| // RUN: %target-typecheck-verify-swift | |
| // rdar://problem/31401161 | |
| class C1 {} | |
| protocol P1 { | |
| associatedtype Element | |
| } | |
| protocol P2 : P1 { | |
| associatedtype SubSequence : P1 // expected-note{{'SubSequence' declared here}} | |
| } | |
| protocol P3 : P2 { | |
| associatedtype SubSequence : P2 // expected-warning{{redeclaration of associated type 'SubSequence' from protocol 'P2' is better expressed as a 'where' clause on the protocol}} | |
| } | |
| func foo<S>(_: S) where S.SubSequence.Element == C1, S : P3 {} |