timestamp literal out of line

Version: 8.3.9

I was surprised when I came across the following while changing some
code to send parameters out of line (to avoid interpolation).

postgres=# prepare test1 as select timestamp '2009-01-01';
PREPARE
postgres=# prepare test2 as select timestamp $1;
ERROR: syntax error at or near "$1"

The workaround is simple, use a cast instead, but is there a particular
reason why you can't use a parameter there?

This does work, oddly enough.

postgres=# prepare test2 as select timestamp '2009-01-01' at time zone $1;
PREPARE

Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Please line up in a tree and maintain the heap invariant while
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