[all-commits] [llvm/llvm-project] a0651d: [clang][Sema] Avoid guessing unexpanded packs' siz...

[Younan Zhang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a0651db490328a972185e44ff637970b3456406b
      https://github.com/llvm/llvm-project/commit/a0651db490328a972185e44ff637970b3456406b
  Author: Younan Zhang <zyn7109 at gmail.com>
  Date:   2024-04-10 (Wed, 10 Apr 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Sema/SemaTemplateVariadic.cpp
    M clang/test/SemaTemplate/alias-templates.cpp

  Log Message:
  -----------
  [clang][Sema] Avoid guessing unexpanded packs' size in getFullyPackExpandedSize (#87768)

There has been an optimization for `SizeOfPackExprs` since c5452ed9, in
which
we overlooked a case where the template arguments were not yet
formed into a `PackExpansionType` at the token annotation stage. This
led to a problem in that a template involving such expressions may
lose its nature of being dependent, causing some false-positive
diagnostics.

Fixes https://github.com/llvm/llvm-project/issues/84220



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