================
@@ -1613,8 +1613,8 @@ namespace {
bool TemplateInstantiator::AlreadyTransformed(QualType T) {
if (T.isNull())
return true;
-
- if (T->isInstantiationDependentType() || T->isVariablyModifiedType())
+ if (T->isInstantiationDependentType() || T->isVariablyModifiedType() ||
+ (SemaRef.getLangOpts().CPlusPlus20 && T->isDecltypeType()))
----------------
jcsxky wrote:
> Can you please add the relevant standards-quote here, particularly for the
> C++20 vs pre-C++20 change here?
Sorry, I couldn't get what you mean of relevant standards-quote and I am not
very familiar with cpp standards. I add `SemaRef.getLangOpts().CPlusPlus20`
just because command args contains `-std=c++20` and clang diagnose says 'lambda
expression in an unevaluated operand' and don't retransform `decltype` all the
time(issue only exists in code of cpp20 and later).
https://github.com/llvm/llvm-project/pull/80802
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