================
@@ -253,6 +254,19 @@ bool Parser::ParseOptionalCXXScopeSpecifier(
if (Type.isNull())
return false;
+ // C++ [cpp23.dcl.dcl-2]:
+ // Previously, T...[n] would declare a pack of function parameters.
+ // T...[n] is now a pack-index-specifier. [...] Valid C++ 2023 code that
+ // declares a pack of parameters without specifying a declarator-id
+ // becomes ill-formed.
+ //
+ // However, we still avoid parsing them as pack expansions because this is
a
+ // rare use case of packs, despite being partway non-conforming, to ensure
+ // semantic consistency given that we have backported this feature.
----------------
cor3ntin wrote:
This comment look inconsistent with what you are doing
https://github.com/llvm/llvm-project/pull/116332
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