diff --git a/collects/typed-scheme/private/prims.ss b/collects/typed-scheme/private/prims.ss
index b9fdfe2e..2414b552 100644
--- a/collects/typed-scheme/private/prims.ss
+++ b/collects/typed-scheme/private/prims.ss
@@ -124,16 +124,20 @@ This file defines two sorts of primitives. All of them are provided into any mod
 (define-syntax (plambda: stx)
   (syntax-case stx ()
     [(plambda: (tvars ...) formals . body)
-     (syntax-property #'(lambda: formals . body)
-                      'typechecker:plambda
-                      #'(tvars ...))]))
+     (quasisyntax/loc stx
+       (#%expression
+        #,(syntax-property (syntax/loc stx (lambda: formals . body))
+                           'typechecker:plambda
+                           #'(tvars ...))))]))
 
 (define-syntax (pcase-lambda: stx)
   (syntax-case stx ()
     [(pcase-lambda: (tvars ...) cl ...)
-     (syntax-property #'(case-lambda: cl ...)
-                      'typechecker:plambda
-                      #'(tvars ...))]))
+     (quasisyntax/loc stx
+       (#%expression
+        #,(syntax-property (syntax/loc stx (case-lambda: cl ...))
+                           'typechecker:plambda
+                           #'(tvars ...))))]))
 
 (define-syntax (pdefine: stx)
   (syntax-case stx (:)
@@ -173,8 +177,11 @@ This file defines two sorts of primitives. All of them are provided into any mod
 
 (define-syntax (inst stx)
   (syntax-case stx (:)
-    [(_ arg : tys ...)
-     (syntax-property #'arg 'type-inst #'(tys ...))]
+    [(_ arg : . tys)
+     (syntax/loc stx (inst arg . tys))]    
+    [(_ arg tys ... ty ddd b)
+     (eq? (syntax-e #'ddd) '...)
+     (syntax-property #'arg 'type-inst #'(tys ... (ty . b)))]
     [(_ arg tys ...)
      (syntax-property #'arg 'type-inst #'(tys ...))]))
 
diff --git a/collects/typed-scheme/private/type-effect-convenience.ss b/collects/typed-scheme/private/type-effect-convenience.ss
index a0c6c815..cf76cb55 100644
--- a/collects/typed-scheme/private/type-effect-convenience.ss
+++ b/collects/typed-scheme/private/type-effect-convenience.ss
@@ -35,12 +35,12 @@
     [(False-Effect:) eff]
     [_ (error 'internal-tc-error "can't add var to effect ~a" eff)]))
 
-(define-syntax ->
-  (syntax-rules (:)
+(define-syntax (-> stx)
+  (syntax-case* stx (:) (lambda (a b) (eq? (syntax-e a) (syntax-e b)))
     [(_ dom ... rng : eff1 eff2)
-     (->* (list dom ...) rng : eff1 eff2)]
+     #'(->* (list dom ...) rng : eff1 eff2)]
     [(_ dom ... rng)
-     (->* (list dom ...) rng)]))
+     #'(->* (list dom ...) rng)]))
 
 (define-syntax ->*
   (syntax-rules (:)
diff --git a/collects/typed-scheme/private/type-utils.ss b/collects/typed-scheme/private/type-utils.ss
index 9da1fe36..5987266e 100644
--- a/collects/typed-scheme/private/type-utils.ss
+++ b/collects/typed-scheme/private/type-utils.ss
@@ -16,6 +16,7 @@
          subst 
          ret
          instantiate-poly
+         instantiate-poly-dotted
          tc-result: 
          tc-result-equal? 
          effects-equal?
@@ -52,10 +53,6 @@
   (define (sb t) (substitute-dots images name t))
   (if (hash-ref (free-vars* target) name #f)
       (type-case sb target
-                 ;; The way I handled this in my type system is via type validity checking.  Hrmm.
-                 #;[#:F name* (if (eq? name* name)
-                                (int-err "substitute-dots: got single variable ~a" name*)
-                                target)]
                  [#:F name* target]
                  [#:arr dom rng rest drest thn-eff els-eff
                         (if (and (pair? drest)
@@ -78,6 +75,27 @@
                                       (map (lambda (e) (sub-eff sb e)) els-eff)))])
       target))
 
+;; implements sd from the formalism
+;; substitute-dotted : Type Name Type Name -> Type
+(define (substitute-dotted image image-bound name target)
+  (define (sb t) (substitute-dotted image image-bound name t))
+  (if (hash-ref (free-vars* target) name #f)
+      (type-case sb target
+                 [#:F name*
+                      (if (eq? name* name)
+                          image
+                          target)]
+                 [#:arr dom rng rest drest thn-eff els-eff
+                        (make-arr (map sb dom)
+                                  (sb rng)
+                                  (and rest (sb rest))
+                                  (and drest
+                                       (cons (sb (car drest))
+                                             (if (eq? name (cdr drest)) image-bound (cdr drest))))
+                                  (map (lambda (e) (sub-eff sb e)) thn-eff)
+                                  (map (lambda (e) (sub-eff sb e)) els-eff))])
+      target))
+
 ;; substitute many variables
 ;; substitution = Listof[List[Name,Type]]
 ;; subst-all : substition Type -> Type
@@ -105,7 +123,16 @@
             [rest-tys (drop types (length fixed))]
             [body* (subst-all (map list fixed fixed-tys) body)])
        (substitute-dots rest-tys dotted body*))]
-    [_ (int-err "instantiate-many: requires Poly type, got ~a" t)]))
+    [_ (int-err "instantiate-poly: requires Poly type, got ~a" t)]))
+
+(define (instantiate-poly-dotted t types image var)
+  (match t
+    [(PolyDots: (list fixed ... dotted) body)
+     (unless (= (length fixed) (length types))
+       (int-err "instantiate-poly-dotted: wrong number of types: expected ~a, got ~a" (length fixed) (length types)))
+     (let ([body* (subst-all (map list fixed types) body)])
+       (substitute-dotted image var dotted body*))]
+    [_ (int-err "instantiate-poly-dotted: requires PolyDots type, got ~a" t)]))
 
 
 ;; this structure represents the result of typechecking an expression