writing custom data type

Hey Guys,

I've been having trouble writing my own custom datatype for PG. when I do
my `CREATE FUNCTION` call, it fails with:

resultsets=# CREATE FUNCTION fuzzytime_in(cstring)
RETURNS fuzzytime
AS 'fuzzytimetype'
LANGUAGE C IMMUTABLE STRICT;
NOTICE: return type fuzzytime is only a shell
ERROR: could not find function "fuzzytime_in" in file
"/usr/lib/postgresql/9.1/lib/fuzzytimetype.so"

--

now I checked my shared lib, and surely enough, it's there

$ objdump -t /usr/lib/postgresql/9.1/lib/fuzzytimetype.so
...
00000000000018b0 g F .text 0000000000000070 fuzzytime_in
...

--

So what gives? The code has PG_MODULE_MAGIC, and I'm
calling PG_FUNCTION_INFO_V1(fuzzytime_in);

I'd really appreciate any help with this.

Cheers,
Arthur Chan