[Bug c++/67240] New: [concepts] Implicit conversion constraints are not respected

[Bug c++/67240] New: [concepts] Implicit conversion constraints are not respected

[sebi707 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67240

            Bug ID: 67240
           Summary: [concepts] Implicit conversion constraints are not
                    respected
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sebi707 at gmail dot com
  Target Milestone: ---

Using the trailing return type to add constraints does not work in some cases.
The following code should not compile:

int foo(int x)
{
    return x;
}

template <typename T>
concept bool C1 = requires (T x) {
    {foo(x)} -> int&;
};

template <typename T>
concept bool C2 = requires (T x) {
    {foo(x)} -> void;
};

static_assert( C1<int> );
static_assert( C2<int> );

However this compiles just fine with r226884.

[Bug c++/67240] [concepts] Implicit conversion constraints are not respected

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67240

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-08-17
     Ever confirmed|0                           |1

[Bug c++/67240] [concepts] Implicit conversion constraints are not respected

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67240

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |6.0

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.

[Bug c++/67240] [concepts] Implicit conversion constraints are not respected

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67240

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri Aug 21 18:33:07 2015
New Revision: 227081

URL: https://gcc.gnu.org/viewcvs?rev=227081&root=gcc&view=rev
Log:
        PR c++/67240
        * constraint.cc (satisfy_implicit_conversion_constraint): Also
        check for NULL_TREE.

Added:
    trunk/gcc/testsuite/g++.dg/concepts/iconv1.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constraint.cc