[Issue 21105] New: Casting from a function pointer to a delegate

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21105

          Issue ID: 21105
           Summary: Casting from a function pointer to a delegate
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dlang.org
          Assignee: nobody at puremagic.com
          Reporter: porton at narod.ru

Please add the following features:

- explicit casting from a function pointer to the corresponding delegate (with
the obvious semantics)
- implicit casting from a function pointer to the corresponding delegate
- `cast(delegate) ...` that would also do this cast.

The state would be set to null by such casts.

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