Fix fast_parent_copy. The caching is now more solid than before (and doesn't produce weird side effects. This also solves an issue with Lambdas. However, by fixing all of this we have broken some other things.

jedi/evaluate/finder.py

@@ -92,8 +92,13 @@ class NameFinder(object):
 
                 # Exclude `arr[1] =` from the result set.
                 if not self._name_is_array_assignment(name):
+                    # TODO we ignore a lot of elements here that should not be
+                    #   ignored. But then again flow_analysis also stops when the
+                    #   input scope is reached. This is not correct: variables
+                    #   might still have conditions if defined outside of the
+                    #   current scope.
                     if isinstance(stmt, (pr.Param, pr.Import)) \
-                            or isinstance(name_list_scope, (pr.ListComprehension, er.Instance, InterpreterNamespace)) \
+                            or isinstance(name_list_scope, (pr.Lambda, pr.ListComprehension, er.Instance, InterpreterNamespace)) \
                             or isinstance(scope, compiled.CompiledObject) \
                             or isinstance(stmt, pr.Statement) and stmt.is_global():
                         # Always reachable.