// RUN: %target-swift-frontend -emit-ir %s | %FileCheck %s
sil_stage canonical

enum Optional<T> { case some(T), none }

class AClass {
}

protocol AProto {
}

enum AnEnum {
    case ACase(a: AClass, b: AProto)
}

// CHECK-LABEL: define {{.*}} @switch_singleton_enum_in_optional
// CHECK:         [[CAST:%.*]] = bitcast {{.*}} %0 to { [[WORD:i[0-9]+]], [[WORD]], [[WORD]], [[WORD]], [[WORD]], [[WORD]] }*
// CHECK:         [[GEP:%.*]] = getelementptr {{.*}} %1, i32 0, i32 0
// CHECK:         [[FIRSTWORD:%.*]] = load [[WORD]], [[WORD]]* [[GEP]]
// CHECK:         [[TEST:%.*]] = icmp eq [[WORD]] [[FIRSTWORD]], 0
// CHECK:         br i1 [[TEST]]
sil public @switch_singleton_enum_in_optional :
    $@convention(thin) (@in Optional<AnEnum>) -> () {
entry(%a : $*Optional<AnEnum>):
  switch_enum_addr %a : $*Optional<AnEnum>,
    case #Optional.some!enumelt: some,
    case #Optional.none!enumelt: none
some:
  unreachable
none:
  unreachable
}

sil_vtable AClass {}