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Doug Gregor 67ca1c9ea1 Implement the new casting syntaxes "as" and "as?".

There's a bit of a reshuffle of the ExplicitCastExpr subclasses:
  - The existing ConditionalCheckedCastExpr expression node now represents
"as?". 
  - A new ForcedCheckedCastExpr node represents "as" when it is a
  downcast.
  - CoerceExpr represents "as" when it is a coercion.
  - A new UnresolvedCheckedCastExpr node describes "as" before it has
  been type-checked down to ForcedCheckedCastExpr or CoerceExpr. This
  wasn't a strictly necessary change, but it helps us detangle what's
  going on.

There are a few new diagnostics to help users avoid getting bitten by
as/as? mistakes:
  - Custom errors when a forced downcast (as) is used as the operand
  of postfix '!' or '?', with Fix-Its to remove the '!' or make the
  downcast conditional (with as?), respectively.
  - A warning when a forced downcast is injected into an optional,
  with a suggestion to use a conditional downcast.
  - A new error when the postfix '!' is used for a contextual
  downcast, with a Fix-It to replace it with "as T" with the
  contextual type T.

Lots of test updates, none of which felt like regressions. The new
tests are in test/expr/cast/optionals.swift. 

Addresses <rdar://problem/17000058>


Swift SVN r18556

2014-05-22 06:15:29 +00:00

AppKit

Implement the new casting syntaxes "as" and "as?".

2014-05-22 06:15:29 +00:00

CoreGraphics

Differentiate between user assertion and preconditions and the like

2014-05-16 20:49:54 +00:00

Darwin

Per design discussion today, rename UnsafePointer ".pointee" to ".memory".

2014-05-17 20:35:16 +00:00

Dispatch

Adjust test cases.