grex 1.4.6

grex generates regular expressions from user-provided test cases.
Documentation 
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/*
 * Copyright © 2019-today Peter M. Stahl pemistahl@gmail.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either expressed or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

macro_rules! btreeset {
    ( $( $value: expr ),* ) => {{
        let mut set = std::collections::BTreeSet::new();
        $( set.insert($value); )*
        set
    }};
}