[Issue 20232] New: WhiteHole is unusable with @safe interface functions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20232

          Issue ID: 20232
           Summary: WhiteHole is unusable with @safe interface functions
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: andrej.mitrovich at gmail.com

```
import std.typecons;

interface I
{
    @safe:
    void foo ();
}

void main ()
{
    auto c = new WhiteHole!I;  // error
    auto c = new BlackHole!I;  // ok
}
```

/Library/D/dmd/src/phobos/std/typecons.d-mixin-4530(4535): Error: `@safe`
function `std.typecons.AutoImplement!(I, generateAssertTrap,
isAbstractFunction).AutoImplement.foo` cannot call `@system` constructor
`std.typecons.NotImplementedError.this`

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