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-rw-r--r--contrib/extraction/mlutil.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/contrib/extraction/mlutil.ml b/contrib/extraction/mlutil.ml
index c55d3746f7..5c842f159c 100644
--- a/contrib/extraction/mlutil.ml
+++ b/contrib/extraction/mlutil.ml
@@ -655,7 +655,7 @@ let check_generalizable_case unsafe br =
(*s Do all branches correspond to the same thing? *)
let check_constant_case br =
- if br = [||] then raise Impossible;
+ if Array.length br = 0 then raise Impossible;
let (r,l,t) = br.(0) in
let n = List.length l in
if ast_occurs_itvl 1 n t then raise Impossible;