File: derived_differentiable_diagnostics.swift

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// RUN: %target-swift-frontend -typecheck -verify %s

import _Differentiation

protocol TangentVectorP: Differentiable {
  // expected-note @+1 {{protocol requires property 'requirement' with type 'Int'; add a stub for conformance}}
  var requirement: Int { get }
}

protocol TangentVectorConstrained: Differentiable where TangentVector: TangentVectorP {}

struct StructWithTangentVectorConstrained: TangentVectorConstrained {
  var x: Float
}
// expected-error @-1 {{type 'StructWithTangentVectorConstrained.TangentVector' does not conform to protocol 'TangentVectorP'}}