parse
BEGIN
  NULL;
  IF foo THEN
    NULL;
  ELSE
    NULL;
  END IF;
  NULL;
END
----
BEGIN
NULL;
IF foo THEN
	NULL;
ELSE
	NULL;
END IF;
NULL;
END;
 -- normalized!
BEGIN
NULL;
IF (foo) THEN
	NULL;
ELSE
	NULL;
END IF;
NULL;
END;
 -- fully parenthesized
BEGIN
NULL;
IF foo THEN
	NULL;
ELSE
	NULL;
END IF;
NULL;
END;
 -- literals removed
BEGIN
NULL;
IF _ THEN
	NULL;
ELSE
	NULL;
END IF;
NULL;
END;
 -- identifiers removed
