[all-commits] [llvm/llvm-project] a89f17: [clang] Fix crash on invalid out-of-line enum defi...

[Haojian Wu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a89f174e502165ac566f922edeaee53329172b22
      https://github.com/llvm/llvm-project/commit/a89f174e502165ac566f922edeaee53329172b22
  Author: Haojian Wu <hokein.wu at gmail.com>
  Date:   2026-04-07 (Tue, 07 Apr 2026)

  Changed paths:
    M clang/lib/Sema/SemaDecl.cpp
    A clang/test/SemaTemplate/GH187909.cpp

  Log Message:
  -----------
  [clang] Fix crash on invalid out-of-line enum definition with template parameters (#188246)

clang crashes when an invalid out-of-line enum definition is provided
with template parameters. In these cases, clang produces a dependent
type within a non-dependent context, violating internal invariants.

The fix is to fallback the underlying type of the enum to `int` during
error recovery in `Sema::ActOnTag` when `Invalid` is true, making it
safe for downstream processing while still preserving the invalid
declaration in the AST.


Fixes #187909



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