1 # This file is part of NIT ( http://www.nitlanguage.org ).
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
7 # http://www.apache.org/licenses/LICENSE-2.0
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.
15 # Explain failed assert to the console (service declaration only)
17 # The only service `assert_expr_str` is implemented by the
18 # `explain_assert` module.
19 module explain_assert_api
23 redef class AAssertExpr
24 # Superstring explaining `self` if the assert fails
26 # Engines should print out this superstring.
27 fun explain_assert_str
: nullable ASuperstringExpr do return null