================
@@ -31,6 +30,10 @@ class StringFindStartswithCheck : public ClangTidyCheck {
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
   void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+  bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
+    // Prefer performance-use-starts-ends-with when C++20 is available.
+    return LangOpts.CPlusPlus && !LangOpts.CPlusPlus20;
+  }
 
----------------
PiotrZSL wrote:

Use TK_IgnoreUnlessSpelledInSource to exclude things like template instances 
and  implicit code.

https://github.com/llvm/llvm-project/pull/72385
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