src/test/groovy/bugs/Groovy9176.groovy

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package groovy.bugs

import groovy.transform.CompileStatic
import org.codehaus.groovy.control.CompilationFailedException
import org.junit.Test

import static groovy.test.GroovyAssert.shouldFail

@CompileStatic
final class Groovy9176 {

    @Test
    void testGroovyPropertyCovariantMethodCheck() {
        def err = shouldFail CompilationFailedException, '''
            class Pojo {
                private String title;
                public String getTitle() { return this.title; }
                public void setTitle(String title) { this.title = title; }
            }
            class Test extends Pojo {
                // property "title" with type that is incompatible with "String"
                java.util.regex.Pattern title
            }
        '''

        assert err =~ / The return type of java.util.regex.Pattern getTitle\(\) in Test is incompatible with java.lang.String in Pojo\n\. At \[9:17\] /
    }
}