ccc write-up specifies:
"...the name of the variable may not be...redeclared as an exception parameter of a catch clause in a try statement of the directly enclosing method or initializer block"
but this code compiles without error:
public class negtest06 {
  String test1( ) {
    String ret = null;
    try {
      try ( java.io.FileInputStream str = new java.io.FileInputStream("foo.txt") ) {
        ret = str.getClass().getSimpleName();
      } catch( Exception str) {}
    } catch ( Exception str ) {}
    return ret;
  }
}