[4.0] Handle IUO unwraps in key paths. #11005
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In the type checker, we need to recognize when a member lookup succeeded through an IUO unwrap, and insert the implicit optional-unwrap component into the key path. In the standard library, we need to cope with the fact that IUO is still a first-class type with unique type metadata in a few places. Fix for rdar://problem/33230845.
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@swift-ci Please test |
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@rudkx Does this look good for the 4.0 branch? |
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Explanation: The compiler would crash when a key path literal included an implicit unwrap of an IUO.
Scope: Fixes a crash using key paths with IUO properties
Issue: rdar://problem/33230845
Risk: Low, bug fix isolated to key paths
Testing: Swift CI