tests/base_virtual_type_fixed.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 import kernel
  16
  17 interface A
  18         type V1: Object
  19         fun v1(v: V1): V1 do return v
  20         type V2: Object
  21         fun v2(v: V2): V2 do return v
  22 end
  23 interface B
  24         super A
  25         redef type V1: Discrete
  26         redef type V2: Discrete is fixed
  27 end
  28 class C
  29         super B
  30
  31         # Because of the workaround, there is no simple way to see the subtype relation
  32         #alt1#redef fun v1(v: Discrete): Discrete do return v
  33         redef fun v2(v: Discrete): Discrete do return v
  34 end
  35
  36 var c: A = new C
  37 c.v1(1).output
  38 c.v1(2).output