backward compatibility with string calls and empty e2 return type

lua/entities/gmod_wire_expression2/base/compiler.lua

@@ -407,7 +407,7 @@
 
 	---@param data { [1]: Token<string>, [2]: Node, [3]: Node, [4]: Node?, [5]: Node } var start stop step block
 	[NodeVariant.For] = function (self, trace, data)
 		local var, start, stop, step = data[1], self:CompileExpr(data[2]), self:CompileExpr(data[3]), data[4] and self:CompileExpr(data[4]) or data[4]
 
 		local block = self:Scope(function(scope)
 			scope.data.loop = true
@@ -586,9 +586,9 @@
 
 					if state.__break__ then
 						state.__break__ = false
 						goto exit
 					elseif state.__return__ then -- Yes this should only be checked if the switch is inside a function, but I don't care enough about the performance of switch case to add another duplicated 30 lines to the file
 						goto exit
 					else -- Fallthrough, run every case until break found.
 						for j = i + 1, ncases do
 							cases[j][2](state)
@@ -1047,9 +1047,9 @@
 									state.GlobalScope[var], state.GlobalScope.vclk[var] = val, true
 
 									if state.GlobalScope.lookup[val] then
 										state.GlobalScope.lookup[val][var] = true
 									else
 										state.GlobalScope.lookup[val] = { [var] = true }
 									end
 								end
 							else
@@ -1832,7 +1832,7 @@
 				local fn = state.funcs[sig] or state.funcs[meta_sig]
 				if fn then -- first check if user defined any functions that match signature
 					local r = state.funcs_ret[sig] or state.funcs_ret[meta_sig]
-					if r ~= ret_type then
+					if r ~= ret_type and not (ret_type == nil or r == "") then
 						state:forceThrow( "Mismatching return types. Got " .. (r or "void") .. ", expected " .. (ret_type or "void"))
 					end
 
@@ -1841,7 +1841,7 @@
 					fn = wire_expression2_funcs[sig] or wire_expression2_funcs[meta_sig]
 					if fn then
 						local r = fn[2]
-						if r ~= ret_type and not (ret_type == nil and r == "") then
+						if r ~= ret_type and not (ret_type == nil or r == "") then
 							state:forceThrow( "Mismatching return types. Got " .. (r or "void") .. ", expected " .. (ret_type or "void"))
 						end
 
@@ -1867,7 +1867,7 @@
 								if fn.attributes.legacy then
 									local largs = { [1] = {}, [nargs + 2] = arg_types }
 									for i = 1, nargs do
 										largs[i + 1] = { [1] = function() return rargs[i] end }
 									end
 									return fn[3](state, largs, arg_types)
 								elseif varsig == "array(...)" then -- Need this since can't enforce compile time argument type restrictions on string calls. Woop. Array creation should not be a function..
@@ -1875,11 +1875,11 @@
 									while i <= #arg_types do
 										local ty = arg_types[i]
 										if BLOCKED_ARRAY_TYPES[ty] then
 											table.remove(rargs, i)
 											table.remove(arg_types, i)
 											state:forceThrow("Cannot use type " .. ty .. " for argument #" .. i .. " in stringcall array creation")
 										else
 											i = i + 1
 										end
 									end
 								end
@@ -1892,7 +1892,7 @@
 								if fn then
 									for _, ty in ipairs(arg_types) do -- Just block them entirely. Current method of finding variadics wouldn't allow a proper solution that works with x<yz> types. Would need to rewrite all of this which I don't think is worth it when already nobody is going to use this functionality.
 										if BLOCKED_ARRAY_TYPES[ty] then
 											state:forceThrow("Cannot pass array into variadic array function")
 										end
 									end