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-rw-r--r--lib/util.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/util.ml b/lib/util.ml
index a20dba0fc4..b67539918d 100644
--- a/lib/util.ml
+++ b/lib/util.ml
@@ -124,6 +124,7 @@ let delayed_force f = f ()
type ('a, 'b) union = ('a, 'b) CSig.union = Inl of 'a | Inr of 'b
type 'a until = 'a CSig.until = Stop of 'a | Cont of 'a
+type ('a, 'b) eq = ('a, 'b) CSig.eq = Refl : ('a, 'a) eq
let map_union f g = function
| Inl a -> Inl (f a)