/*

 * @test /nodynamiccopyright/

 * @bug 8138840 8139243 8139249

 * @summary Compiler crashes when compiling bitwise operations with illegal operand types

 *          'void' is erroneously accepted as a possible operand for string concatenation

 * @compile/fail/ref=T8139243.out -XDrawDiagnostics T8139243.java

 */

class T8139243 {

    void test(String s) {

        s += m(); // compile time error

    }

    void m() { }

}