http://d.puremagic.com/issues/show_bug.cgi?id=3756

           Summary: std.traits.ReturnType broken for ref returns
           Product: D
           Version: 2.040
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: dsimcha@yahoo.com


--- Comment #0 from David Simcha <dsimcha@yahoo.com> 2010-01-30 15:54:58 PST ---
import std.traits;

ref uint foo(ref uint num) {
    return num;
}

pragma(msg, ReturnType!(foo));  // uint, not ref uint.

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http://d.puremagic.com/issues/show_bug.cgi?id=3756


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich@gmail.com
         Resolution|                            |FIXED


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-12-21 07:30:46 PST ---
Type modifiers can't be passed around in the language, but I think there's a separate issue already opened for this.

Anyway you can do:

import std.traits;

ref uint foo(ref uint num) {
    return num;
}

void main()
{
    alias FunctionAttribute FA;
    static assert(functionAttributes!foo & FA.ref_);
}

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