Slava Pestov f63dff16c7 AST: Don't allow @_transparent on extensions ...

Quiz: What does @_transparent on an extension actually *do*?

1) Make all members @_transparent?
2) Allow your members to be @_transparent?
3) Some other magical effect that has nothing to do with members?

The correct answer is 1), however a few places in the stdlib defined
a @_transparent extension and then proceeded to make some or all members
also @_transparent, and in a couple of places we defined a @_transparent
extension with no members at all.

To avoid cargo culting and confusion, remove the ability to make
@_transparent extensions altogether, and force usages to be explicit.

2016-11-01 21:14:09 -07:00

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