Hi, I use slime 1.0 with emacs 21.3.1 and sbcl 0.8.19.29. If I run the command slime-compile-file with the following code everything is OK: (defpackage :test-c-call (:use :cl :sb-alien :sb-c-call)) (in-package :test-c-call) (define-alien-routine my-func void) However, if I change the above my-func-definition to return a pointer for example: (define-alien-routine my-func (* t)) Then I get the this error: error while parsing arguments to DESTRUCTURING-BIND: invalid number of elements in () to satisfy lambda list ((SWANK-BACKEND::START . SWANK-BACKEND::END)): exactly 1 expected, but 0 found [Condition of type SB-KERNEL::ARG-COUNT-ERROR] This happens only when using the slime-compile-* functions. If I enter the alien-definition directly on the repl-prompt it gives me no error. Maybe you know how to fix that. Thank you.