Re: unhandled constant?

[Ricardo Wurmus]

Han-Wen Nienhuys <address@hidden> writes:

> Some of the lilypond Scheme files do the following:
>
>
> (define decl '())
> (define (make-var n v) (list "var" n v))
> (defmacro define-session (name value)
>   (define (inner n v)
>     (set! decl
>         (cons
>          (make-var n v)
>          decl))
>     )
>   `(,inner ',name ,value))
> (define-session foo 1)
> (display decl)
> (newline)
>
> In GUILE 2.2, this yields
>
> ;;; WARNING: compilation of /home/hanwen/vc/lilypond/q.scm failed:
> ;;; unhandled constant #<procedure inner (a b)>
>
> What does this error message mean, and what should I do to address the 
> problem?

Would it be feasible to use define-syntax-rule here?

--8<---------------cut here---------------start------------->8---
(define decl '())
(define (make-var n v) (list "var" n v))
(define-syntax-rule (define-session name value)
  (let ((inner (lambda (n v)
                 (set! decl
                       (cons
                        (make-var n v)
                        decl)))))
    (inner 'name value)))
(define-session foo 1)
(display decl)
(newline)
--8<---------------cut here---------------end--------------->8---


-- 
Ricardo