tests/base_isa_vt_gen3.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: nullable Object
  21
  22         fun foo(o: Object): Bool do
  23                 return o isa T
  24         end
  25 end
  26
  27 class B[X]
  28         super A[X]
  29         redef type T: B[X]
  30 end
  31
  32 class C[X]
  33         super B[X]
  34         redef type T: C[X]
  35 end
  36
  37 var a = new A[Object]
  38 assert a.foo(new A[Object])
  39
  40 var b = new B[Object]
  41 assert not b.foo(new A[Object])
  42 assert b.foo(new B[Object])
  43 assert b.foo(new C[Object])
  44
  45 var c = new C[Object]
  46 assert not c.foo(new A[Object])
  47 assert not c.foo(new B[Object])
  48 assert c.foo(new C[Object])
  49 assert c.foo(new C[B[Object]])
  50 assert c.foo(new C[B[Bool]])
  51
  52 true.output