diff --git a/pkgs/redex-pkgs/redex-test/redex/tests/dq-test.rkt b/pkgs/redex-pkgs/redex-test/redex/tests/dq-test.rkt
new file mode 100644
index 0000000000..1cd759d76d
--- /dev/null
+++ b/pkgs/redex-pkgs/redex-test/redex/tests/dq-test.rkt
@@ -0,0 +1,599 @@
+#lang racket
+
+(require redex/private/pat-unify
+         rackunit
+         (for-syntax redex/private/rewrite-side-conditions 
+                     racket/list))
+
+
+(define-syntax check-dq
+  (syntax-rules ()
+    [(check-dq args ... #f)
+     (let/ec fail
+       (let ([check/fail (λ (c) (if (or (not c)
+                                        (unif-fail? c))
+                                    (fail (void))
+                                    c))])
+         (check-dq-hlp check/fail args ... #f)))]
+    [(check-dq args ...)
+     (let/ec fail
+       (let ([check/fail (λ (c) (if (or (not c)
+                                        (unif-fail? c))
+                                    (fail (error 'check-dq "unexpected failure: ~s" '(args ...)))
+                                    c))])
+         (check-dq-hlp check/fail args ...)))]))
+
+(define-syntax (check-dq-hlp stx)
+  (syntax-case stx (=== =/= --> return env:)
+    [(_ check/fail eigens --> return env: e)
+       #'e]
+    [(_ check/fail eigens --> #f env: e)
+       #'(check-false e)]
+    [(_ check/fail eigens --> #t env: e)
+     #'(check-not-false e)]
+    [(_ check/fail eigens --> l2 =/= r2 || l3 =/= r3 env: e)
+     (with-syntax ([(l2-p r2-p l3-p r3-p) (to-pats (list #'l2 #'r2 #'l3 #'r3))])
+       #'(let ([res-dq (dq-dq (first (env-dqs (check/fail e))))])
+           (check-not-false
+            (or (equal? (nts->any res-dq)
+                       (list l2-p r2-p))
+                (equal? (nts->any res-dq)
+                       (list l3-p r3-p))))))]
+    [(_ check/fail eigens --> l2 =/= r2 env: e)
+     (with-syntax ([(l2-p r2-p) (to-pats (list #'l2 #'r2))])
+       #'(let ([res-dq (dq-dq (first (env-dqs (check/fail e))))])
+           (check-equal? (nts->any res-dq)
+                         (list l2-p r2-p))))]
+    [(_ check/fail eigens l === r rest ... env: e)
+     (with-syntax ([(l-p r-p) (to-pats (list #'l #'r))])
+       #'(check-dq-hlp check/fail eigens rest ... env: (p*e-e (check/fail (unify l-p r-p (check/fail e) #f)))))]
+    [(_ check/fail eigens l =/= r rest ... env: e)
+     (with-syntax ([(l-p r-p) (to-pats (list #'l #'r))])
+       #'(check-dq-hlp check/fail eigens rest ... env: (disunify 'eigens l-p r-p (check/fail e) #f)))]
+    [(_ no-env ...)
+     (not (memq 'env: (flatten (syntax->datum #'(no-env ...)))))
+     #'(check-dq-hlp no-env ... env: empty-env)]))
+
+(define (nts->any s-exp)
+  (match s-exp
+    [`(nt ,_) 'any]
+    [(bound) 'any]
+    [(list es ...)
+     (map nts->any es)]
+    [_ s-exp]))
+
+(define-for-syntax (to-pats ps-in)
+  (define syms (filter symbol? (flatten (map syntax->datum ps-in))))
+  (define (make-pat s) 
+    (with-syntax ([(_ p _ _) 
+                   (rewrite-side-conditions/check-errs syms 'check-dq #t s)])
+      #'(nts->any 'p)))
+  (map make-pat ps-in))
+
+
+(check-dq
+   (a b)
+   (a b) =/= x
+   x === (1 2)
+   -->
+   #f)
+
+(check-dq
+   (a b)
+   x === (1 2)
+   (a b) =/= x
+   -->
+   #f)
+
+(check-dq
+   (a b)
+   (a a) =/= x
+   x === (1 2)
+   -->
+   #t)
+
+(check-dq
+   (a b)
+   x === (1 2)
+   (a a) =/= x
+   -->
+   #t)
+
+(check-dq
+   (c d)
+   x === (1 2)
+   x === (a b)
+   x =/= (c d)
+   -->
+   #f)
+
+(check-dq
+   (c d)
+   x === (1 2)
+   x =/= (c d)
+   x === (a b)
+   -->
+   #f)
+(check-dq
+   (c d)
+   x =/= (c d)
+   x === (1 2)
+   x === (a b)
+   -->
+   #f)
+
+(check-dq
+   (c d)
+   x === (1 2)
+   x === (a b)
+   x =/= (c c)
+   -->
+   #t)
+
+(check-dq
+   (c d)
+   x === (1 2)
+   x =/= (c c)
+   x === (a b)
+   -->
+   #t)
+(check-dq
+   (c d)
+   x =/= (c c)
+   x === (1 2)
+   x === (a b)
+   -->
+   #t)
+
+;; The following is translated from the kanren
+;; test suite. Only those tests that actually
+;; apply in this context were transcribed.
+;; Essentially, those of the form:
+;; exists x ... eqs ... forall y ... single-dq
+;; i.e. some conjuction of equations under 
+;; existential quantifiers and a single dq 
+;; under an additional universal quantifier.
+
+;; Eigen test suite
+;; Jason Hemann, Will Byrd, Dan Friedman
+;; Pre-alpha
+
+
+#|
+(test-check "eigen test 10"
+  (run 1 (q) (eigen (x) (=/= x q)))
+  '())
+|#
+
+(check-false
+ (disunify '(x) '(name x any) '(name q any) empty-env #f))
+
+#|
+(test-check "eigen test 12"
+  (run 1 (q) (eigen (e1 e2) (=/= 5 e2)))
+  '())
+|#
+
+(check-false
+ (disunify '(e1 e2) 5 '(name e2 any) empty-env #f))
+
+#|
+(test-check "eigen test 13"
+  (run 1 (q) (eigen (e1 e2) (=/= e1 e2)))
+  '())
+|#
+
+(check-false
+ (disunify '(e1 e2) '(name e1 any) '(name e2 any) empty-env #f))
+
+#|
+(test-check "eigen test 14.5"
+  (run 1 (q)
+    (eigen (a b)
+      (=/= `(,a . ,b) q)))
+  '((_.0 (=/= ((_.0 (e.0 . e.1)))))))
+|#
+
+(check-dq
+   (a b)
+   (a b) =/= q 
+   -->
+   (q) =/= ((a b)))
+
+
+#|
+(test-check "pair w/eigen younger than var"
+  (run 1 (q) (eigen (a) (=/= `(1 . ,q) a)))
+  '())
+|#
+
+(check-dq
+ (a)
+ (1 q) =/= a
+ -->
+ #f)
+
+#|
+
+
+(test-check "eigen test 16"
+  (run 1 (q) 
+    (fresh (x) 
+      (eigen (a)
+        (=/= `(6 ,x) `(5 ,a)))))
+  '(_.0))
+|#
+
+(check-dq
+ (a)
+ (6 x) =/= (5 a)
+ -->
+ #t)
+
+#|
+
+(test-check "D & J 1"
+  (run 1 (q) (eigen (a) (=/= `(1 2 3 ,q 4) a)))
+  '())
+|#
+
+(check-dq
+ (a)
+ (1 2 3 q 4) =/= a
+ -->
+ #f)
+
+
+#|
+
+(test-check "Will's 4"
+  (run 1 (q) (fresh (x) (eigen (a) (=/= `(1 2 3 ,a 4) x))))
+  '(_.0))
+|#
+
+(check-dq
+ (a)
+ (1 2 3 a 4) =/= x
+ -->
+ #t)
+
+#|
+
+(test-check "Will's 5"
+  (run 1 (q) (fresh (x) (eigen (a) (=/= `(1 2 3 ,x 4) a))))
+  '())
+|#
+
+(check-dq
+ (a)
+ (1 2 3 x 4) =/= a
+ -->
+ #f)
+
+#|
+
+(test-check "eigen test"
+  ;; Exists X, Forall A . A =/= `(,X)
+  ;; Fails. Let A be `(,X)
+  (run 1 (x) (eigen (a) (=/= a `(,x))))
+  '())
+|#
+
+(check-dq
+ (a)
+ a =/= (x)
+ -->
+ #f)
+
+#|
+
+(test-check "eigen disequalities, working"
+  ;; Exists X, Forall A. `(1 2 3 ,a 4) =/= X
+  ;; Let X be any symbol
+  (run 1 (q) (fresh (x) (eigen (a) (=/= `(1 2 3 ,a 4) x))))
+  '(_.0))
+|#
+
+(check-dq
+ (a)
+ (1 2 3 a 4) =/= x
+ --> 
+ #t)
+
+#|
+
+(test-check "Eigen on pair"
+  (run 1 (q) (eigen (e) (=/= e `(,e))))
+  '(_.0))
+|#
+
+(check-dq
+ (e)
+ e =/= (e)
+ -->
+ #t)
+
+#|
+
+(test-check "eigen-pairs 12"
+  (run 1 (q)
+    (fresh (y) 
+      (eigen (e1 e2)
+        (=/= `(,e1 . ,e2) y))))
+  '(_.0))
+|#
+
+(check-dq
+ (e1 e2)
+ (e1 e2) =/= y
+ -->
+ #t)
+
+#|
+(test-check "eigen-pairs 13"
+  (run 1 (q)
+    (fresh (y)
+      (== y 7)
+      (eigen (e1 e2)
+        (=/= `(,e1 . ,e2) y))))
+  '(_.0))
+|#
+
+(check-dq
+ (e1 e2)
+ y === 7
+ (e1 e2) =/= y
+ -->
+ #t)
+
+#|
+
+(test-check "eigen-pairs 14"
+  (run 1 (q)
+    (fresh (y)
+      (eigen (e1 e2)
+        (=/= `(,e1 . ,e2) y)
+        (== y 7))))
+  '(_.0))
+|#
+
+(check-dq
+ (e1 e2)
+ y === 7
+ (e1 e2) =/= y
+ -->
+ #t)
+
+#|
+
+(test-check "Eigen violation, again"
+  (run 1 (q) (eigen (x) (=/= x q)))
+  '())
+|#
+
+(check-dq
+ (q)
+ x =/= q
+ --> 
+ #f)
+
+#|
+
+(test-check "Eigen violation, again 2"
+  (run 1 (q) (eigen (x) (=/= q x)))
+  '())
+|#
+
+(check-dq
+ (x)
+ q =/= x
+ --> 
+ #f)
+
+
+#|
+
+(test-check "same eigen issues, small"
+  (run 1 (q) 
+    (eigen (e1)
+      (=/= `(1 . 0) `(,e1 . ,e1))))
+  '(_.0))
+|#
+
+(check-dq
+ (e1)
+ (1 0) =/= (e1 e1)
+ -->
+ #t)
+
+#|
+(test-check "inviolable contraint should be tossed"
+  (run 1 (q) 
+    (eigen (e e2) 
+      (=/= `(1 1 . ()) `(,e ,e2 . ,e))))
+  '(_.0))
+|#
+
+(check-dq
+ (e e2)
+ (1 1 0) =/= (e e2 e)
+ --> 
+ #t)
+
+#|
+
+(test-check "same eigens can't unify to distinct values"
+  (run 1 (q) 
+    (== q 1)
+    (eigen (e e2) 
+      (=/= `(,q ,q . ()) `(,e ,e2 . ,e)) (prt)))
+  '(1))
+|#
+
+(check-dq
+ (e e2)
+ q === 1
+ (q q 0) =/= (e e2 2)
+ -->
+ #t)
+
+#|
+
+(test-check "shapes are issues, should fail"
+  (run 1 (q) 
+    (eigen (e e2) 
+      (=/= `(,q ,q . ()) `(,e ,e2 . ,e)) (prt))
+    (== q '()))
+  '())
+|#
+
+(check-dq
+ (e e2)
+ q === 0
+ (q q 0) =/= (e e2 e)
+ --> 
+ #f)
+
+#|
+
+
+(printf "These are off for the moment~n")
+
+#!eof
+|#
+#|
+(test-check "eigens need to create disequality constraints; we smuggle'em in"
+  (run 1 (q)
+    (eigen (e)
+      (=/= `(,q . ()) `(,e . ,e))))
+  '((_.0) (=/= ((_.0 ())))))
+|#
+
+(check-dq
+ (e)
+ (q 0) =/= (e e)
+ -->
+ (q) =/= (0))
+
+#|
+
+(test-check "eigens need to create disequality constraints; we smuggle'em in b"
+  (run 1 (q)
+    (eigen (e)
+      (=/= `(() . ,q) `(,e . ,e))))
+  '((_.0 (=/= ((_.0 ()))))))
+|#
+
+(check-dq
+ (e)
+ (0 q) =/= (e e)
+ -->
+ (q) =/= (0))
+
+#|
+
+(test-check "eigens need to find their way to causing disequalities, through subst"
+  (run 1 (q)
+    (fresh (a b c)
+      (== `(,a ,b ,c) q)
+      (eigen (e)
+        (=/= `(,e ,b ,e) `(,a ,c ,c))
+        (== b c))))
+  '((_.0 _.1 _.2) (=/= ((_.0 _.2)))))
+|#
+
+;; equivalent, since b = c?
+;!!!
+(check-dq
+ (e)
+ b === c
+ (e b e) =/= (a c c)
+ -->
+ (b a) =/= (e e)
+ ||
+ (a b) =/= (e e))
+
+#|
+
+(test-check "shapes are issues"
+  (run 1 (q) 
+    (eigen (e e2) 
+      (=/= `(,q ,q . ()) `(,e ,e2 . ,e)) (prt)))
+  '(_.0))
+|#
+
+(check-dq
+ (e1 e2)
+ (q q 0) =/= (e e2 e)
+ -->
+ #t)
+
+#|
+
+(test-check "one of these things is not like the other"
+  (run 1 (q) 
+    (fresh (a b c)
+      (== `(,a ,b ,c) q)
+      (eigen (e)
+        (=/= `(,a ,b ,c) `(,e ,e ,e)))))
+  '((_.0 _.1 _.2) (=/= ((_.0 _.1) (_.0 _.2) (_.1 _.2)))))
+|#
+
+;; a =/= b \/ a =/= c \/ b =/= c <-> a =/= c \/ b =/= c <-> (b a) =/= (c c)
+(check-dq
+ (e)
+ (a b c) =/= (e e e)
+ -->
+ (b a) =/= (c c)
+ ||
+ (a b) =/= (c c))
+
+#|
+
+(test-check "should succeed b/c same eigen, diff vars"
+  (run 1 (q) 
+    (fresh (a b) 
+      (== `(,a . ,b) q)
+      (eigen (e1)
+        (=/= `(,a . ,b) `(,e1 . ,e1)))))
+  '((_.0 _.1) (=/= ((_.0 _.1)))))
+|#
+
+(check-dq
+ (e1)
+ (a b) =/= (e1 e1)
+ -->
+ (a) =/= (b))
+
+
+#|
+
+(test-check "occurs-checky-thing-w-same-var"
+  (run 1 (q)
+    (fresh (a)
+      (eigen (e)
+        (=/= `(,a . (,a)) `(,e . ,e)))))
+  '(_.0))
+|#
+
+(check-dq
+ (e)
+ (a (a)) =/= (e e)
+ -->
+ #t)
+
+#|
+
+(test-check "occurs-checky-thing-w-same-var b"
+  (run 1 (q)
+    (fresh (a)
+      (eigen (e)
+        (=/= `((,a) . ,a) `(,e . ,e)))))
+  '(_.0))
+|#
+
+(check-dq
+ (e)
+ ((a) a) =/= (e e)
+ --> 
+ #t)
\ No newline at end of file
diff --git a/pkgs/redex-pkgs/redex-test/redex/tests/run-tests.rkt b/pkgs/redex-pkgs/redex-test/redex/tests/run-tests.rkt
index cc783bd53e..59d1fe6eeb 100644
--- a/pkgs/redex-pkgs/redex-test/redex/tests/run-tests.rkt
+++ b/pkgs/redex-pkgs/redex-test/redex/tests/run-tests.rkt
@@ -22,6 +22,7 @@
      "matcher-test.rkt"
      "rewrite-side-condition-test.rkt"
      "unify-tests.rkt"
+     "dq-test.rkt"
      "tl-test.rkt"
      "term-test.rkt"
      "rg-test.rkt"