diff --git a/prelude.alc b/prelude.alc
index 0d40395..dc9d911 100644
--- a/prelude.alc
+++ b/prelude.alc
@@ -11,13 +11,6 @@ let universe = type_(9, 1)
 	lambda (x : T)
 		wrap T x
 
-let foo = debug-track
-	lambda_implicit (a : type)
-		lambda_implicit (b : type)
-			lambda (c : a, d : b)
-				c
-let test = foo(1, 2)
-
 let implicit-wrap = lambda_curry ((T : type_(10, 0)))
 	lambda (x : T)
 		wrap T x
@@ -153,29 +146,28 @@ let _&_ =
 				wrapped (forall (a : U, b : U) -> (res : U))
 
 let covariant = 
-	debug-track
-		lambda_curry (U : type_(9, 1), a : U)
-			unwrap
-				intrinsic
-					""""
-						local string_array = terms_gen.declare_array(terms_gen.builtin_string)
-						return terms.value.closure(
-							"#covariant-args",
-							terms.typed_term.tuple_elim(
-								string_array("base"),
-								terms.typed_term.bound_variable(1),
-								1,
-								terms.typed_term.variance_cons(
-									terms.typed_term.literal(
-										terms.value.host_value(true)
-									),
-									terms.typed_term.bound_variable(2)
-								)
-							),
-							terms.runtime_context()
-						)
-					:
-					wrapped (forall ((rel : srel(a))) -> (res : variance(a)))
+	lambda_curry (U : type_(9, 1), a : U)
+		unwrap
+			intrinsic
+				""""
+					local string_array = terms_gen.declare_array(terms_gen.builtin_string)
+					return terms.value.closure(
+						"#covariant-args",
+						terms.typed_term.tuple_elim(
+							string_array("base"),
+							terms.typed_term.bound_variable(1),
+							1,
+							terms.typed_term.variance_cons(
+								terms.typed_term.literal(
+									terms.value.host_value(true)
+								),
+								terms.typed_term.bound_variable(2)
+							)
+						),
+						terms.runtime_context()
+					)
+				:
+				wrapped (forall ((rel : srel(a))) -> (res : variance(a)))
 
 let contravariant = 
 	lambda_curry (U : type_(9, 1), a : U)
@@ -327,7 +319,7 @@ let new-host-type-family = lambda (unique-id : host-unique-id, signature : type_
 				signature_ : wrapped(type_(1, 0)),
 				variance_  : wrapped(host-family-sig-variances(unwrap(signature_))))
 			->
-			((family : wrapped(signature)))
+			(family : wrapped(unwrap(signature_)))
 	let (family) = inner(unique-id, wrap(signature), wrap(variance))
 	unwrap(family)
 let new-host-type = lambda (unique-id : host-unique-id)
@@ -338,7 +330,7 @@ let new-host-type = lambda (unique-id : host-unique-id)
 
 let host-array-type = new-host-type-family new-host-unique-id("array")
 	forall ((T : host-type)) -> (T : host-type)
-	tuple-of-implicit debug-track(covariant(subtyping))
+	tuple-of-implicit covariant(subtyping)
 
 let host-array-new = lambda (T : host-type)
 	let inner = intrinsic
diff --git a/tests/implicit.alc b/tests/implicit.alc
index 170ab93..0f6ff1d 100644
--- a/tests/implicit.alc
+++ b/tests/implicit.alc
@@ -2,6 +2,13 @@ let id = lambda_implicit (T : type_(10, 0))
 	lambda (x : T)
 		x
 
+let foo =
+	lambda_implicit (a : type)
+		lambda_implicit (b : type)
+			lambda (c : a, d : b)
+				c
+let test = foo(1, 2)
+
 # TODO: test this when tuple-desc can do more than just star-0
 #let point = lambda_implicit (U : type_(10))
 #	lambda (T : U)