X-Git-Url: https://git.lukelau.me/?p=scheme.git;a=blobdiff_plain;f=typecheck.scm;fp=typecheck.scm;h=e96f6943767e1c5ab463398d11146d8f8ae450ce;hp=219b010202a7f7a0127847e8372ea7e064a05efb;hb=4a6161c0db78e4739433377861c0fa89b92619be;hpb=2fb532c612fb077a99938b54d59a9520b71772b0

diff --git a/typecheck.scm b/typecheck.scm
index 219b010..e96f694 100644
--- a/typecheck.scm
+++ b/typecheck.scm
@@ -339,12 +339,13 @@
 					; input: a list of binds ((x . y) (y . 3))
 					; returns: pair of verts, edges ((x y) . (x . y))
 (define (graph bs)
+  (define (go bs orig-bs)
     (define (find-refs prog)
       (ast-collect
        (lambda (x)
 	 (case (ast-type x)
 					; only count a reference if its a binding
-	 ['var (if (assoc x bs) (list x) '())]
+	   ['var (if (assoc x orig-bs) (list x) '())]
 	   [else '()]))
        prog))
     (if (null? bs)
@@ -358,10 +359,11 @@
 
 	       (rest (if (null? (cdr bs))
 			 (cons '() '())
-		       (graph (cdr bs))))
+			 (go (cdr bs) orig-bs)))
 	       (total-verts (cons vert (car rest)))
 	       (total-edges (append edges (cdr rest)))]
 	  (cons total-verts total-edges))))
+  (go bs bs))
 
 (define (successors graph v)
   (define (go v E)