================
@@ -5004,6 +5004,20 @@ static bool CheckDeducedPlaceholderConstraints(Sema &S,
const AutoType &Type,
return true;
MultiLevelTemplateArgumentList MLTAL(Concept, CanonicalConverted,
/*Final=*/false);
+ // Build up an EvaluationContext with an ImplicitConceptSpecializationDecl so
+ // that the template arguments of the constraint can be preserved. For
+ // example:
+ //
+ // template <class T>
+ // concept C = []<D U = void>() { return true; }();
+ //
+ // We need the argument for T while evaluating type constraint D in
+ // building the CallExpr to the lambda.
+ EnterExpressionEvaluationContext EECtx(
+ S, Sema::ExpressionEvaluationContext::ConstantEvaluated,
----------------
erichkeane wrote:
I think Corentin is right. And that link from SemaTemplate might actually be
wrong too, but I'm not completely sure. Though I would have expected us to see
a bunch of bugs for evaluating that incorreclty.
https://github.com/llvm/llvm-project/pull/93945
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