// RUN: %target-sil-opt %s | %FileCheck %s

import Swift

public protocol mmOutputStreamType {
  /// Append the given `string` to this stream.
  mutating func write(string: String)
}

public protocol mmStreamable {
  func writeTo<Target : mmOutputStreamType>(target: inout Target)
}

// CHECK-LABEL: sil @test : $@convention(thin) () -> () {
sil @test : $() -> () {
bb0:
  %281 = alloc_stack $mmStreamable
  %282 = open_existential_addr mutable_access %281 : $*mmStreamable to $*@opened("01234567-89ab-cdef-0123-000000000000") mmStreamable
  // CHECK: witness_method $@opened({{.*}}) mmStreamable, #mmStreamable.writeTo!1
  %293 = witness_method $@opened("01234567-89ab-cdef-0123-000000000000") mmStreamable, #mmStreamable.writeTo!1, %282 : $*@opened("01234567-89ab-cdef-0123-000000000000") mmStreamable : $@convention(witness_method: mmStreamable) @callee_owned <T_0_0, T_1_0 where T_0_0 : mmStreamable, T_1_0 : mmOutputStreamType> (@inout T_1_0, @inout T_0_0) -> ()
  dealloc_stack %281 : $*mmStreamable
  %1 = tuple ()
  return %1 : $()
}