[Issue 6404] New: Cannot check ref-ness of auto ref parameter in template constraint

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6404

           Summary: Cannot check ref-ness of auto ref parameter in
                    template constraint
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2011-07-29 22:20:45 PDT ---
Cannot compile following code:

// receive only rvalue
void rvalue(T)(auto ref T x) if (!__traits(isRef, x)) {}

// receive only lvalue
void lvalue(T)(auto ref T x) if ( __traits(isRef, x)) {}

void main()
{
    int n;

    static assert(!__traits(compiles, rvalue(n)));
    static assert( __traits(compiles, rvalue(0)));

    static assert( __traits(compiles, lvalue(n)));
    static assert(!__traits(compiles, lvalue(0)));
}

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