PL/pgSQL PERFORM with CTE

Hackers,

This seems reasonable:
   david=# DO $$   david$# BEGIN   david$#     WITH now AS (SELECT now())   david$#     SELECT * from now;   david$#
END;  david$# $$;   ERROR:  query has no destination for result data   HINT:  If you want to discard the results of a
SELECT,use PERFORM instead.   CONTEXT:  PL/pgSQL function inline_code_block line 3 at SQL statement 

This not so much:
   david=# DO $$   david$# BEGIN   david$#     WITH now AS (SELECT now())   david$#     PERFORM * from now;   david$#
END;  david$# $$;   ERROR:  syntax error at or near "PERFORM"   LINE 4:     PERFORM * from now;               ^ 
Parser bug in PL/pgSQL, perhaps?

Best,

David