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-rw-r--r--pretyping/inductiveops.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/pretyping/inductiveops.ml b/pretyping/inductiveops.ml
index d161ce612b..8fe807f2ee 100644
--- a/pretyping/inductiveops.ml
+++ b/pretyping/inductiveops.ml
@@ -370,7 +370,7 @@ let set_pattern_names env ind brv =
let arities =
Array.map
(fun c ->
- rel_context_length (fst (decompose_prod_assum c)) -
+ rel_context_length ((prod_assum c)) -
mib.mind_nparams)
mip.mind_nf_lc in
array_map2 (set_names env) arities brv