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add regression test for stack overflow in LSP for Positron #2851 #4198

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add regression test for stack overflow in LSP for Positron #2851 #4198

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13 changes: 13 additions & 0 deletions pyrefly/lib/test/recursive_alias.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -271,6 +271,19 @@ not x
"#,
);

testcase!(
test_cyclic_alias_through_type_parameter_bound,
r#"
# Regression test for #2851: resolving `Y`'s scoped type parameter bound closes
# a cycle through `X`. Using the alias used to make the solver recurse forever.
type X = Y # E: cyclic self-reference in `X`
type Y[T: X] = X # E: cyclic self-reference in `Y`

x: X = 1
not x
"#,
);

testcase!(
test_cyclic_no_base_case,
r#"
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