diff --git a/lark/lark.py b/lark/lark.py
index 8d34b21..4445e6f 100644
--- a/lark/lark.py
+++ b/lark/lark.py
@@ -117,9 +117,6 @@ class Lark:
             self.source = grammar.name
         except AttributeError:
             self.source = '<string>'
-            cache_file = "larkcache_%s" % str(hash(grammar)%(2**32))
-        else:
-            cache_file = "larkcache_%s" % os.path.basename(self.source)
 
         # Drain file-like objects to get their contents
         try:
diff --git a/lark/reconstruct.py b/lark/reconstruct.py
index 1ab679e..1fa6c7b 100644
--- a/lark/reconstruct.py
+++ b/lark/reconstruct.py
@@ -101,10 +101,7 @@ class Reconstructor:
         for origin, rule_aliases in aliases.items():
             for alias in rule_aliases:
                 yield Rule(origin, [Terminal(alias)], alias=MakeMatchTree(origin.name, [NonTerminal(alias)]))
-            
             yield Rule(origin, [Terminal(origin.name)], alias=MakeMatchTree(origin.name, [origin]))
-        
-
 
     def _match(self, term, token):
         if isinstance(token, Tree):
@@ -128,4 +125,3 @@ class Reconstructor:
 
     def reconstruct(self, tree):
         return ''.join(self._reconstruct(tree))
-
diff --git a/lark/tools/standalone.py b/lark/tools/standalone.py
index 1cc08a6..99ee73c 100644
--- a/lark/tools/standalone.py
+++ b/lark/tools/standalone.py
@@ -45,9 +45,7 @@ from collections import defaultdict
 
 import lark
 from lark import Lark
-from lark.parsers.lalr_analysis import Shift, Reduce
-
-from ..grammar import Rule
+from lark.parsers.lalr_analysis import Reduce
 
 _dir = path.dirname(__file__)
 _larkdir = path.join(_dir, path.pardir)