https://issues.dlang.org/show_bug.cgi?id=21545
--- Comment #2 from ag0aep6g <ag0ae...@gmail.com> --- (In reply to ag0aep6g from comment #1) > int i; > auto dg = delegate ref() @safe => i; > > alias DgFull = ref int delegate() pure nothrow @nogc @safe; > alias DgAuto = typeof(dg); > > pragma(msg, DgFull); /* int delegate() pure nothrow @nogc ref @safe */ > pragma(msg, DgAuto); /* int delegate() pure nothrow @nogc ref @safe */ > pragma(msg, is(DgFull == DgAuto)); /* true; okay */ `DgAuto` actually also has the attributes`scope` and `return`, but they have a special "inferred" marker. That means they're not printed.[1] Apparently, the marker also has an effect on `is(X == Y)`. Still bizarre. [1] https://github.com/dlang/dmd/blob/f341be3de711f9dbb91011e3650f8afc3818ec25/src/dmd/mtype.d#L7131-L7134 --