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

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

This should work
```diff
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp 
b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index f02a295220ef..6b423ce06523 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -5669,7 +5669,7 @@ void Sema::InstantiateFunctionDefinition(SourceLocation 
PointOfInstantiation,
   };
   Function->setDeclarationNameLoc(NameLocPointsToPattern());
 
-  EnterExpressionEvaluationContext EvalContext(
+  EnterExpressionEvaluationContextForFunction EvalContext(
       *this, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
 
   Qualifiers ThisTypeQuals;
```


https://github.com/llvm/llvm-project/pull/153921
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