================
@@ -0,0 +1,488 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "UseConstexprCheck.h"
+#include "../utils/ASTUtils.h"
+#include "../utils/LexerUtils.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::modernize {
+
+namespace {
+AST_MATCHER(FunctionDecl, locationPermitsConstexpr) {
+  const bool IsInMainFile =
+      Finder->getASTContext().getSourceManager().isInMainFile(
+          Node.getLocation());
+
+  if (IsInMainFile)
+    return !Node.hasExternalFormalLinkage();
+  return Node.isInlined();
+}
+
+AST_MATCHER(Expr, isCXX11ConstantExpr) {
+  return !Node.isValueDependent() &&
+         Node.isCXX11ConstantExpr(Finder->getASTContext());
+}
+
+AST_MATCHER(DeclaratorDecl, isInMacro) {
+  const SourceRange R =
+      SourceRange(Node.getTypeSpecStartLoc(), Node.getLocation());
----------------
localspook wrote:

```suggestion
  const SourceRange R(Node.getTypeSpecStartLoc(), Node.getLocation());
```

https://github.com/llvm/llvm-project/pull/162741
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