hashtable issue - HASH_FIND??

Hi there,

I'm looking to use the PostgreSQL Hash Table for some custom functions.
However, the example, as per http://wiki.postgresql.org/wiki/HashTable crashes
postmaster (or segfaults from the cmd line) when trying to retrieve an element
from the hash.


Specifically this line fails: elem = hash_search(hashtable, (void *)key,
HASH_FIND, &found);

I can't see anything obviously wrong, is this a bug? Either in the example's
code or in the server code itself?
Any help much appreciated!