[Bug c++/64562] Member functions with r-value reference for *this and deduced return type incorrectly rejected as ambiguous

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64562

Ville Voutilainen <ville.voutilainen at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-01-12
                 CC|                            |ville.voutilainen at gmail dot 
com
     Ever confirmed|0                           |1
      Known to fail|                            |4.8.2, 4.9.1, 5.0

--- Comment #1 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Reducing the test slightly, removing iostreams:

#define RETURN_TYPE auto

namespace {

struct S {
  RETURN_TYPE operator--() && {
    return 1;
  }

  RETURN_TYPE operator--() const && {
    return 2;
  }

  RETURN_TYPE operator--() & {
    return 3;
  }

  RETURN_TYPE operator--() const & {
    return 4;
  }
};

const S callme() { return {}; }

auto f1() {
  return --S();
}

auto f2() {
  return --callme();
}

auto f3() {
  S s;
  return --s;
}

auto f4() {
  const S s {};
  return --s;
}

}

int main() {
  f1();
  f2();
  f3();
  f4();
}