[clang-tools-extra] r327833 - [clang-tidy] New check bugprone-unused-return-value
via cfe-commits
cfe-commits at lists.llvm.org
Mon Mar 19 14:43:20 PDT 2018
This should be fixed by r327911.
Douglas Yung
From: cfe-commits [mailto:cfe-commits-bounces at lists.llvm.org] On Behalf Of Galina Kistanova via cfe-commits
Sent: Monday, March 19, 2018 13:13
To: Alexander Kornienko
Cc: cfe-commits
Subject: Re: [clang-tools-extra] r327833 - [clang-tidy] New check bugprone-unused-return-value
Hello Alexander,
This commit broke at least two of our builders:
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-ubuntu-fast/builds/26909
http://lab.llvm.org:8011/builders/llvm-clang-lld-x86_64-scei-ps4-windows10pro-fast
. . .
Failing Tests (1):
Clang Tools :: clang-tidy/bugprone-unused-return-value.cpp
Please have a look?
It is not good idea to keep the bot red for too long. This hides new problem which later hard to track down.
Thanks
Galina
On Mon, Mar 19, 2018 at 6:02 AM, Alexander Kornienko via cfe-commits <cfe-commits at lists.llvm.org<mailto:cfe-commits at lists.llvm.org>> wrote:
Author: alexfh
Date: Mon Mar 19 06:02:32 2018
New Revision: 327833
URL: http://llvm.org/viewvc/llvm-project?rev=327833&view=rev
Log:
[clang-tidy] New check bugprone-unused-return-value
Summary:
Detects function calls where the return value is unused.
Checked functions can be configured.
Reviewers: alexfh, aaron.ballman, ilya-biryukov, hokein
Reviewed By: alexfh, aaron.ballman
Subscribers: hintonda, JonasToth, Eugene.Zelenko, mgorny, xazax.hun, cfe-commits
Tags: #clang-tools-extra
Patch by Kalle Huttunen!
Differential Revision: https://reviews.llvm.org/D41655
Added:
clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.cpp
clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.h
clang-tools-extra/trunk/docs/clang-tidy/checks/bugprone-unused-return-value.rst
clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value-custom.cpp
clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value.cpp
Modified:
clang-tools-extra/trunk/clang-tidy/bugprone/BugproneTidyModule.cpp
clang-tools-extra/trunk/clang-tidy/bugprone/CMakeLists.txt
clang-tools-extra/trunk/docs/ReleaseNotes.rst
clang-tools-extra/trunk/docs/clang-tidy/checks/list.rst
Modified: clang-tools-extra/trunk/clang-tidy/bugprone/BugproneTidyModule.cpp
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/clang-tidy/bugprone/BugproneTidyModule.cpp?rev=327833&r1=327832&r2=327833&view=diff
==============================================================================
--- clang-tools-extra/trunk/clang-tidy/bugprone/BugproneTidyModule.cpp (original)
+++ clang-tools-extra/trunk/clang-tidy/bugprone/BugproneTidyModule.cpp Mon Mar 19 06:02:32 2018
@@ -43,6 +43,7 @@
#include "UndefinedMemoryManipulationCheck.h"
#include "UndelegatedConstructorCheck.h"
#include "UnusedRaiiCheck.h"
+#include "UnusedReturnValueCheck.h"
#include "UseAfterMoveCheck.h"
#include "VirtualNearMissCheck.h"
@@ -119,6 +120,8 @@ public:
"bugprone-undelegated-constructor");
CheckFactories.registerCheck<UnusedRaiiCheck>(
"bugprone-unused-raii");
+ CheckFactories.registerCheck<UnusedReturnValueCheck>(
+ "bugprone-unused-return-value");
CheckFactories.registerCheck<UseAfterMoveCheck>(
"bugprone-use-after-move");
CheckFactories.registerCheck<VirtualNearMissCheck>(
Modified: clang-tools-extra/trunk/clang-tidy/bugprone/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/clang-tidy/bugprone/CMakeLists.txt?rev=327833&r1=327832&r2=327833&view=diff
==============================================================================
--- clang-tools-extra/trunk/clang-tidy/bugprone/CMakeLists.txt (original)
+++ clang-tools-extra/trunk/clang-tidy/bugprone/CMakeLists.txt Mon Mar 19 06:02:32 2018
@@ -35,6 +35,7 @@ add_clang_library(clangTidyBugproneModul
UndefinedMemoryManipulationCheck.cpp
UndelegatedConstructorCheck.cpp
UnusedRaiiCheck.cpp
+ UnusedReturnValueCheck.cpp
UseAfterMoveCheck.cpp
VirtualNearMissCheck.cpp
Added: clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.cpp
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.cpp?rev=327833&view=auto
==============================================================================
--- clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.cpp (added)
+++ clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.cpp Mon Mar 19 06:02:32 2018
@@ -0,0 +1,82 @@
+//===--- UnusedReturnValueCheck.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 "UnusedReturnValueCheck.h"
+#include "../utils/OptionsUtils.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+using namespace clang::ast_matchers::internal;
+
+namespace clang {
+namespace tidy {
+namespace bugprone {
+
+UnusedReturnValueCheck::UnusedReturnValueCheck(llvm::StringRef Name,
+ ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context),
+ CheckedFunctions(Options.get("CheckedFunctions", "::std::async;"
+ "::std::launder;"
+ "::std::remove;"
+ "::std::remove_if;"
+ "::std::unique")) {}
+
+void UnusedReturnValueCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+ Options.store(Opts, "CheckedFunctions", CheckedFunctions);
+}
+
+void UnusedReturnValueCheck::registerMatchers(MatchFinder *Finder) {
+ auto FunVec = utils::options::parseStringList(CheckedFunctions);
+ auto MatchedCallExpr = expr(ignoringImplicit(ignoringParenImpCasts(
+ callExpr(
+ callee(functionDecl(
+ // Don't match void overloads of checked functions.
+ unless(returns(voidType())), hasAnyName(std::vector<StringRef>(
+ FunVec.begin(), FunVec.end())))))
+ .bind("match"))));
+
+ auto UnusedInCompoundStmt =
+ compoundStmt(forEach(MatchedCallExpr),
+ // The checker can't currently differentiate between the
+ // return statement and other statements inside GNU statement
+ // expressions, so disable the checker inside them to avoid
+ // false positives.
+ unless(hasParent(stmtExpr())));
+ auto UnusedInIfStmt =
+ ifStmt(eachOf(hasThen(MatchedCallExpr), hasElse(MatchedCallExpr)));
+ auto UnusedInWhileStmt = whileStmt(hasBody(MatchedCallExpr));
+ auto UnusedInDoStmt = doStmt(hasBody(MatchedCallExpr));
+ auto UnusedInForStmt =
+ forStmt(eachOf(hasLoopInit(MatchedCallExpr),
+ hasIncrement(MatchedCallExpr), hasBody(MatchedCallExpr)));
+ auto UnusedInRangeForStmt = cxxForRangeStmt(hasBody(MatchedCallExpr));
+ auto UnusedInCaseStmt = switchCase(forEach(MatchedCallExpr));
+
+ Finder->addMatcher(
+ stmt(anyOf(UnusedInCompoundStmt, UnusedInIfStmt, UnusedInWhileStmt,
+ UnusedInDoStmt, UnusedInForStmt, UnusedInRangeForStmt,
+ UnusedInCaseStmt)),
+ this);
+}
+
+void UnusedReturnValueCheck::check(const MatchFinder::MatchResult &Result) {
+ if (const auto *Matched = Result.Nodes.getNodeAs<CallExpr>("match")) {
+ diag(Matched->getLocStart(),
+ "the value returned by this function should be used")
+ << Matched->getSourceRange();
+ diag(Matched->getLocStart(),
+ "cast the expression to void to silence this warning",
+ DiagnosticIDs::Note);
+ }
+}
+
+} // namespace bugprone
+} // namespace tidy
+} // namespace clang
Added: clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.h
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.h?rev=327833&view=auto
==============================================================================
--- clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.h (added)
+++ clang-tools-extra/trunk/clang-tidy/bugprone/UnusedReturnValueCheck.h Mon Mar 19 06:02:32 2018
@@ -0,0 +1,39 @@
+//===--- UnusedReturnValueCheck.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_BUGPRONE_UNUSEDRETURNVALUECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_UNUSEDRETURNVALUECHECK_H
+
+#include "../ClangTidy.h"
+#include <string>
+
+namespace clang {
+namespace tidy {
+namespace bugprone {
+
+/// Detects function calls where the return value is unused.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone-unused-return-value.html
+class UnusedReturnValueCheck : public ClangTidyCheck {
+public:
+ UnusedReturnValueCheck(StringRef Name, ClangTidyContext *Context);
+ void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+ std::string CheckedFunctions;
+};
+
+} // namespace bugprone
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_UNUSEDRETURNVALUECHECK_H
Modified: clang-tools-extra/trunk/docs/ReleaseNotes.rst
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/docs/ReleaseNotes.rst?rev=327833&r1=327832&r2=327833&view=diff
==============================================================================
--- clang-tools-extra/trunk/docs/ReleaseNotes.rst (original)
+++ clang-tools-extra/trunk/docs/ReleaseNotes.rst Mon Mar 19 06:02:32 2018
@@ -67,6 +67,11 @@ Improvements to clang-tidy
Diagnoses when a temporary object that appears to be an exception is
constructed but not thrown.
+- New `bugprone-unused-return-value
+ <http://clang.llvm.org/extra/clang-tidy/checks/bugprone-unused-return-value.html>`_ check
+
+ Warns on unused function return values.
+
- New `cppcoreguidelines-avoid-goto
<http://clang.llvm.org/extra/clang-tidy/checks/cppcoreguidelines-avoid-goto.html>`_ check
Added: clang-tools-extra/trunk/docs/clang-tidy/checks/bugprone-unused-return-value.rst
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/docs/clang-tidy/checks/bugprone-unused-return-value.rst?rev=327833&view=auto
==============================================================================
--- clang-tools-extra/trunk/docs/clang-tidy/checks/bugprone-unused-return-value.rst (added)
+++ clang-tools-extra/trunk/docs/clang-tidy/checks/bugprone-unused-return-value.rst Mon Mar 19 06:02:32 2018
@@ -0,0 +1,24 @@
+.. title:: clang-tidy - bugprone-unused-return-value
+
+bugprone-unused-return-value
+============================
+
+Warns on unused function return values. The checked funtions can be configured.
+
+Options
+-------
+
+.. option:: CheckedFunctions
+
+ Semicolon-separated list of functions to check. Defaults to
+ ``::std::async;::std::launder;::std::remove;::std::remove_if;::std::unique``.
+ This means that the calls to following functions are checked by default:
+
+ - ``std::async()``. Not using the return value makes the call synchronous.
+ - ``std::launder()``. Not using the return value usually means that the
+ function interface was misunderstood by the programmer. Only the returned
+ pointer is "laundered", not the argument.
+ - ``std::remove()``, ``std::remove_if()`` and ``std::unique()``. The returned
+ iterator indicates the boundary between elements to keep and elements to be
+ removed. Not using the return value means that the information about which
+ elements to remove is lost.
Modified: clang-tools-extra/trunk/docs/clang-tidy/checks/list.rst
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/docs/clang-tidy/checks/list.rst?rev=327833&r1=327832&r2=327833&view=diff
==============================================================================
--- clang-tools-extra/trunk/docs/clang-tidy/checks/list.rst (original)
+++ clang-tools-extra/trunk/docs/clang-tidy/checks/list.rst Mon Mar 19 06:02:32 2018
@@ -51,6 +51,7 @@ Clang-Tidy Checks
bugprone-undefined-memory-manipulation
bugprone-undelegated-constructor
bugprone-unused-raii
+ bugprone-unused-return-value
bugprone-use-after-move
bugprone-virtual-near-miss
cert-dcl03-c (redirects to misc-static-assert) <cert-dcl03-c>
Added: clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value-custom.cpp
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value-custom.cpp?rev=327833&view=auto
==============================================================================
--- clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value-custom.cpp (added)
+++ clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value-custom.cpp Mon Mar 19 06:02:32 2018
@@ -0,0 +1,82 @@
+// RUN: %check_clang_tidy %s bugprone-unused-return-value %t \
+// RUN: -config='{CheckOptions: \
+// RUN: [{key: bugprone-unused-return-value.CheckedFunctions, \
+// RUN: value: "::fun;::ns::Outer::Inner::memFun;::ns::Type::staticFun"}]}' \
+// RUN: --
+
+namespace std {
+
+template <typename T>
+T *launder(T *);
+
+} // namespace std
+
+namespace ns {
+
+struct Outer {
+ struct Inner {
+ bool memFun();
+ };
+};
+
+using AliasName = Outer;
+
+struct Derived : public Outer::Inner {};
+
+struct Retval {
+ int *P;
+ Retval() { P = new int; }
+ ~Retval() { delete P; }
+};
+
+struct Type {
+ Retval memFun();
+ static Retval staticFun();
+};
+
+} // namespace ns
+
+int fun();
+void fun(int);
+
+void warning() {
+ fun();
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ (fun());
+ // CHECK-MESSAGES: [[@LINE-1]]:4: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ ns::Outer::Inner ObjA1;
+ ObjA1.memFun();
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ ns::AliasName::Inner ObjA2;
+ ObjA2.memFun();
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ ns::Derived ObjA3;
+ ObjA3.memFun();
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ ns::Type::staticFun();
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+}
+
+void noWarning() {
+ auto R1 = fun();
+
+ ns::Outer::Inner ObjB1;
+ auto R2 = ObjB1.memFun();
+
+ auto R3 = ns::Type::staticFun();
+
+ // test calling a void overload of a checked function
+ fun(5);
+
+ // test discarding return value of functions that are not configured to be checked
+ int I = 1;
+ std::launder(&I);
+
+ ns::Type ObjB2;
+ ObjB2.memFun();
+}
Added: clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value.cpp
URL: http://llvm.org/viewvc/llvm-project/clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value.cpp?rev=327833&view=auto
==============================================================================
--- clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value.cpp (added)
+++ clang-tools-extra/trunk/test/clang-tidy/bugprone-unused-return-value.cpp Mon Mar 19 06:02:32 2018
@@ -0,0 +1,166 @@
+// RUN: %check_clang_tidy %s bugprone-unused-return-value %t
+
+namespace std {
+
+struct future {};
+
+enum class launch {
+ async,
+ deferred
+};
+
+template <typename Function, typename... Args>
+future async(Function &&, Args &&...);
+
+template <typename Function, typename... Args>
+future async(launch, Function &&, Args &&...);
+
+template <typename ForwardIt, typename T>
+ForwardIt remove(ForwardIt, ForwardIt, const T &);
+
+template <typename ForwardIt, typename UnaryPredicate>
+ForwardIt remove_if(ForwardIt, ForwardIt, UnaryPredicate);
+
+template <typename ForwardIt>
+ForwardIt unique(ForwardIt, ForwardIt);
+
+// the check should be able to match std lib calls even if the functions are
+// declared inside inline namespaces
+inline namespace v1 {
+
+template <typename T>
+T *launder(T *);
+
+} // namespace v1
+} // namespace std
+
+struct Foo {
+ void f();
+};
+
+int increment(int i) {
+ return i + 1;
+}
+
+void useFuture(const std::future &fut);
+
+void warning() {
+ std::async(increment, 42);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ std::async(std::launch::async, increment, 42);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ Foo F;
+ std::launder(&F);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ std::remove_if(nullptr, nullptr, nullptr);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ std::unique(nullptr, nullptr);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ // test discarding return values inside different kinds of statements
+
+ auto Lambda = [] { std::remove(nullptr, nullptr, 1); };
+ // CHECK-MESSAGES: [[@LINE-1]]:22: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ if (true)
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ else if (true)
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ else
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ while (true)
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ do
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ while (true);
+
+ for (;;)
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ for (std::remove(nullptr, nullptr, 1);;)
+ // CHECK-MESSAGES: [[@LINE-1]]:8: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ ;
+
+ for (;; std::remove(nullptr, nullptr, 1))
+ // CHECK-MESSAGES: [[@LINE-1]]:11: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ ;
+
+ for (auto C : "foo")
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+
+ switch (1) {
+ case 1:
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ break;
+ default:
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ break;
+ }
+
+ try {
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ } catch (...) {
+ std::remove(nullptr, nullptr, 1);
+ // CHECK-MESSAGES: [[@LINE-1]]:5: warning: the value returned by this function should be used [bugprone-unused-return-value]
+ }
+}
+
+void noWarning() {
+ auto AsyncRetval1 = std::async(increment, 42);
+ auto AsyncRetval2 = std::async(std::launch::async, increment, 42);
+
+ Foo FNoWarning;
+ auto LaunderRetval = std::launder(&FNoWarning);
+
+ auto RemoveRetval = std::remove(nullptr, nullptr, 1);
+
+ auto RemoveIfRetval = std::remove_if(nullptr, nullptr, nullptr);
+
+ auto UniqueRetval = std::unique(nullptr, nullptr);
+
+ // test using the return value in different kinds of expressions
+ useFuture(std::async(increment, 42));
+ std::launder(&FNoWarning)->f();
+ delete std::launder(&FNoWarning);
+
+ if (std::launder(&FNoWarning))
+ ;
+ for (; std::launder(&FNoWarning);)
+ ;
+ while (std::launder(&FNoWarning))
+ ;
+ do
+ ;
+ while (std::launder(&FNoWarning));
+ switch (std::unique(1, 1))
+ ;
+
+ // cast to void should allow ignoring the return value
+ (void)std::async(increment, 42);
+
+ // test discarding return value of functions that are not configured to be checked
+ increment(1);
+
+ // test that the check is disabled inside GNU statement expressions
+ ({ std::async(increment, 42); });
+ auto StmtExprRetval = ({ std::async(increment, 42); });
+}
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