[Issue 21545] [dip1000] cannot assign ref returning delegate to variable with lower attributes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21545

--- Comment #2 from ag0aep6g <ag0aep6g at 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

--