bernhardmgruber updated this revision to Diff 179986.
bernhardmgruber added a comment.

rebased from release_70 onto master


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D56160/new/

https://reviews.llvm.org/D56160

Files:
  clang-tidy/modernize/CMakeLists.txt
  clang-tidy/modernize/ModernizeTidyModule.cpp
  clang-tidy/modernize/UseTrailingReturnCheck.cpp
  clang-tidy/modernize/UseTrailingReturnCheck.h
  docs/ReleaseNotes.rst
  docs/clang-tidy/checks/list.rst
  docs/clang-tidy/checks/modernize-use-trailing-return.rst
  test/clang-tidy/modernize-use-trailing-return.cpp

Index: test/clang-tidy/modernize-use-trailing-return.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/modernize-use-trailing-return.cpp
@@ -0,0 +1,173 @@
+// RUN: %check_clang_tidy %s modernize-use-trailing-return %t -- -- --std=c++14
+
+namespace std {
+    template <typename T>
+    class vector;
+
+    class string;
+}
+
+//
+// Samples triggering the check
+//
+
+int f();
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto f() -> int;{{$}}
+int f(int);
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto f(int) -> int;{{$}}
+int f(int arg);
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto f(int arg) -> int;{{$}}
+int f(int arg1, int arg2, int arg3);
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto f(int arg1, int arg2, int arg3) -> int;{{$}}
+int f(int arg1, int arg2, int arg3, ...);
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto f(int arg1, int arg2, int arg3, ...) -> int;{{$}}
+template <typename T> int f(T t);
+// CHECK-MESSAGES: :[[@LINE-1]]:27: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}template <typename T> auto f(T t) -> int;{{$}}
+int a1() { return 42; }
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto a1() -> int { return 42; }{{$}}
+int a2() {
+    return 42;
+}
+// CHECK-MESSAGES: :[[@LINE-3]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto a2() -> int {{{$}}
+int a3()
+{
+    return 42;
+}
+// CHECK-MESSAGES: :[[@LINE-4]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto a3() -> int{{$}}
+int b1(int   arg   )   ;
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto b1(int   arg   ) -> int   ;{{$}}
+int b2
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto b2{{$}}
+(int arg);
+// CHECK-FIXES: {{^}}(int arg) -> int;{{$}}
+inline int d1(int arg);
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}inline auto d1(int arg) -> int;{{$}}
+inline int d2(int arg) noexcept(true);
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}inline auto d2(int arg) -> int noexcept(true);{{$}}
+inline int d3(int arg) try { } catch(...) { }
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}inline auto d3(int arg) -> int try { } catch(...) { }{{$}}
+namespace N {
+    bool e1();
+}
+// CHECK-MESSAGES: :[[@LINE-2]]:10: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    auto e1() -> bool;{{$}}
+inline volatile const std::vector<std::string> e2();
+// CHECK-MESSAGES: :[[@LINE-1]]:48: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}inline auto e2() -> volatile const std::vector<std::string>;{{$}}
+inline const std::vector<std::string> volatile e2();
+// CHECK-MESSAGES: :[[@LINE-1]]:48: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}inline auto e2() -> const std::vector<std::string> volatile;{{$}}
+inline std::vector<std::string> const volatile e2();
+// CHECK-MESSAGES: :[[@LINE-1]]:48: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}inline auto e2() -> std::vector<std::string> const volatile;{{$}}
+bool N::e1() {}
+// CHECK-MESSAGES: :[[@LINE-1]]:9: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto N::e1() -> bool {}{{$}}
+int (*e3())(double);
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: use a trailing return type for this function (FixIt not implemented) [modernize-use-trailing-return]
+// TODO: not matched by the AST matcher
+//decltype(auto) e4();
+// _HECK-MESSAGES: :[[@LINE-1]]:16: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// _HECK-FIXES: {{^}}auto e4() -> decltype(auto);{{$}}
+
+struct B {
+    B& operator=(const B&);
+// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    auto operator=(const B&) -> B&;{{$}}
+    
+    double base1(int, bool b);
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    auto base1(int, bool b) -> double;{{$}}
+
+    virtual double base2(int, bool b) {}
+// CHECK-MESSAGES: :[[@LINE-1]]:20: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    virtual auto base2(int, bool b) -> double {}{{$}}
+
+    virtual float base3() const = 0;
+// CHECK-MESSAGES: :[[@LINE-1]]:19: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    virtual auto base3() const -> float = 0;{{$}}
+
+    double base4(int, bool b) &&;
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    auto base4(int, bool b) && -> double;{{$}}
+
+    double base5(int, bool b) const &&;
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    auto base5(int, bool b) const && -> double;{{$}}
+
+    double base6(int, bool b) const & = delete;
+// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    auto base6(int, bool b) const & -> double = delete;{{$}}
+};
+
+double B::base1(int, bool b) {}
+// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto B::base1(int, bool b) -> double {}{{$}}
+
+struct D : B {
+    virtual double f1(int, bool b) final;
+// CHECK-MESSAGES: :[[@LINE-1]]:20: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    virtual auto f1(int, bool b) -> double final;{{$}}
+
+    virtual double base2(int, bool b) override;
+// CHECK-MESSAGES: :[[@LINE-1]]:20: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    virtual auto base2(int, bool b) -> double override;{{$}}
+
+    virtual float base3() const override final { }
+// CHECK-MESSAGES: :[[@LINE-1]]:19: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}    virtual auto base3() const -> float override final { }{{$}}
+};
+
+int g1() [[asdf]];
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto g1() -> int {{[[][[]}}asdf{{[]][]]}};{{$}}
+[[noreturn]] int g2();
+// CHECK-MESSAGES: :[[@LINE-1]]:18: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}{{[[][[]}}noreturn{{[]][]]}} auto g2() -> int;{{$}}
+int g2 [[noreturn]] ();
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use a trailing return type for this function [modernize-use-trailing-return]
+// CHECK-FIXES: {{^}}auto g2 {{[[][[]}}noreturn{{[]][]]}} () -> int;{{$}}
+
+//
+// Samples which do not trigger the check
+//
+
+auto ff();
+auto f() -> int;
+auto f(int) -> int;
+auto f(int arg) -> int;
+auto f(int arg1, int arg2, int arg3) -> int;
+auto f(int arg1, int arg2, int arg3, ...) -> int;
+template <typename T> auto f(T t) -> int;
+
+void c();
+void c(int arg);
+void c(int arg) { return; }
+
+struct D2 : B {
+    D2();
+    virtual ~D2();
+    
+    virtual auto f1(int, bool b) -> double final;
+    virtual auto base2(int, bool b) -> double override;
+    virtual auto base3() const -> float override final { }
+
+    operator double();
+};
+
+auto l1 = [](int arg) {};
+auto l2 = [](int arg) -> double {};
Index: docs/clang-tidy/checks/modernize-use-trailing-return.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/modernize-use-trailing-return.rst
@@ -0,0 +1,26 @@
+.. title:: clang-tidy - modernize-use-trailing-return
+
+modernize-use-trailing-return
+=============================
+
+Rewrites function signatures to use a trailing return type
+(introduced in C++11). This transformation is purely stylistic.
+The return type before the function name is replaced by ``auto``
+and inserted after the function parameter list (and qualifiers).
+
+Example
+-------
+
+.. code-block:: c++
+
+  int f1();
+  inline int f2(int arg) noexcept;
+  virtual float f3() const && = delete;
+
+transforms to:
+
+.. code-block:: c++
+
+  auto f1() -> int;
+  inline auto f2(int arg) -> int noexcept;
+  virtual auto f3() const && -> float = delete;
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -210,6 +210,7 @@
    modernize-use-noexcept
    modernize-use-nullptr
    modernize-use-override
+   modernize-use-trailing-return
    modernize-use-transparent-functors
    modernize-use-uncaught-exceptions
    modernize-use-using
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -180,6 +180,11 @@
   Detects usage of the deprecated member types of ``std::ios_base`` and replaces
   those that have a non-deprecated equivalent.
 
+- New :doc:`modernize-use-trailing-return
+  <clang-tidy/checks/modernize-use-trailing-return>` check.
+
+  Rewrites function signatures to use a trailing return type.
+
 - New :doc:`readability-isolate-decl
   <clang-tidy/checks/readability-isolate-declaration>` check.
 
Index: clang-tidy/modernize/UseTrailingReturnCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/modernize/UseTrailingReturnCheck.h
@@ -0,0 +1,35 @@
+//===--- UseTrailingReturnCheck.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_MODERNIZE_USETRAILINGRETURNCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USETRAILINGRETURNCHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+/// Rewrites function signatures to use a trailing return type.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/modernize-use-trailing-return.html
+class UseTrailingReturnCheck : public ClangTidyCheck {
+public:
+  UseTrailingReturnCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USETRAILINGRETURNCHECK_H
Index: clang-tidy/modernize/UseTrailingReturnCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/modernize/UseTrailingReturnCheck.cpp
@@ -0,0 +1,207 @@
+//===--- UseTrailingReturnCheck.cpp - clang-tidy---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "UseTrailingReturnCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+// very similar to UseOverrideCheck
+static SourceLocation findTrailingReturnTypeSourceLocation(
+    const CharSourceRange &Range, const ASTContext &Ctx,
+    const SourceManager &SM, const LangOptions &LangOpts) {
+  const std::pair<FileID, unsigned> Loc = SM.getDecomposedLoc(Range.getBegin());
+  const StringRef File = SM.getBufferData(Loc.first);
+  const char *TokenBegin = File.data() + Loc.second;
+  Lexer Lexer(SM.getLocForStartOfFile(Loc.first), LangOpts, File.begin(),
+              TokenBegin, File.end());
+  Token T;
+  int NestedParens = 0;
+  SourceLocation Result;
+  while (!Lexer.LexFromRawLexer(T)) {
+    if (SM.isBeforeInTranslationUnit(Range.getEnd(), T.getLocation()))
+      break;
+    if (Result.isValid()) {
+      // we found the closing parenthesis, skip additional const and ref
+      // qualifiers
+
+      if (T.is(tok::amp) || T.is(tok::ampamp)) {
+        Result = T.getEndLoc();
+        continue;
+      }
+
+      if (T.is(tok::raw_identifier)) {
+        IdentifierInfo &Info = Ctx.Idents.get(
+            StringRef(SM.getCharacterData(T.getLocation()), T.getLength()));
+        T.setIdentifierInfo(&Info);
+        T.setKind(Info.getTokenID());
+      }
+
+      if (T.is(tok::kw_const)) {
+        Result = T.getEndLoc();
+        continue;
+      }
+
+      return Result;
+    }
+    if (T.is(tok::l_paren))
+      ++NestedParens;
+    else if (T.is(tok::r_paren)) {
+      --NestedParens;
+      if (NestedParens == 0)
+        Result = T.getEndLoc(); // store location, next token might be const
+    }
+  }
+
+  if (Result.isValid())
+    return Result;
+
+  llvm_unreachable("Expected to find a closing parenthesis");
+}
+
+static SourceRange findReturnTypeAndCVSourceRange(const FunctionDecl &F,
+                                            const ASTContext &Ctx,
+                                            const SourceManager &SM,
+                                            const LangOptions &LangOpts) {
+
+  // we start with the range of the return type and expand to neighboring const
+  // and volatile
+  SourceRange ReturnTypeRange = F.getReturnTypeSourceRange();
+
+  // create tokens for everything before the name of the function
+  const std::pair<FileID, unsigned> Loc = SM.getDecomposedLoc(F.getBeginLoc());
+  const StringRef File = SM.getBufferData(Loc.first);
+  const char *TokenBegin = File.data() + Loc.second;
+  Lexer Lexer(SM.getLocForStartOfFile(Loc.first), LangOpts, File.begin(),
+              TokenBegin, File.end());
+  Token T;
+  SmallVector<Token, 8> Tokens;
+  while (!Lexer.LexFromRawLexer(T)) {
+    if (SM.isBeforeInTranslationUnit(F.getLocation(), T.getLocation()))
+      break;
+    if (T.is(tok::raw_identifier)) {
+      IdentifierInfo &Info = Ctx.Idents.get(
+          StringRef(SM.getCharacterData(T.getLocation()), T.getLength()));
+      T.setIdentifierInfo(&Info);
+      T.setKind(Info.getTokenID());
+    }
+    Tokens.push_back(T);
+  }
+
+  // include const and volatile to the left and right of the return type
+  auto IsCV = [](Token T) {
+    return T.is(tok::kw_const) || T.is(tok::kw_volatile);
+  };
+
+  bool ExtendedLeft = false;
+  for (int i = 0; i < Tokens.size(); i++) {
+    // if we found the beginning of the return type, include const and volatile
+    // to the left
+    if (!SM.isBeforeInTranslationUnit(Tokens[i].getLocation(),
+                                      ReturnTypeRange.getBegin()) &&
+        !ExtendedLeft) {
+      for (int j = i - 1; j >= 0 && IsCV(Tokens[j]); j--)
+        ReturnTypeRange.setBegin(Tokens[j].getLocation());
+      ExtendedLeft = true;
+    }
+    // if we found the end of the return type, include const and volatile to the
+    // right
+    if (SM.isBeforeInTranslationUnit(ReturnTypeRange.getEnd(),
+                                     Tokens[i].getLocation())) {
+      for (int j = i; j < Tokens.size() && IsCV(Tokens[j]); j++)
+        ReturnTypeRange.setEnd(Tokens[j].getLocation());
+      break;
+    }
+  }
+
+  return ReturnTypeRange;
+}
+
+void UseTrailingReturnCheck::registerMatchers(MatchFinder *Finder) {
+  if (!getLangOpts().CPlusPlus11)
+    return;
+
+  Finder->addMatcher(
+      functionDecl(unless(anyOf(hasTrailingReturn(), returns(voidType()),
+                                returns(autoType()), cxxConversionDecl())))
+          .bind("f"),
+      this);
+}
+
+void UseTrailingReturnCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *F = Result.Nodes.getNodeAs<FunctionDecl>("f");
+  if (!F)
+    return;
+
+  if (const auto *M = dyn_cast<CXXMethodDecl>(F))
+    if (M->isImplicit() || M->getLocation().isMacroID())
+      return;
+
+  if (F->getDeclaredReturnType()->isFunctionPointerType()) {
+    diag(
+        F->getLocation(),
+        "use a trailing return type for this function (FixIt not implemented)");
+    return;
+  }
+
+  const auto &Ctx = *Result.Context;
+  const auto &SM = *Result.SourceManager;
+  const auto &LangOpts = getLangOpts();
+
+  SourceRange ReturnTypeCVRange = findReturnTypeAndCVSourceRange(*F, Ctx, SM, LangOpts);
+  if (!ReturnTypeCVRange.isValid()) {
+    diag(F->getLocation(),
+         "use a trailing return type for this function (failed to determine "
+         "return type source range, could clang resolve all #includes?)",
+         DiagnosticIDs::Level::Error);
+    return;
+  }
+
+  const CharSourceRange CharRange = Lexer::makeFileCharRange(
+      CharSourceRange::getTokenRange(F->getSourceRange()), SM, LangOpts);
+  if (!CharRange.isValid())
+    return;
+  const SourceLocation InsertionLoc =
+      findTrailingReturnTypeSourceLocation(CharRange, Ctx, SM, LangOpts);
+
+  // extract return type as string
+  const std::string ReturnType = [&] {
+    // using the declared return type via
+    // F->getDeclaredReturnType().getAsString() discards user formatting and
+    // order (order of const, volatile, type, whitespace, space before & ...)
+
+    const std::pair<FileID, unsigned> Beg =
+        SM.getDecomposedLoc(ReturnTypeCVRange.getBegin());
+    const StringRef File = SM.getBufferData(Beg.first);
+    const char *BegPtr = File.data() + Beg.second;
+
+    const std::pair<FileID, unsigned> End =
+        SM.getDecomposedLoc(Lexer::getLocForEndOfToken(
+            ReturnTypeCVRange.getEnd(), 0, SM, LangOpts));
+    assert(Beg.first == End.first);
+    assert(Beg.second != End.second);
+    const char *EndPtr = File.data() + End.second;
+
+    return std::string(BegPtr, EndPtr);
+  }();
+
+  auto D =
+      diag(F->getLocation(), "use a trailing return type for this function");
+  D << FixItHint::CreateReplacement(ReturnTypeCVRange, "auto");
+  D << FixItHint::CreateInsertion(InsertionLoc, " -> " + ReturnType);
+}
+
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/modernize/ModernizeTidyModule.cpp
===================================================================
--- clang-tidy/modernize/ModernizeTidyModule.cpp
+++ clang-tidy/modernize/ModernizeTidyModule.cpp
@@ -35,6 +35,7 @@
 #include "UseNoexceptCheck.h"
 #include "UseNullptrCheck.h"
 #include "UseOverrideCheck.h"
+#include "UseTrailingReturnCheck.h"
 #include "UseTransparentFunctorsCheck.h"
 #include "UseUncaughtExceptionsCheck.h"
 #include "UseUsingCheck.h"
@@ -85,6 +86,8 @@
     CheckFactories.registerCheck<UseNoexceptCheck>("modernize-use-noexcept");
     CheckFactories.registerCheck<UseNullptrCheck>("modernize-use-nullptr");
     CheckFactories.registerCheck<UseOverrideCheck>("modernize-use-override");
+    CheckFactories.registerCheck<UseTrailingReturnCheck>(
+        "modernize-use-trailing-return");
     CheckFactories.registerCheck<UseTransparentFunctorsCheck>(
         "modernize-use-transparent-functors");
     CheckFactories.registerCheck<UseUncaughtExceptionsCheck>(
Index: clang-tidy/modernize/CMakeLists.txt
===================================================================
--- clang-tidy/modernize/CMakeLists.txt
+++ clang-tidy/modernize/CMakeLists.txt
@@ -29,6 +29,7 @@
   UseNoexceptCheck.cpp
   UseNullptrCheck.cpp
   UseOverrideCheck.cpp
+  UseTrailingReturnCheck.cpp
   UseTransparentFunctorsCheck.cpp
   UseUncaughtExceptionsCheck.cpp
   UseUsingCheck.cpp
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