[clang] 86b99ef - Revert "[Sema] Fix crash on invalid operator template-id (#181404)" (#183682)

[via cfe-commits]

Author: Yanzuo Liu
Date: 2026-02-27T04:55:30Z
New Revision: 86b99eff8c4d2fc8b3391a67d2ba88b0840f6fea

URL: https://github.com/llvm/llvm-project/commit/86b99eff8c4d2fc8b3391a67d2ba88b0840f6fea
DIFF: https://github.com/llvm/llvm-project/commit/86b99eff8c4d2fc8b3391a67d2ba88b0840f6fea.diff

LOG: Revert "[Sema] Fix crash on invalid operator template-id (#181404)" (#183682)

Reverts llvm/llvm-project#181404
(c056d7c5d6ea076b38fa937c54ab44ce2e5a95e1) because of post-commit ci
failure.

Added: 
    

Modified: 
    clang/docs/ReleaseNotes.rst
    clang/lib/Sema/SemaDecl.cpp

Removed: 
    clang/test/SemaCXX/crash-invalid-operator-template.cpp


################################################################################
diff  --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index c7a5a0704f288..88023779e4bb7 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -321,7 +321,6 @@ Bug Fixes to C++ Support
   when used inside decltype in the return type. (#GH180460)
 - Fixed a crash when evaluating uninitialized GCC vector/ext_vector_type vectors in ``constexpr``. (#GH180044)
 - Fixed a crash on ``typeid`` of incomplete local types during template instantiation. (#GH63242), (#GH176397)
-- Fixed a crash when handling invalid template-ids during error recovery in C++ code. (#GH177549)
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^

diff  --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 03349dffccc7e..3db91b00f9d80 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -6101,10 +6101,6 @@ Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
   }
 
   case UnqualifiedIdKind::IK_TemplateId: {
-
-    if (Name.TemplateId->isInvalid())
-      return DeclarationNameInfo();
-
     TemplateName TName = Name.TemplateId->Template.get();
     SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
     return Context.getNameForTemplate(TName, TNameLoc);

diff  --git a/clang/test/SemaCXX/crash-invalid-operator-template.cpp b/clang/test/SemaCXX/crash-invalid-operator-template.cpp
deleted file mode 100644
index 7a7b95c612e4d..0000000000000
--- a/clang/test/SemaCXX/crash-invalid-operator-template.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
-
-typedef(( operator | <> ) ) ( class { private: }); 
-// expected-error at -1 {{cannot be defined in a parameter type}}
-// expected-error at -2 {{type specifier is required}}
-// expected-error at -3 {{typedef name must be an identifier}}
-