message: checker_instantiation was missing a semicolon in grammar
  As per section 17.3 of the standard, checker instantiation is terminated
  with a semicolon. Lack of it adds am unexpected empty statment_or_null
  in the hierarchy.
diff: @@ -1964,7 +1964,7 @@ named_port_connection
  ;
  checker_instantiation
  - : ps_identifier name_of_instance OPEN_PARENS list_of_checker_port_connections CLOSE_PARENS
  + : ps_identifier name_of_instance OPEN_PARENS list_of_checker_port_connections CLOSE_PARENS SEMICOLON
  ;
  list_of_checker_port_connections
  