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swift-mirror/test/Generics/redundant_requirement_self_conforming_protocol.swift

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Swift

// RUN: %target-typecheck-verify-swift
// RUN: %target-swift-frontend -typecheck -debug-generic-signatures %s 2>&1 | %FileCheck %s
struct G<T> {}
// CHECK-LABEL: Generic signature: <T where T == Error>
extension G where T : Error, T == Error {}
// expected-warning@-1 {{redundant conformance constraint 'T' : 'Error'}}
// expected-note@-2 {{conformance constraint 'T' : 'Error' implied here}}