Slava Pestov 4ebac86895 AST: Type::subst(): try harder to preserve sugar ...

If a sugared type desugars to a substitutable type, we would
return the replacement type without the sugar. I think in
practice this meant that ParenType would be lost sometimes.

Preserving this correctly is required for an upcoming CSDiag
change.

Note that there's a minor source-breaking change with enum
case constructors here. I've filed <rdar://problem/27261929>
to track sorting it out in Swift 3 mode.

Also an upcoming patch fixes another related issue and adds more
tests for case constructors.

2016-11-29 03:05:28 -07:00

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