[Issue 10197] New: [REG2.063] Cannot cast overloaded template property result

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10197

           Summary: [REG2.063] Cannot cast overloaded template property
                    result
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: regression
          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> 2013-05-28 23:31:25 PDT ---
From: http://forum.dlang.org/post/pjgyejdfumdpupgjjajv@forum.dlang.org

This code should work, but doesn't.

template OriginalType(T)
{
    static if (is(T U == enum))
        alias OriginalType = U;
    else
        static assert(0);
}

enum E : int { F = -20 }
struct S
{
    int val;
    @trusted @property T as(T)()
    if (is(T == int) && !is(T == enum))
    {
        return cast(T)(val);
    }
    @trusted @property T as(T)()
    if (is(T == enum))
    {
        return cast(T)as!(OriginalType!T);  // L21
    }
}
void main()
{
    S val = S(-20);
    assert(val.as!int == -20);
    assert(val.as!E == E.F);    // L28
}

output:
test.d(21): Error: cannot cast this.as!(OriginalType!(T))
test.d(28): Error: template instance test.S.as!(E) error instantiating

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