[Issue 11554] New: `is(T == enum); ` produces an error if T is an enum defined with no members

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https://d.puremagic.com/issues/show_bug.cgi?id=11554

           Summary: `is(T == enum);` produces an error if T is an enum
                    defined with no members
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: blah38621 at gmail.com


--- Comment #0 from Orvid King <blah38621 at gmail.com> 2013-11-19 09:31:10 PST ---
The following code now produces an error, when it previously produced no error.
The error can be eliminated by adding a member to the enum, but that's not how
every enum that I've seen that's intended as a UDA is declared.

enum isEnum(T) = is(T == enum);
@safe pure nothrow unittest
{
    enum AnEnum;    
    static assert(isEnum!AnEnum, "Failed to determine that AnEnum is an
enum!");
}

And now the error:
std/traitsExt.d(43): Error: enum std.traitsExt.__unittestL44_9.AnEnum is
forward referenced looking for base type.


As far as I can tell, it was caused by the commit merged in
https://github.com/D-Programming-Language/dmd/pull/2795. However, without some
fun with git I can't be certain, but it's the only commit dealing with enums in
the last 2 days, before which this code compiled without error.

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