[all-commits] [llvm/llvm-project] aacdc6: [Clang] Preserve the ExpandsToEmpty flag in PackIn...

[Younan Zhang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aacdc657fc255b2547bb37ee9bacde2df0452298
      https://github.com/llvm/llvm-project/commit/aacdc657fc255b2547bb37ee9bacde2df0452298
  Author: Younan Zhang <zyn7109 at gmail.com>
  Date:   2024-09-04 (Wed, 04 Sep 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/AST/Type.h
    M clang/include/clang/AST/TypeProperties.td
    M clang/lib/AST/ASTContext.cpp
    M clang/lib/AST/Type.cpp
    M clang/lib/Sema/TreeTransform.h
    M clang/test/SemaCXX/cxx2c-pack-indexing.cpp

  Log Message:
  -----------
  [Clang] Preserve the ExpandsToEmpty flag in PackIndexingType (#107181)

Similar to PackIndexingExpr, we should avoid another round of
transformation of the pattern if the pattern has already turned out to
be an empty pack. As an outcome, the empty SubstTemplateTypeParmPackType
won't occur, and we don't need to collect any unexpanded packs.

Fixes https://github.com/llvm/llvm-project/issues/105903



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