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// RUN: %target-swift-frontend -emit-silgen %s
// TF-1180: SIL verification error regarding `@differentiable` class method
// witnesses for `@differentiable` protocol requirements.
import _Differentiation
protocol Protocol {
@differentiable(reverse)
func method(_ x: Float) -> Float
}
class Class: Protocol {
@differentiable(reverse)
public func method(_ x: Float) -> Float { x }
}
// Original error:
// SIL verification failed: method does not appear in the class's vtable: VerifyClassMethodVisitor(member).Seen
// Verifying instruction:
// %2 = load_borrow %1 : $*Class // users: %8, %4, %3
// -> %3 = class_method %2 : $Class, #Class.method!jvp.SU.<Self where Self : Protocol> : (Class) -> (Float) -> Float, $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %4
// %4 = apply %3(%0, %2) : $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %5
// In function:
// // AD__$s4main5ClassCAA8ProtocolA2aDP6methodyS2fFTW_jvp_SU
// sil private [transparent] [thunk] [ossa] @AD__$s4main5ClassCAA8ProtocolA2aDP6methodyS2fFTW_jvp_SU : $@convention(witness_method: Protocol) (Float, @in_guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
// // %0 // user: %4
// // %1 // user: %2
// bb0(%0 : $Float, %1 : $*Class):
// %2 = load_borrow %1 : $*Class // users: %8, %4, %3
// %3 = class_method %2 : $Class, #Class.method!jvp.SU.<Self where Self : Protocol> : (Class) -> (Float) -> Float, $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %4
// %4 = apply %3(%0, %2) : $@convention(method) (Float, @guaranteed Class) -> (Float, @owned @callee_guaranteed (Float) -> Float) // user: %5
// (%5, %6) = destructure_tuple %4 : $(Float, @callee_guaranteed (Float) -> Float) // users: %7, %7
// %7 = tuple (%5 : $Float, %6 : $@callee_guaranteed (Float) -> Float) // user: %9
// end_borrow %2 : $Class // id: %8
// return %7 : $(Float, @callee_guaranteed (Float) -> Float) // id: %9
// } // end sil function 'AD__$s4main5ClassCAA8ProtocolA2aDP6methodyS2fFTW_jvp_SU'
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