================
@@ -16701,6 +16701,19 @@ template <typename Derived>
ExprResult TreeTransform<Derived>::TransformSubstNonTypeTemplateParmExpr(
SubstNonTypeTemplateParmExpr *E) {
Expr *OrigReplacement = E->getReplacement()->IgnoreImplicitAsWritten();
+
+ // Insert a constant-evaluated context for the transform.
+ // Otherwise, when a normalized constraint places the replacement inside
+ // an unevaluated operand (e.g. decltype), entities it refers to are not
+ // odr-used, and the constant evaluation performed by CheckTemplateArgument
+ // below can spuriously fail for otherwise valid replacements,
+ // e.g. when a call materializes a function parameter of class type whose
+ // special members were never instantiated.
+ EnterExpressionEvaluationContext ConstantEvaluated(
+ SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated,
+ /*LambdaContextDecl=*/nullptr,
+ Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
----------------
wx257osn2 wrote:
So we should be passing `E->getParameter()` instead of
`Sema::ReuseLambdaContextDecl`, right?
https://github.com/llvm/llvm-project/pull/196791
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