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-rw-r--r--interp/constrextern.ml5
1 files changed, 4 insertions, 1 deletions
diff --git a/interp/constrextern.ml b/interp/constrextern.ml
index 70a35c6132..9cdcb9e38b 100644
--- a/interp/constrextern.ml
+++ b/interp/constrextern.ml
@@ -982,7 +982,10 @@ let rec glob_of_pat env sigma = function
| PEvar (evk,l) ->
let test (id,_,_) = function PVar id' -> Id.equal id id' | _ -> false in
let l = Evd.evar_instance_array test (Evd.find sigma evk) l in
- let id = Evd.evar_ident evk sigma in
+ let id = match Evd.evar_ident evk sigma with
+ | None -> Id.of_string "__"
+ | Some id -> id
+ in
GEvar (loc,id,List.map (on_snd (glob_of_pat env sigma)) l)
| PRel n ->
let id = try match lookup_name_of_rel n env with