[Issue 15839] this.outer is of wrong type

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15839

--- Comment #1 from Kenji Hara <k.hara.pg at gmail.com> ---
This is an intentional bugfix introduced by fixing issue 14442.

Note that there was accepts-invalid bug. The spec page
http://dlang.org/spec/class said:

> The property .outer used in a nested class gives the this pointer to its enclosing class. If the enclosing context is not a class, the .outer will give the pointer to it as a void* type.

It means `this.outer` in `run()` member function should represent the frame of
'start' function. Actually the generated code is following the spec, but
front-end had incorrectly typed 'this.outer' like an AnimatedProgress class.

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