From 637f12110979999afc3bab3afbd514ce5e651bd2 Mon Sep 17 00:00:00 2001
From: night199uk <night199uk@hermitcrabslab.com>
Date: Fri, 14 Dec 2018 12:49:29 +0100
Subject: [PATCH] Cleanup unused Derivation

---
 lark/parsers/earley_common.py | 17 -----------------
 lark/parsers/earley_forest.py |  1 -
 2 files changed, 18 deletions(-)

diff --git a/lark/parsers/earley_common.py b/lark/parsers/earley_common.py
index 74dd388..e13c7c3 100644
--- a/lark/parsers/earley_common.py
+++ b/lark/parsers/earley_common.py
@@ -13,23 +13,6 @@
 # Author: Erez Shinan (2017)
 # Email : erezshin@gmail.com
 
-## for recursive repr
-from ..tree import Tree
-
-class Derivation(Tree):
-    def __init__(self, rule, children = None):
-        Tree.__init__(self, 'drv', children if children is not None else [])
-        self.meta.rule = rule
-        self._hash = None
-
-    def __repr__(self, indent = 0):
-        return 'Derivation(%s, %s, %s)' % (self.data, self.rule.origin, '...')
-
-    def __hash__(self):
-        if self._hash is None:
-            self._hash = Tree.__hash__(self)
-        return self._hash
-
 class Item(object):
     "An Earley Item, the atom of the algorithm."
 
diff --git a/lark/parsers/earley_forest.py b/lark/parsers/earley_forest.py
index 730ebe1..f6bea75 100644
--- a/lark/parsers/earley_forest.py
+++ b/lark/parsers/earley_forest.py
@@ -13,7 +13,6 @@ from ..exceptions import ParseError
 from ..lexer import Token
 from ..utils import Str
 from ..grammar import NonTerminal, Terminal
-from .earley_common import Derivation
 
 from collections import deque
 from importlib import import_module