chore: remove unnecessary file

src/Lean/Elab/Exception.lean

@@ -5,7 +5,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Leonardo de Moura
 -/
 import Lean.InternalExceptionId
-import Lean.Meta.Exception
+import Lean.Meta.Basic
 
 namespace Lean.Elab
 initialize postponeExceptionId : InternalExceptionId ← registerInternalExceptionId `postpone

src/Lean/Meta/Basic.lean

@@ -11,7 +11,6 @@ import Lean.Util.Trace
 import Lean.Util.RecDepth
 import Lean.Util.PPExt
 import Lean.Compiler.InlineAttrs
-import Lean.Meta.Exception
 import Lean.Meta.TransparencyMode
 import Lean.Meta.DiscrTreeTypes
 import Lean.Eval
@@ -30,6 +29,12 @@ They are packed into the MetaM monad.
 namespace Lean
 namespace Meta
 
+def registerIsDefEqStuckId : IO InternalExceptionId :=
+registerInternalExceptionId `isDefEqStuck
+
+@[init registerIsDefEqStuckId]
+constant isDefEqStuckExceptionId : InternalExceptionId := arbitrary _
+
 structure Config :=
 (foApprox           : Bool := false)
 (ctxApprox          : Bool := false)

src/Lean/Meta/Exception.lean

@@ -1,23 +0,0 @@
-/-
-Copyright (c) 2019 Microsoft Corporation. All rights reserved.
-Released under Apache 2.0 license as described in the file LICENSE.
-Authors: Leonardo de Moura
--/
-import Lean.Environment
-import Lean.MetavarContext
-import Lean.Message
-import Lean.CoreM
-import Lean.InternalExceptionId
-import Lean.Util.PPGoal
-
-namespace Lean
-namespace Meta
-
-def registerIsDefEqStuckId : IO InternalExceptionId :=
-registerInternalExceptionId `isDefEqStuck
-
-@[init registerIsDefEqStuckId]
-constant isDefEqStuckExceptionId : InternalExceptionId := arbitrary _
-
-end Meta
-end Lean