File: simplify_begin_apply.sil

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// RUN: %target-sil-opt -enable-sil-verify-all %s -onone-simplification -simplify-instruction=begin_apply | %FileCheck %s

// REQUIRES: swift_in_compiler

sil_stage canonical

import Builtin
import Swift
import SwiftShims

class Bar {
  init()
  @_borrowed @_hasStorage var field: Int { get set }
}

// CHECK-LABEL: sil @devirt_class_method :
// CHECK:         [[F:%.*]] = function_ref @bar_field_read
// CHECK:         begin_apply [[F]]
// CHECK:       } // end sil function 'devirt_class_method'
sil @devirt_class_method : $@convention(thin) () -> (Int, @error any Error) {
bb0:
  %0 = alloc_ref $Bar
  %1 = class_method %0 : $Bar, #Bar.field!read : (Bar) -> () -> (), $@yield_once @convention(method) (@guaranteed Bar) -> @yields Int
  (%2, %3) = begin_apply %1(%0) : $@yield_once @convention(method) (@guaranteed Bar) -> @yields Int
  end_apply %3 as $()
  return %2 : $Int
}

sil @bar_field_read : $@yield_once @convention(method) (@guaranteed Bar) -> @yields Int

sil_vtable Bar {
  #Bar.field!read: @bar_field_read
}