https://github.com/anutosh491 updated 
https://github.com/llvm/llvm-project/pull/181335

>From ac14ffa9d7b99a03dc56b1e25f81a92a0c43cf43 Mon Sep 17 00:00:00 2001
From: anutosh491 <[email protected]>
Date: Fri, 13 Feb 2026 14:23:45 +0530
Subject: [PATCH] ReApply [clang-repl] Ensure clang-repl accepts all C keywords
 supported in all language models

---
 clang/lib/Parse/ParseTentative.cpp                |  2 ++
 clang/test/Interpreter/disambiguate-decl-stmt.cpp | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/clang/lib/Parse/ParseTentative.cpp 
b/clang/lib/Parse/ParseTentative.cpp
index 0047e3ea3749b..c08546816d35a 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -1192,6 +1192,7 @@ Parser::isCXXDeclarationSpecifier(ImplicitTypenameContext 
AllowImplicitTypename,
   case tok::kw_inline:
   case tok::kw_virtual:
   case tok::kw_explicit:
+  case tok::kw__Noreturn:
 
     // Modules
   case tok::kw___module_private__:
@@ -1246,6 +1247,7 @@ Parser::isCXXDeclarationSpecifier(ImplicitTypenameContext 
AllowImplicitTypename,
     // GNU
   case tok::kw_restrict:
   case tok::kw__Complex:
+  case tok::kw__Imaginary:
   case tok::kw___attribute:
   case tok::kw___auto_type:
     return TPResult::True;
diff --git a/clang/test/Interpreter/disambiguate-decl-stmt.cpp 
b/clang/test/Interpreter/disambiguate-decl-stmt.cpp
index 24902cee8ed1f..8183c7c18ee2f 100644
--- a/clang/test/Interpreter/disambiguate-decl-stmt.cpp
+++ b/clang/test/Interpreter/disambiguate-decl-stmt.cpp
@@ -101,3 +101,16 @@ __attribute((noreturn)) Attrs2::Attrs2() = default;
 
 // Extra semicolon
 namespace N {};
+
+// Test C keywords supported in all language modes.
+// 
https://clang.llvm.org/docs/LanguageExtensions.html#c-keywords-supported-in-all-language-modes
+
+_Alignas(16) int aligned_var;
+int align = _Alignof(double);
+_Atomic int atomic_var = 0;
+_Complex double complex_val = 1.0 + 2.0i;
+_Float16 f = 1.5; // expected-error 0-1{{_Float16 is not supported on this 
target}}
+_Thread_local int counter = 0;
+_Static_assert(sizeof(int) == 4, "int must be 4 bytes");
+_Imaginary float i = 2.0f; // expected-error {{imaginary types are not 
supported}}
+_Noreturn void noreturn_func() { while (true) {} }
\ No newline at end of file

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