Bug report: selects rope in tables they shouldn't

Sorry for the unformatted bug report, I can't find the bug form on
postgresql.org.

Version: 7.0

Platform: Debian Linux (woody) running kernel 2.2.14

Question:
Is it valid syntax to refer to a table when it's not in the FROM of the
select?  It's producing awfully wierd output:

CREATE TABLE A (
    x integer
);

CREATE TABLE B(
    x integer
);

insert into A values (1);
insert into B values (2);

select * from A where B.x=2;

 x
---
 1
(1 row)

svan=# explain  select * from A where B.x=2;
NOTICE:  QUERY PLAN:

Nested Loop  (cost=0.00..322.50 rows=10000 width=8)
  ->  Seq Scan on b  (cost=0.00..22.50 rows=10 width=4)
  ->  Seq Scan on a  (cost=0.00..20.00 rows=1000 width=4)

EXPLAIN




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      (. .)
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| Stephen van Egmond  http://bang.dhs.org/