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From: "barry.revzin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/66108] New: cv-qualification deducation failure on conversion operator
Date: Mon, 11 May 2015 16:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66108

            Bug ID: 66108
           Summary: cv-qualification deducation failure on conversion
                    operator
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: barry.revzin at gmail dot com
  Target Milestone: ---

Consider this code (taken from SO question)

#include <iostream>

struct A {
    template <class T> operator T***()
    {
        static_assert(std::is_same<T, int>::value, "oops");
    }
};

int main(){
    A a;
    const int * const * const * p1 = a;
}

This is exactly the example taken from the standard in [temp.deduct.conv]/7,
yet on gcc 5.1, the static assertion fails because T is deduced as const int
rather than int.