[Clang] Introduce FunctionParmPackDecl for expanded lambda captures #107995
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This patch continues the effort of #86265, fixing another issue involving expanded captures that were not able to held off in the process of the inner lambda's transformation.
Similar to FunctionParmPackExpr, FunctionParmPackDecl is introduced to model expanded parameters (particularly, lambda parameters) in the situation where the expansion shouldn't occur in the subsequent transformation. This node acts as an intermediate Decl and thus should not show up in the eventual AST.
Fixes #18873