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-rw-r--r--pretyping/detyping.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/pretyping/detyping.ml b/pretyping/detyping.ml
index ba2d2fdf39..8d8a9950e3 100644
--- a/pretyping/detyping.ml
+++ b/pretyping/detyping.ml
@@ -211,7 +211,7 @@ let lookup_index_as_renamed env t n =
lookup (n-1) (d+1) c'
)
| Cast (c,_,_) -> lookup n d c
- | _ -> None
+ | _ -> if n=0 then Some (d-1) else None
in lookup n 1 t
(**********************************************************************)