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-rw-r--r--toplevel/himsg.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/toplevel/himsg.ml b/toplevel/himsg.ml
index 13a6489b9d..ae6c86c8cc 100644
--- a/toplevel/himsg.ml
+++ b/toplevel/himsg.ml
@@ -307,6 +307,7 @@ let rec explain_unification_error env sigma p1 p2 = function
| CannotSolveConstraint ((pb,env,t,u),e) ->
let t = Evarutil.nf_evar sigma t in
let u = Evarutil.nf_evar sigma u in
+ let env = make_all_name_different env in
(strbrk "cannot satisfy constraint " ++ pr_lconstr_env env sigma t ++
str " == " ++ pr_lconstr_env env sigma u)
:: aux t u e