parse
DECLARE
BEGIN
  CLOSE some_cursor;
END
----
DECLARE
BEGIN
CLOSE some_cursor;
END;
 -- normalized!
DECLARE
BEGIN
CLOSE some_cursor;
END;
 -- fully parenthesized
DECLARE
BEGIN
CLOSE some_cursor;
END;
 -- literals removed
DECLARE
BEGIN
CLOSE _;
END;
 -- identifiers removed
