🚀 go-pugleaf

I am pretty new to explorer, but find it quite easy to work with.
After connecting some modules, I tried Data Scribe to construct
a module that read in my own image file format (actually just
raw images, so there is a slider to set the size).
Now I set for an experiment with LatFunction before trying to write
my own module(s). However, I got the impression that LatFunction,
resp. the Shape Language it interprets, is somewhat buggy.
In fact, I boiled my program down to the very simplest Shape program,
which just reads:

First_Out := First_In;

I then get the error message

LatFunction: [undound symbol: First_In]

If I turn on the debuger, I see LatFunction read in my code, then the prelude
and the postlude. It then starts working on the prelude, but quickly
gets some errors saying

LatFunction: [unbound symbol: lat_data]
and
LatFunction: [unbound symbol: lat_ccord]

The Explorer Module Writer's Guide says on page 4-33 that these things
are defined on startup of the LatFunction Module, but obviously they
are not.

Am I missing something, or is this a known bug? How can I fix things?

Many thanks in advance for useful answers.

Yours sincerely,	Martin J. Du"rst.