Implicit enum conversions are a stupid PITA

[Walter Bright]

Ellery Newcomer wrote:
> I guess what I'm trying to say is it doesn't make sense that I can 
> implicitly import FooA, an external symbol, but not bar(FooA), an 
> external symbol defined on an external symbol which cannot be implicitly 
> converted to a local symbol.

And I believe it makes perfect sense! Everywhere else in the language, when you 
define a local name it *overrides* names in other scopes, it doesn't overload them.