[Bug c++/87357] New: Bogus conversion with conversion function not detected

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87357

            Bug ID: 87357
           Summary: Bogus conversion with conversion function not detected
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

[class.conv.fct]:
A conversion function is never used to convert a (possibly cv-qualified) object
to the (possibly cv-qualified) same object type (or a reference to it), to a
(possibly cv-qualified) base class of that type (or a reference to it), or to
(possibly cv-qualified) void.

But:
$ cat q.C
struct X {
  operator X();
};
$ ./cc1plus -quiet q.C -Wconversion -Wall -Wextra -Wpedantic