Someone's broken psql's connection-failure error reporting

In CVS tip, I'm getting only an empty string from psql where it should
print connection-failure messages.

psql 7.3 does this:

$ psql -p 5555
psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5555"?
$

CVS tip does this:

$ psql -p 5555
psql: $

Have not dug to see if this is the fault of libpq or psql; but there's
been a fair amount of hacking lately in libpq's connection handling ...

regards, tom lane