chore: add Rewrite.lean

src/Lean/Elab/Tactic.lean

@@ -11,3 +11,4 @@ import Lean.Elab.Tactic.Generalize
 import Lean.Elab.Tactic.Injection
 import Lean.Elab.Tactic.Match
 import Lean.Elab.Tactic.Binders
+import Lean.Elab.Tactic.Rewrite

src/Lean/Elab/Tactic/Rewrite.lean

@@ -0,0 +1,21 @@
+/-
+Copyright (c) 2020 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Authors: Leonardo de Moura
+-/
+import Lean.Elab.Tactic.Basic
+import Lean.Elab.Tactic.ElabTerm
+
+namespace Lean
+namespace Elab
+namespace Tactic
+
+@[builtinMacro Lean.Parser.Tactic.rewriteSeq] def expandRewriteTactic : Macro :=
+fun stx => throw $ Macro.Exception.error stx "WIP"
+
+@[builtinTactic «rewrite»] def evalRewrite : Tactic :=
+fun stx => throwError "WIP"
+
+end Tactic
+end Elab
+end Lean