code: public void setBlockVariable( String name, Object value )
          throws UtilEvalError
      {
          super.setVariable( name, value, false/*strict?*/, false );
      }
docs: Set an untyped variable in the block namespace.
  The BlockNameSpace would normally delegate this set to the parent.
  Typed variables are naturally set locally.
  This is used in try/catch block argument.