The position modifier is not used anymore.

jedi/parser/tree.py

@@ -40,7 +40,7 @@ import textwrap
 import abc
 
 from jedi._compatibility import (Python3Method, encoding, is_py3, utf8_repr,
-                                 literal_eval, use_metaclass, unicode)
+                                 literal_eval, unicode)
 from jedi.parser.utils import underscore_memoization
 
 
@@ -81,12 +81,6 @@ def search_ancestor(node, node_type_or_types):
             return node
 
 
-class PositionModifier(object):
-    """A start_pos modifier for the fast parser."""
-    def __init__(self):
-        self.line = 0
-
-
 class DocstringMixin(object):
     __slots__ = ()