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[clang] return type not correctly deduced for discarded lambdas #153921

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Merged
merged 3 commits into from
Aug 18, 2025
Merged

[clang] return type not correctly deduced for discarded lambdas #153921

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cee36b9
[clang] return type not correctly deduced for discarded lambdas
ojhunt Aug 16, 2025
1d4875d
Make the correct fix
ojhunt Aug 17, 2025
c9fd81a
Merge branch 'main' into users/ojhunt/PR-153884
ojhunt Aug 17, 2025
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2 changes: 1 addition & 1 deletion clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5669,7 +5669,7 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
};
Function->setDeclarationNameLoc(NameLocPointsToPattern());

EnterExpressionEvaluationContext EvalContext(
EnterExpressionEvaluationContextForFunction EvalContext(
*this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);

Qualifiers ThisTypeQuals;
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16 changes: 16 additions & 0 deletions clang/test/CXX/stmt.stmt/stmt.select/stmt.if/p2.cpp
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Expand Up @@ -239,5 +239,21 @@ void f2() {

}

namespace GH153884 {
bool f1() {
auto f = [](auto) { return true; };
if constexpr (0)
return f(1);
return false;
}
bool f2() {
auto f = [](auto x) { if (x) return 1.5; else return "wat"; };
// expected-error@-1 {{'auto' in return type deduced as 'const char *' here but deduced as 'double' in earlier return statement}}
if constexpr (0)
return f(1);
// expected-note@-1 {{in instantiation of function template specialization 'GH153884::f2()}}
return false;
}
}

#endif