X-Git-Url: http://git.lukelau.me/?p=scheme.git;a=blobdiff_plain;f=typecheck.scm;h=f6d7c86465f4869043b3d2fcb9560e42603258d7;hp=b3466751fdf7f4161963d3904c13f970b8798a76;hb=3d94d4500167a8327473e15cf477727968ee36a2;hpb=0db4aa6c791e5ed27bfd9c4461e7a5337ee699e1

diff --git a/typecheck.scm b/typecheck.scm
index b346675..f6d7c86 100644
--- a/typecheck.scm
+++ b/typecheck.scm
@@ -194,10 +194,14 @@
     
     (define (get-bindings product-types pattern)
       (define (go product-type product)
-	     (case (ast-type x)
+	(case (ast-type product)
 	  ['var (list (cons product product-type))]
 					; an inner pattern match
-	       ['app (get-bindings product-type product)]))
+	  ['app (let* ([inner-sum (car product)]
+		       [inner-sums (cdr (assoc product-type dls))]
+		       [inner-product-types (cdr (assoc inner-sum inner-sums))])
+		  (get-bindings inner-product-types product))]
+	  [else '()]))
       (flat-map go product-types (cdr pattern)))
 
     
@@ -211,6 +215,7 @@
 	    (let* ([names (cdr pattern)]
 		   [product-types (cdr sum)]
 		   [new-env (append (get-bindings product-types pattern) env)])
+
 	      (check dls new-env expr)))]
 					; pattern match with binding and no constructor
 	['var (check dls (env-insert env pattern switch-type) expr)]