http://d.puremagic.com/issues/show_bug.cgi?id=10452

           Summary: CTFE: if(x is null) Error: cannot compare __lambda1 at
                    compile time
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: destructionator@gmail.com


--- Comment #0 from Adam D. Ruppe <destructionator@gmail.com> 2013-06-23 11:31:05 PDT ---
string foo(bool delegate() bar) {
        return (bar !is null) ? "0" : "1";
}

void main() {
        enum there = foo(() => true);
}

test12.d(2): Error: cannot compare __lambda1 at compile time
test12.d(7):        called from here: foo(bool()
{
return true;
}
)


I understand generally not being able to compare pointers in CTFE, but I think is null and !is null should be permitted wherever possible because that's something I do a lot: if(dg is null) return some_default; else return dg(); and it would be cool if it worked in ctfe too.

Failed on dmd v2.063

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |CTFE, rejects-valid
            Summary|CTFE: if(x is null) Error:  |CTFE: Cannot compare
                   |cannot compare __lambda1 at |delegates with == or 'is'
                   |compile time                |
           Severity|enhancement                 |normal


--- Comment #1 from Don <clugdbug@yahoo.com.au> 2013-07-18 07:18:55 PDT ---
This isn't an enhancement, it's a bug. All forms of delegate (null, delegate literal, nested function, struct member, class member) should be comparable with == and 'is'.

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--- Comment #2 from Don <clugdbug@yahoo.com.au> 2013-07-19 00:47:54 PDT ---
https://github.com/D-Programming-Language/dmd/pull/2360

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--- Comment #3 from github-bugzilla@puremagic.com 2013-07-21 11:38:16 PDT ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/48385f97a2604c87fed590a1b091c387183a5167 Fix issue 10452 cannot compare delegates in CTFE

Support == and 'is' for delegates.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |FIXED


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