tests/base_isa_vt2.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2012 Alexandre Terrasa <alexandre@moz-code.org>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 import base_minimal
  18
  19 class A[X]
  20         type T: X
  21         type U: T
  22
  23         fun testT(o: Object): Bool do
  24                 return o isa T
  25         end
  26
  27         fun testU(o: Object): Bool do
  28                 return o isa U
  29         end
  30
  31 end
  32
  33 var a = new A[Object]
  34
  35 assert a.testT(true)
  36 assert a.testT(a)
  37
  38 assert a.testU(true)
  39 assert a.testU(a)
  40
  41 true.output