[Issue 6910] New: __traits(hasMember, "<name>") does not work, if template has alias param

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6910

           Summary: __traits(hasMember, "<name>") does not work, if
                    template has alias param
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: tobias at pankrath.net


--- Comment #0 from Tobias Pankrath <tobias at pankrath.net> 2011-11-08 14:29:58 PST ---
Given this code fragment:

--------------
struct Bag(S...)
{
    alias S Types;
}

template Test(alias i, B)
{
    void fn() {
        foreach(t; B.Types)
        {
            switch(i) {
                case IndexOf!(t, B.Types):
                {
                    pragma(msg, __traits(allMembers, t));
                    pragma(msg, __traits(hasMember, t, "m"));
                    break;
                }
                default: {}
            }
        }
    }
}

struct A
{
    int m;
}


void main()
{

    int i;
    alias Test!(i, Bag!(A)).fn func;
}
----------------------

DMD will output:
----------------------
tuple("m")
false
---------------------

It seems that __traits(hasMember, ..) evaluates to false, despite the fact that
the type 
does have a member "m". However if the template Test does not have an alias
parameter, everything will work just fine.

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