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+(* Ensure order of hypotheses is respected after "subst" *)
+
+Set Regular Subst Tactic.
+Goal forall x y z, x = 0 -> y = 0 -> z = 0 -> x = 1 -> True -> x = 2 -> y = 3 -> True -> z = 4 -> True.
+intros * Hx Hy Hz H1 HA H2 H3 HB H4.
+(* From now on, the order after subst is consistently H1, HA, H2, H3, HB, H4 *)
+subst x.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was HA, H3, HB, H4, H1, H2 *)
+Show.
+Undo.
+subst y.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was H1, HA, H2, HB, H4, H3 *)
+Show.
+Undo.
+subst z.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was H1, HA, H2, H3, HB, H4 *)
+Show.
+Undo.
+subst.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was HA, HB, H4, H3, H1, H2 *)
+(* In 8.5pl0 and 8.5pl1 with regular subst tactic mode, the order was HA, HB, H1, H2, H3, H4 *)
+Show.
+trivial.
+Qed.
+
+Unset Regular Subst Tactic.
+Goal forall x y z, x = 0 -> y = 0 -> z = 0 -> x = 1 -> True -> x = 2 -> y = 3 -> True -> z = 4 -> True.
+intros * Hx Hy Hz H1 HA H2 H3 HB H4.
+subst x.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was HA, H3, HB, H4, H1, H2 *)
+Show.
+Undo.
+subst y.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was H1, HA, H2, HB, H4, H3 *)
+Show.
+Undo.
+subst z.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was H1, HA, H2, H3, HB, H4 *)
+Show.
+Undo.
+subst.
+(* In 8.4 or 8.5 without regular subst tactic mode, the order was HA, HB, H4, H3, H1, H2 *)
+(* In 8.5pl0 and 8.5pl1 with regular subst tactic mode, the order was HA, HB, H1, H2, H3, H4 *)
+Show.
+trivial.
+Qed.
+
+