psql dumps core when entering invalid backslash command

Lukas Ertl (l.ertl@univie.ac.at) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
psql dumps core when entering invalid backslash command

Long Description
PostgreSQL v. 7.1.1., running on FreeBSD 4.3, standard installation via the ports collection.

When entering an invalid backslash command in psql (like "\m"), psql dumps core, psql gives error "Invalid command", but then dumps core.

Sample Code
httplog=# \m
Invalid command \m. Try \? for help.
Segmentation fault (core dumped)

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