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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/52288] operator?: and lambdas error message could be better
Date: Fri, 06 Aug 2021 03:27:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D52288

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-08-06
            Summary|Trouble with operator?: and |operator?: and lambdas
                   |lambdas                     |error message could be
                   |                            |better

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #6)
> G++ will now say
>=20
> wa.C:3:17: error: operands to ?: have different types =E2=80=98main(int,
> char**)::<lambda(int)>=E2=80=99 and =E2=80=98main(int, char**)::<lambda(i=
nt)>=E2=80=99
>=20
> I think that addresses the ?: part of this issue.  I'll leave it open for
> now in case we want to keep it as a question about how to name lambdas in
> error messages.  It seems to me that we might want to omit the function
> scope if we're currently in the same function.  Do we want to give them
> numbers to distinguish them?

This is how clang does their names of the lambdas in error message:
<source>:4:17: error: incompatible operand types ('(lambda at <source>:4:19=
)'
and '(lambda at <source>:5:9)')
    void* p =3D b ? [argc](int i){ return i; } :
                ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~

Maybe we can do the same.=