Formulate destructors properly

[scheme.git] / typecheck.scm

diff --git a/typecheck.scm b/typecheck.scm
index 4cc93495fb9dd6bc90b03b9b06271e316c65a8bb..821035230affddf4d813074316f5aecaeaa2efc5 100644 (file)
--- a/typecheck.scm
+++ b/typecheck.scm
@@ -37,7 +37,7 @@
 
                                        ; ('a, ('b, 'a))
 (define (env-lookup env n)
-  (if (null? env) (error #f "empty env")                       ; it's a type equality
+  (if (null? env) (error #f "empty env" env n)                 ; it's a type equality
       (if (eq? (caar env) n)
          (cdar env)
          (env-lookup (cdr env) n))))
@@ -136,11 +136,11 @@
     (check new-env (last (let-body x)))))
 
 (define (check env x)
-  (display "check: ")
-  (display x)
-  (display "\n\t")
-  (display env)
-  (newline)
+  ;; (display "check: ")
+  ;; (display x)
+  ;; (display "\n\t")
+  ;; (display env)
+  ;; (newline)
   (let
       ((res
        (case (ast-type x)
@@ -227,31 +227,24 @@
                     (let ((return-type (substitute cs (caddr resolved-func-type))))
                       (list cs return-type))
                     (error #f "not a function")))))))
-    (display "result of ")
-    (display x)
-    (display ":\n\t")
-    (display (pretty-type (cadr res)))
-    (display "\n\t[")
-    (display (pretty-constraints (car res)))
-    (display "]\n")
+    ;; (display "result of ")
+    ;; (display x)
+    ;; (display ":\n\t")
+    ;; (display (pretty-type (cadr res)))
+    ;; (display "\n\t[")
+    ;; (display (pretty-constraints (car res)))
+    ;; (display "]\n")
     res))
 
                                        ; we typecheck the lambda calculus only (only single arg lambdas)
 (define (typecheck prog)
-  (define (constructor-type t ctr)
-    (fold-left (lambda (acc x) `(abs ,x ,acc)) t (cdr ctr)))
-  (define (constructors data-def)
-    (let ([type-name (cadr data-def)]
-         [ctrs (cddr data-def)])
-    (fold-left (lambda (acc ctr)
-                (cons (cons (car ctr) (constructor-type type-name ctr))
-                      acc))
-              '()
-              ctrs)))
-  (let ([init-env (flat-map constructors (program-datas prog))])
+
+  (let ([init-env (flat-map data-tors (program-datas prog))])
     (display init-env)
+    (newline)
     (cadr (check init-env (normalize (program-body prog))))))
 
+  
                                        ; returns a list of constraints
 (define (~ a b)
   (let ([res (unify? a b)])