src/test/groovy/InterfaceTest.groovy

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package groovy

import gls.CompilableTestSupport

class InterfaceTest extends CompilableTestSupport {

    void testGenericsInInterfaceMembers() {
        // control
        shouldCompile """
        interface I1 {
            public <T> T copy1(T arg)
            public <U extends CharSequence> U copy2(U arg)
            public <V, W> V copy3(W arg)
            public <N extends Number> void foo()
        }
        """
        // erroneous
        shouldNotCompile "interface I2 { public <?> copy1(arg) }"
        shouldNotCompile "interface I3 { public <? extends CharSequence> copy1(arg) }"
    }
}