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// RUN: %target-typecheck-verify-swift -swift-version 4
func flatMapOnSequence<
S : Sequence
>(xs: S, f: (S.Element) -> S.Element?) {
_ = xs.flatMap(f) // expected-warning {{'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value}} expected-note {{compactMap}}
}
func flatMapOnLazySequence<
S : LazySequenceProtocol
>(xs: S, f: (S.Element) -> S.Element?) {
_ = xs.flatMap(f) // expected-warning {{'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value}} expected-note {{compactMap}}
}
func flatMapOnLazyCollection<
C : LazyCollectionProtocol
>(xs: C, f: (C.Element) -> C.Element?) {
_ = xs.flatMap(f) // expected-warning {{'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value}} expected-note {{compactMap}}
}
func flatMapOnLazyBidirectionalCollection<
C : LazyCollectionProtocol & BidirectionalCollection
>(xs: C, f: (C.Element) -> C.Element?)
where C.Elements : BidirectionalCollection {
_ = xs.flatMap(f) // expected-warning {{'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value}} expected-note {{compactMap}}
}
func flatMapOnCollectionOfStrings<
C : Collection
>(xs: C, f: (C.Element) -> String?) {
_ = xs.flatMap(f) // expected-warning {{'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value}} expected-note {{compactMap}}
}
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