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These will never work properly because of phase ordering issues with the current declaration checker design. Since we can always express the same thing with the protocol inheritance clause instead, just diagnose this as an error instead of trying to hack around it. Fixes <rdar://problem/38077232>, <https://bugs.swift.org/browse/SR-5581>.
30 lines
961 B
Swift
30 lines
961 B
Swift
// RUN: %target-typecheck-verify-swift
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// rdar://problem/31401161
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class C1 {}
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protocol P1 {
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associatedtype Element
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}
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protocol P2 : P1 {
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associatedtype SubSequence : P1 // expected-note{{'SubSequence' declared here}}
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}
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protocol P3 : P2 {
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associatedtype SubSequence : P2 // expected-warning{{redeclaration of associated type 'SubSequence' from protocol 'P2' is better expressed as a 'where' clause on the protocol}}
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}
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func foo<S>(_: S) where S.SubSequence.Element == C1, S : P3 {}
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// Invalid where clauses
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protocol InvalidWhereClause1 where Self: AnyObject {}
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// expected-error@-1 {{constraint with subject type of 'Self' is not supported; consider adding requirement to protocol inheritance clause instead}}
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class AlsoBad {}
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protocol InvalidWhereClause2 {
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associatedtype T where Self: AlsoBad
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// expected-error@-1 {{constraint with subject type of 'Self' is not supported; consider adding requirement to protocol inheritance clause instead}}
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}
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