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diff --git a/subprojects/lix-clang-tidy/HasPrefixSuffix.hh b/subprojects/lix-clang-tidy/HasPrefixSuffix.hh
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+++ b/subprojects/lix-clang-tidy/HasPrefixSuffix.hh
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+#pragma once
+///@file
+/// This is an example of a clang-tidy automated refactoring against the Nix
+/// codebase. The refactoring has been completed in
+/// https://gerrit.lix.systems/c/lix/+/565 so this code is around as
+/// an example.
+
+#include <clang-tidy/ClangTidyCheck.h>
+#include <clang/ASTMatchers/ASTMatchFinder.h>
+#include <llvm/ADT/StringRef.h>
+
+namespace nix::clang_tidy {
+
+using namespace clang;
+using namespace clang::tidy;
+using namespace llvm;
+
+class HasPrefixSuffixCheck : public ClangTidyCheck {
+public:
+  HasPrefixSuffixCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+}; // namespace nix::clang_tidy