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-rw-r--r--lib/ur/top.ur10
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/ur/top.ur b/lib/ur/top.ur
index 21522310..01dd4479 100644
--- a/lib/ur/top.ur
+++ b/lib/ur/top.ur
@@ -61,13 +61,15 @@ con thd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.3
con mapU = K ==> fn f :: K => map (fn _ :: Unit => f)
-con ex = fn tf :: (Type -> Type) =>
- res ::: Type -> (choice :: Type -> tf choice -> res) -> res
+con ex = K ==> fn tf :: (K -> Type) =>
+ res ::: Type -> (choice :: K -> tf choice -> res) -> res
-fun ex [tf :: (Type -> Type)] [choice :: Type] (body : tf choice) : ex tf =
- fn [res] (f : choice :: Type -> tf choice -> res) =>
+fun ex_intro [K] [tf :: K -> Type] [choice :: K] (body : tf choice) : ex tf =
+ fn [res] (f : choice :: K -> tf choice -> res) =>
f [choice] body
+fun ex_elim [K] [tf ::: K -> Type] (v : ex tf) [res ::: Type] = @@v [res]
+
fun compose [t1 ::: Type] [t2 ::: Type] [t3 ::: Type]
(f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x)