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
INSERTINTO BOOLTBL2 (f1) 
 
-    VALUES (bool 'XXX');   ERROR:  Bad boolean external representation 'XXX' -- BOOLTBL2 should be full of false's at
thispoint  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
INSERTINTO 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