Trouble creating SRFI-9 Record in C

[paul <paul@inktvis.org>]

Good day guile-users,

I am having a struggle with SRFI-9 records.  They look very 
convenient, so i'd like to use them in my Guile scripts.  However, 
i'm not sure how to correctly construct them from C-land.  I have 
something like the following:

```
(define-record-type <foo>
  (make-foo a b)
  foo?
  (a foo-a)
  (b foo-b))
```

In Guile land, that works great.  Now, i want to create a foo in C 
and pass it to a function in the Guile script.  I do something 
like the following:

```
scm_c_primitive_load("foo.scm");
scm_call_5(scm_variable_ref(scm_c_lookup("make-foo")),
           scm_from_utf8_string("blah"),
           scm_from_int32(Int32(42)))
```

However, this results in an error:

guile: uncaught exception:
Wrong type to apply: #<syntax-transformer make-foo>

I've tried with and without (define-module foo) at the top of the 
file, that doesn't seem to make a difference.  I've been able to 
work around the issue by defining a wrapper (define (foo-prime a 
b) (make-foo a b)) and using that in C as shown above, but that 
feels ugly.  I'm probably missing something obvious, but trawling 
the mailing list didn't turn up anything i could understand.

Does anyone see what i'm doing wrong, or can i simply not use 
SRFI-9 records in this way?

Thanks, 🙌
p.