set-car! called by value instead of by reference

[GoogleCodeExporter]

What steps will reproduce the problem?
Evaluating the following lines:
(define a '(0))
(define (set-car-wrapper! list x)
    (set-car! list x))
(set-car-wrapper! a 3)

What is the expected output? What do you see instead?
a should be (3) yet evaluating the above results in an error.

What version of the product are you using? On what operating system?
Ypsilon 0.9.6-update3 running under Ubuntu 9.04.

Please provide any additional information below.

Original issue reported on code.google.com by Daniel.L...@gmail.com on 25 Apr 2010 at 11:22