[Bug c++/112456] New: Diagnostic for [[nodiscard]] on a constructor could be improved

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112456

            Bug ID: 112456
           Summary: Diagnostic for [[nodiscard]] on a constructor could be
                    improved
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

struct S {
  [[nodiscard]] S() { }
};

void f()
{
  S();
}


This correctly warns:

nod.cc: In function 'void f()':
nod.cc:7:6: warning: ignoring return value of 'S::S()', declared with attribute
'nodiscard' [-Wunused-result]
    7 |   S();
      |      ^
nod.cc:2:17: note: declared here
    2 |   [[nodiscard]] S() { }
      |                 ^


But the text could be improved because a constructor does not have a return
value.

Maybe "ignoring temporary object constructed by 'S::S()', declared with ...