thunk libraries

I have added support for thunk libaries, as discussed a few weeks ago.

Here's an example:

(define-library (foobar)
   (module foo
       (foo-f)
     (define (foo-f) '(foo)))
   (module bar
       (bar-f)
     (import foo)
     (define (bar-f) (cons 'bar (foo-f)))))
(define-library (bazboo foobar)
   (module baz
       (baz-f)
     (import bar)
     (define (baz-f) (cons 'baz (bar-f))))
   (module boo
       (boo-f)
     (import baz)
     (define (boo-f) (cons 'boo (baz-f)))))

(import boo)
(boo-f) ;=> '(boo baz bar foo)

(save-thunk-library 'foobar "/tmp/foobar.slt")
(save-thunk-library 'bazboo "/tmp/bazboo.slt")

;;then after a restart
(with-class-path (list "/tmp/")
   (lambda () (require-library 'bazboo)))
(import boo)
(boo-f) ;=> '(boo baz bar foo)


Things left to do:

* document this new feature

* convert srfi lib from compiled lib to thunk libs 
sisc/libs/srfi/srfi-{n}.slt

* testing

Help appreciated.


Matthias.



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