diff options
| -rw-r--r-- | vikalpa.scm | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/vikalpa.scm b/vikalpa.scm index 0264ba9..27d09c8 100644 --- a/vikalpa.scm +++ b/vikalpa.scm @@ -168,8 +168,15 @@ (define (expression-vars expr) (cond - ((pair? expr) - (apply lset-union eq? + ((expr-quoted? expr) '()) + ((if-form? expr) + (lset-union eq? + (expression-vars (if-form-test expr)) + (expression-vars (if-form-then expr)) + (expression-vars (if-form-else expr)))) + ((app-form? expr) + (apply lset-union + eq? (map expression-vars (app-form-args expr)))) ((variable? expr) (list expr)) (else '()))) |