last; reverse-iterate
+  // to process leaves before their ancestors.
+  for(auto it = post_order.rbegin(); it != post_order.rend(); ++it)
+  {
+    exprt &e = **it;
+    if(e.id() != ID_function_application)
+      continue;
 
-      if(f_it != id_map.end())
-      {
-        const auto &f = f_it->second;
+    auto &app = to_function_application_expr(e);
 
-        DATA_INVARIANT(
-          f.type.id() == ID_mathematical_function,
-          "type of function symbol must be mathematical_function_type");
+    if(app.function().id() != ID_symbol)
+      continue;
 
-        const auto &domain = to_mathematical_function_type(f.type).domain();
+    // look up the symbol
+    auto identifier = to_symbol_expr(app.function()).identifier();
+    auto f_it = id_map.find(identifier);
 
-        DATA_INVARIANT(
-          domain.size() == app.arguments().size(),
-          "number of parameters must match number of arguments");
+    if(f_it == id_map.end())
+      continue;
 
-        // Does it have a definition? It's otherwise uninterpreted.
-        if(!f.definition.is_nil())
-        {
-          exprt body = f.definition;
+    const auto &f = f_it->second;
 
-          if(body.id() == ID_lambda)
-            body = to_lambda_expr(body).application(app.arguments());
+    DATA_INVARIANT(
+      f.type.id() == ID_mathematical_function,
+      "type of function symbol must be mathematical_function_type");
 
-          expand_function_applications(body); // rec. call
-          expr = body;
-        }
-      }
-    }
+    const auto &domain = to_mathematical_function_type(f.type).domain();
+
+    DATA_INVARIANT(
+      domain.size() == app.arguments().size(),
+      "number of parameters must match number of arguments");
+
+    // Does it have a definition? It's otherwise uninterpreted.
+    if(f.definition.is_nil())
+      continue;
+
+    exprt body = f.definition;
+
+    if(body.id() == ID_lambda)
+      body = to_lambda_expr(body).application(app.arguments());
+
+    // The body may itself contain function applications that need
+    // expanding. It has not been part of our walk, so recurse here.
+    // Bodies are typically shallow — this is the pre-existing behaviour.
+    expand_function_applications(body);
+    e = body;
   }
 }
 
diff --git a/src/solvers/smt2/smt2irep.cpp b/src/solvers/smt2/smt2irep.cpp
index 9eeeb58921a..a3277f3da77 100644
--- a/src/solvers/smt2/smt2irep.cpp
+++ b/src/solvers/smt2/smt2irep.cpp
@@ -14,74 +14,82 @@ Author: Daniel Kroening, kroening@kroening.com
 
 #include "smt2_tokenizer.h"
 
-class smt2irept:public smt2_tokenizert
+class smt2irept
 {
 public:
-  smt2irept(std::istream &_in, message_handlert &message_handler)
-    : smt2_tokenizert(_in), log(message_handler)
+  explicit smt2irept(smt2_tokenizert &_tokenizer)
+    : tokenizer(_tokenizer)
   {
   }
 
   std::optional<irept> operator()();
 
 protected:
-  messaget log;
+  smt2_tokenizert &tokenizer;
 };
 
 std::optional<irept> smt2irept::operator()()
 {
-  try
-  {
-    std::stack<irept> stack;
+  std::stack<irept> stack;
 
-    while(true)
+  while(true)
+  {
+    switch(tokenizer.next_token())
     {
-      switch(next_token())
+    case smt2_tokenizert::END_OF_FILE:
+      if(stack.empty())
+        return {};
+      else
+        throw tokenizer.error("unexpected end of file");
+
+    case smt2_tokenizert::STRING_LITERAL:
+    case smt2_tokenizert::NUMERAL:
+    case smt2_tokenizert::SYMBOL:
+      if(stack.empty())
+        return irept(tokenizer.get_buffer()); // all done!
+      else
+        stack.top().get_sub().push_back(irept(tokenizer.get_buffer()));
+      break;
+
+    case smt2_tokenizert::OPEN: // '('
+      // produce sub-irep
+      stack.push(irept());
+      break;
+
+    case smt2_tokenizert::CLOSE: // ')'
+      // done with sub-irep
+      if(stack.empty())
+        throw tokenizer.error("unexpected ')'");
+      else
       {
-      case END_OF_FILE:
-        if(stack.empty())
-          return {};
-        else
-          throw error("unexpected end of file");
+        irept tmp = stack.top();
+        stack.pop();
 
-      case STRING_LITERAL:
-      case NUMERAL:
-      case SYMBOL:
         if(stack.empty())
-          return irept(buffer); // all done!
-        else
-          stack.top().get_sub().push_back(irept(buffer));
-        break;
+          return tmp; // all done!
 
-      case OPEN: // '('
-        // produce sub-irep
-        stack.push(irept());
+        stack.top().get_sub().push_back(tmp);
         break;
-
-      case CLOSE: // ')'
-        // done with sub-irep
-        if(stack.empty())
-          throw error("unexpected ')'");
-        else
-        {
-          irept tmp = stack.top();
-          stack.pop();
-
-          if(stack.empty())
-            return tmp; // all done!
-
-          stack.top().get_sub().push_back(tmp);
-          break;
-        }
-
-      case NONE:
-      case KEYWORD:
-        throw error("unexpected token");
       }
+
+    case smt2_tokenizert::NONE:
+    case smt2_tokenizert::KEYWORD:
+      throw tokenizer.error("unexpected token");
     }
   }
-  catch(const smt2_errort &e)
+}
+
+std::optional<irept>
+smt2irep(std::istream &in, message_handlert &message_handler)
+{
+  try
+  {
+    smt2_tokenizert tokenizer{in};
+    return smt2irept{tokenizer}();
+  }
+  catch(const smt2_tokenizert::smt2_errort &e)
   {
+    messaget log{message_handler};
     log.error().source_location.set_line(e.get_line_no());
     log.error() << e.what() << messaget::eom;
     return {};
@@ -89,7 +97,7 @@ std::optional<irept> smt2irept::operator()()
 }
 
 std::optional<irept>
-smt2irep(std::istream &in, message_handlert &message_handler)
+smt2irep(smt2_tokenizert &tokenizer)
 {
-  return smt2irept(in, message_handler)();
+  return smt2irept{tokenizer}();
 }
diff --git a/src/solvers/smt2/smt2irep.h b/src/solvers/smt2/smt2irep.h
index bc2a03748c3..c402f1b5f7d 100644
--- a/src/solvers/smt2/smt2irep.h
+++ b/src/solvers/smt2/smt2irep.h
@@ -16,8 +16,16 @@ Author: Daniel Kroening, kroening@kroening.com
 class irept;
 class message_handlert;
 
-/// returns an irep for an SMT-LIB2 expression read from a given stream
-/// returns {} when EOF is encountered before reading non-whitespace input
+/// Returns an irep for an SMT-LIB2 expression read from a given stream
+/// Returns {} when EOF is encountered before reading non-whitespace input
+/// or on other parsing errors.
 std::optional<irept> smt2irep(std::istream &, message_handlert &);
 
+class smt2_tokenizert;
+
+/// Returns an irep for an SMT-LIB2 expression read from a given tokenizer.
+/// Returns {} when EOF is encountered before reading non-whitespace input.
+/// Throws smt2_errort on parsing errors.
+std::optional<irept> smt2irep(smt2_tokenizert &);
+
 #endif // CPROVER_SOLVERS_SMT2_SMT2IREP_H