// RUN: %target-typecheck-verify-swift -debug-generic-signatures 2>&1 | %FileCheck %s

// https://github.com/apple/swift/issues/56248

// CHECK: Requirement signature: <Self where Self.[P1]A : P2>
protocol P1 {
  associatedtype A: P2
}

// CHECK: Requirement signature: <Self>
protocol P2 {
  associatedtype A
}

// Neither one of 'P3', 'P4' or 'f()' should have diagnosed
// redundant conformance requirements.

// CHECK: Requirement signature: <Self where Self : P2, Self == Self.[P2]A.[P1]A, Self.[P2]A : P1>
protocol P3 : P2 where Self.A: P1, Self.A.A == Self { }

// CHECK: Requirement signature: <Self where Self.[P4]X : P2, Self.[P4]X == Self.[P4]X.[P2]A.[P1]A, Self.[P4]X.[P2]A : P1>
protocol P4 {
  associatedtype X where X : P2, X.A: P1, X.A.A == X
}

// CHECK: Generic signature: <T where T : P2, T == T.[P2]A.[P1]A, T.[P2]A : P1>
func f<T : P2>(_: T) where T.A : P1, T.A.A == T { }