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de66b0c25c
Introduce a warning about redeclaring the associated types from an inherited protocol in the protocol being checked: * If the new declaration is an associated type, note that the declaration could be replaced by requirements in the protocol's where clause. * If the new declaration is a typealias, note that it could be replaced by a same-type constraint in the protocol's where clause.
21 lines
804 B
Swift
21 lines
804 B
Swift
// RUN: %target-typecheck-verify-swift
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// rdar://problem/23149063
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protocol P0 { }
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protocol P {
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associatedtype A // expected-note{{declared here}}
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}
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protocol Q : P {
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associatedtype A // expected-warning{{redeclaration of associated type 'A' from protocol 'P' is better expressed as a 'where' clause on the protocol}}
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}
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func f<T>(t: T) where T : P, T : Q, T.A : P0 { } // expected-note{{'f(t:)' previously declared here}}
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// expected-warning@-1{{redundant conformance constraint 'T': 'P'}}
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// expected-note@-2{{conformance constraint 'T': 'P' implied here}}
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func f<T>(t: T) where T : Q, T : P, T.A : P0 { } // expected-error{{invalid redeclaration of 'f(t:)'}}
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// expected-warning@-1{{redundant conformance constraint 'T': 'P'}}
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// expected-note@-2{{conformance constraint 'T': 'P' implied here}}
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