Many regress tests failing due to latest psql changes

It looks like the latest psql has a buffer-flush-timing problem.
Error messages are appearing out-of-sync with script echoing,
for example:

*** expected/boolean.out Sat Jan 8 19:31:26 2000
--- results/boolean.out Thu Jan 13 20:41:24 2000
***************
*** 111,118 ****
-- This is now an invalid expression
-- For pre-v6.3 this evaluated to false - thomas 1997-10-23
INSERT INTO BOOLTBL2 (f1)
- VALUES (bool 'XXX');
ERROR: Bad boolean external representation 'XXX'
-- BOOLTBL2 should be full of false's at this point
SELECT '' AS f_4, BOOLTBL2.*;
f_4 | f1
--- 111,118 ----
-- This is now an invalid expression
-- For pre-v6.3 this evaluated to false - thomas 1997-10-23
INSERT INTO BOOLTBL2 (f1)
ERROR: Bad boolean external representation 'XXX'
+ VALUES (bool 'XXX');
-- BOOLTBL2 should be full of false's at this point
SELECT '' AS f_4, BOOLTBL2.*;
f_4 | f1

This is making it difficult to look for actual backend bugs,
so I respectfully request a fix ASAP.

regards, tom lane