Bug 10452 – CTFE: Cannot compare delegates with == or 'is'

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

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'.

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.