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diff --git a/clang-tools-extra/clang-tidy/abseil/StrCatAppendCheck.h b/clang-tools-extra/clang-tidy/abseil/StrCatAppendCheck.h
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index 00000000000..eaa750daf32
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+++ b/clang-tools-extra/clang-tidy/abseil/StrCatAppendCheck.h
@@ -0,0 +1,36 @@
+//===--- StrCatAppendCheck.h - clang-tidy------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_STRCATAPPENDCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_STRCATAPPENDCHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace abseil {
+
+/// Flags uses of absl::StrCat to append to a string. Suggests absl::StrAppend
+/// should be used instead. 
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/abseil-str-cat-append.html
+class StrCatAppendCheck : public ClangTidyCheck {
+public:
+  StrCatAppendCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace abseil
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_STRCATAPPENDCHECK_H