[llvm-bugs] [Bug 35073] New: Unexpected -Wunused-value with -std=c++17

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35073

            Bug ID: 35073
           Summary: Unexpected -Wunused-value with -std=c++17
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: stephan.bergmann.secondary at googlemail.com
                CC: llvm-bugs at lists.llvm.org

At least with recent Clang trunk towards 6.0:

> $ cat test.cc
> struct B {};
> struct Ref { Ref(B *); };
> struct D: B { operator Ref() { return this; } };
> void f() { Ref(*new D); }
>
> $ clang++ -std=c++14 -fsyntax-only test.cc
>
> $ clang++ -std=c++17 -fsyntax-only test.cc
> test.cc:4:12: warning: expression result unused [-Wunused-value]
> void f() { Ref(*new D); }
>            ^   ~~~~~~
> 1 warning generated.

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