http://d.puremagic.com/issues/show_bug.cgi?id=10871

           Summary: Typedef doesn't work with is null
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: john.loughran.colvin@gmail.com


--- Comment #0 from John Colvin <john.loughran.colvin@gmail.com> 2013-08-22 23:05:22 BST ---
import std.typecons;

alias Typedef!(void*) VP;

void main()
{
    VP vp;
    assert(vp is null);  //won't compile
}

Error: incompatible types for ((vp) is (null)): 'Typedef!(void*, null)' and
'typeof(null)'

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich@gmail.com


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-08-22 15:09:02 PDT ---
I'm not sure how we could implement this, we don't have an "opIs" operator.

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--- Comment #2 from John Colvin <john.loughran.colvin@gmail.com> 2013-08-22 23:17:08 BST ---
(In reply to comment #1)
> I'm not sure how we could implement this, we don't have an "opIs" operator.

yeah I have no idea either.


Is there any other way of getting something like a type-safe alias?

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