Andrew Trick fe326266cc [exclusivity] Add a [builtin] flag to begin_[unpaired_]access. ...

This flag supports promoting KeyPath access violations to an error in
Swift 4+, while building the standard library in Swift 3 mode. This is
only necessary as long as the standard library continues to build in
Swift 3 mode. Once the standard library build migrates, it can all be
ripped out.

<rdar://problem/40115738> [Exclusivity] Enforce Keypath access as an error, not a warning in 4.2.

2018-05-09 21:42:37 -07:00

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