[Issue 17899] New: Cannot initialise contextless delegate at compile time

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17899

          Issue ID: 17899
           Summary: Cannot initialise contextless delegate at compile time
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: iamthewilsonator at hotmail.com

module foo;

void delegate() bar = (){};

complains about requiring a context for the initialisation that is unavailable
at compile time.

The assignment to bar (and all delegates) at compile time has no context (can
only refer to [thread local] globals by value) and so should compile with the
context pointer = null.

This would remove the necessity for module constructors to do the assignment.

It would also solve https://github.com/libmir/dcompute/issues/32 where the
module constructors fail to initialise the delegates properly, which is a
separate issue that I haven't been able to pin down (not yet reported).

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