removed 'easy' to 'done' replacements

misc/stdpp_tactics.v

@@ -0,0 +1,36 @@
+From Coq Require Export RelationClasses Relation_Definitions Lia.
+
+Module FastDoneTactic.
+
+Lemma not_symmetry {A} `{R : relation A, !Symmetric R} x y : ~ R x y -> ~ R y x.
+Proof. intuition. Qed.
+
+Ltac fast_done :=
+  solve
+    [ eassumption
+    | symmetry; eassumption
+    | apply not_symmetry; eassumption
+    | reflexivity ].
+Tactic Notation "fast_by" tactic(tac) :=
+  tac; fast_done.
+
+End FastDoneTactic.
+
+Import FastDoneTactic.
+
+Ltac done :=
+  solve
+  [ repeat first
+    [ fast_done
+    | solve [trivial]
+    (* All the tactics below will introduce themselves anyway, or make no sense
+       for goals of product type. So this is a good place for us to do it. *)
+    | progress intros
+    | solve [symmetry; trivial]
+    | solve [apply not_symmetry; trivial]
+    | discriminate
+    | contradiction
+    | split
+    | match goal with H : ~ _ |- _ => case H; clear H; fast_done end ]
+  ].
+