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(* This checks an error message as reported in bug #2172 *)
Axiom axiom : forall (E F : nat), E = F.
Lemma test : forall (E F : nat), E = F.
Proof.
intros.
(* This used to raise the following non understandable error message:
Error: Unable to find an instance for the variable x
The reason this error was that rewrite generated the proof
"eq_ind ?A ?x ?P ? ?y (axiom ?E ?F)"
and the equation ?x=?E was solved in the way ?E:=?x leaving ?x
unresolved. A stupid hack for solve this consisted in ordering
meta=meta equations the other way round (with most recent evars
instantiated first - since they are assumed to come first from the
user in rewrite/induction/destruct calls).
*)
Fail rewrite <- axiom.
Abort.
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