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(* Coq 8.2beta4 *)
Require Import Classical_Prop.
Record coreSemantics : Type := CoreSemantics {
core: Type;
corestep: core -> core -> Prop;
corestep_fun: forall q q1 q2, corestep q q1 -> corestep q q2 -> q1 = q2
}.
Definition state : Type := {sem: coreSemantics & sem.(core)}.
Inductive step: state -> state -> Prop :=
| step_core: forall sem st st'
(Hcs: sem.(corestep) st st'),
step (existT _ sem st) (existT _ sem st').
Lemma step_fun: forall st1 st2 st2', step st1 st2 -> step st1 st2' -> st2 = st2'.
Proof.
intros.
inversion H; clear H; subst. inversion H0; clear H0; subst; auto.
generalize (inj_pairT2 _ _ _ _ _ H2); clear H2; intro; subst.
rewrite (corestep_fun _ _ _ _ Hcs Hcs0); auto.
Qed.
Record oe_core := oe_Core {
in_core: Type;
in_corestep: in_core -> in_core -> Prop;
in_corestep_fun: forall q q1 q2, in_corestep q q1 -> in_corestep q q2 -> q1 = q2;
in_q: in_core
}.
Definition oe2coreSem (oec : oe_core) : coreSemantics :=
CoreSemantics oec.(in_core) oec.(in_corestep) oec.(in_corestep_fun).
Definition oe_corestep (q q': oe_core) :=
step (existT _ (oe2coreSem q) q.(in_q)) (existT _ (oe2coreSem q') q'.(in_q)).
Lemma inj_pairT1: forall (U: Type) (P: U -> Type) (p1 p2: U) x y,
existT P p1 x = existT P p2 y -> p1=p2.
Proof. intros; injection H; auto.
Qed.
Definition f := CoreSemantics oe_core.
Lemma oe_corestep_fun: forall q q1 q2,
oe_corestep q q1 -> oe_corestep q q2 -> q1 = q2.
Proof.
unfold oe_corestep; intros.
assert (HH:= step_fun _ _ _ H H0); clear H H0.
destruct q1; destruct q2; unfold oe2coreSem; simpl in *.
generalize (inj_pairT1 _ _ _ _ _ _ HH); clear HH; intros.
injection H; clear H; intros.
revert in_q1 in_corestep1 in_corestep_fun1
H.
pattern in_core1.
apply eq_ind_r with (x := in_core0).
admit.
apply sym_eq.
(** good to here **)
Show Universes.
Print Universes.
Fail apply H0.
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