Bug #828: psql in 7.3 can't talk to 7.1 backends

Philip Warner (pjw(at)rhyme(dot)com(dot)au) reports a bug with a severity of 4
The lower the number the more severe it is.

Short Description
psql in 7.3 can't talk to 7.1 backends

Long Description
acheron:/home/pjw/work/postgresql-7.3/src/bin/pg_dump # /var/lib/pgsql-7.3/bin/psql -p 5432 pjw
ERROR: parser: parse error at or near "."
Welcome to psql 7.3, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

pjw=> \d
ERROR: parser: parse error at or near "."
pjw=>\l
ERROR: parser: parse error at or near "("
pjw=>

Maybe this is a locale thing; but ISTM it should issue a more meaningful message or refuse to connect.

Sample Code

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