[Issue 22041] New: SumType assignments should work with pointers in @safe code

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22041

          Issue ID: 22041
           Summary: SumType assignments should work with pointers in @safe
                    code
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Keywords: safe
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: lsferreira169 at gmail.com

Pretty much self-explainatory.

This should work in @safe code:

```d
alias FooBar = SumType!(int*);
auto foobar = FooBar(new int);
foobar = FooBar(new int);
```

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