Fix an issue that comes from a combination of property/__slots__/pickle

jedi/parser/fast.py

@@ -62,6 +62,21 @@ class FastModule(pr.SubModule):
         return "<fast.%s: %s@%s-%s>" % (type(self).__name__, self.name,
                                         self.start_pos[0], self.end_pos[0])
 
+    # To avoid issues with with the `parser.Parser`, we need setters that do
+    # nothing, because if pickle comes along and sets those values.
+    @global_names.setter
+    def global_names(self, value):
+        pass
+
+    @error_statement_stacks.setter
+    def error_statement_stacks(self, value):
+        pass
+
+    @used_names.setter
+    def used_names(self, value):
+        pass
+
+
 
 class MergedNamesDict(object):
     def __init__(self, dicts):

jedi/parser/tree.py

@@ -614,7 +614,7 @@ class SubModule(Scope, Module):
     of a module.
     """
     __slots__ = ('path', 'global_names', 'used_names', '_name',
-                 'use_as_parent', 'error_statement_stacks')
+                 'error_statement_stacks')
     type = 'file_input'
 
     def __init__(self, children):
@@ -628,7 +628,6 @@ class SubModule(Scope, Module):
         """
         super(SubModule, self).__init__(children)
         self.path = None  # Set later.
-        # this may be changed depending on fast_parser
 
     @property
     @cache.underscore_memoization