Error messages crash backend

Some time in the last 48 hours, a problem was introduced that causes
any attempt at an error message to crash the backend:

| barsoom:tih> createdb
| barsoom:tih> psql
| Welcome to the POSTGRESQL interactive sql monitor:
|   Please read the file COPYRIGHT for copyright terms of POSTGRESQL
|
|    type \? for help on slash commands
|    type \q to quit
|    type \g or terminate with semicolon to execute query
|  You are currently connected to the database: tih
|
| tih=> dfsasdfa;
| pqReadData() -- backend closed the channel unexpectedly.
|         This probably means the backend terminated abnormally before
| or while processing the request.
| We have lost the connection to the backend, so further processing is
| impossible.  Terminating.
| barsoom:tih>

I did 'gmake distclean', 'cvs update', 'configure', 'gmake all',
'gmake install', 'initdb', 'postmaster -i -S' and 'createuser tih'
just before what's logged above, so it was in a pristine environment.

-tih
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