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-rw-r--r--kernel/evd.ml4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/evd.ml b/kernel/evd.ml
index 52e1a936eb..dd387ddfb4 100644
--- a/kernel/evd.ml
+++ b/kernel/evd.ml
@@ -66,3 +66,7 @@ let is_defined sigma ev =
not (info.evar_body = Evar_empty)
let evar_hyps ev = get_globals (context ev.evar_env)
+
+let id_of_existential ev =
+ id_of_string ("?" ^ string_of_int ev)
+