member of a oneof/struct/class/extension to support types nested
within generic classes, e.g., Vector<Int>.ElementRange.
Most importantly, nominal types are no longer inherently canonical. A
nominal type refers to both a particular nominal type declaration as
well as its parent, which may be non-canonical and will vary. For
example, the variance in the parent makes Vector<Int>.ElementRange and
Vector<Float>.ElementRange different types.
Introduce deduction and substitution for nominal types. Deduction is
particular interesting because we actually do allow deduction of T
when comparing X<T>.Inner and X<Int>.Inner, because (unlike C++) there
is no specialization to thwart us.
Swift SVN r2507
polymorphic type when that type is nested within a generic type. The
type-checker still isn't ready to use these declarations in a sane way.
Swift SVN r2501
protocol Document { var title : String }
protocol Versioning { func bumpVersion() }
protocol VersionedDocument : Document, Versioning { }
This commit covers the basic functionality of protocol inheritance, including:
- Parsing & AST representation
- Conforming to a protocol also requires conforming to its inherited
protocols
- Member lookup into a protocol also looks into its inherited
protocols (results are aggregated; there is no name hiding)
- Teach ErasureExpr to maintain lvalueness, so we don't end up
performing a silly load/erase/materialize dance when accessing
members from an inherited protocol.
Swift SVN r1804
