Fix most instance related issues.

jedi/evaluate/finder.py

@@ -92,7 +92,8 @@ class NameFinder(object):
         # Only the names defined in the last position are valid definitions.
         last_names = []
         for name in reversed(sorted(names, key=lambda name: name.start_pos)):
-            if isinstance(name, compiled.CompiledName):
+            if isinstance(name, compiled.CompiledName) \
+                    or isinstance(name, er.InstanceName) and isinstance(name._origin_name, compiled.CompiledName):
                 last_names.append(name)
                 continue
 
@@ -102,6 +103,7 @@ class NameFinder(object):
                 origin_scope = None
             stmt = name.get_definition()
             if isinstance(stmt.parent, compiled.CompiledObject):
+                # TODO seriously? this is stupid.
                 continue
             check = flow_analysis.break_check(self._evaluator, scope, stmt, origin_scope)
             if check is not flow_analysis.UNREACHABLE:

jedi/evaluate/representation.py

@@ -235,7 +235,7 @@ class Instance(use_metaclass(CachedMetaClass, Executed)):
         args = [obj, obj.base] if isinstance(obj, Instance) else [compiled.none_obj, obj]
         return self.execute_subscope_by_name('__get__', *args)
 
-    @memoize_default([])
+    @underscore_memoization
     def names_dicts(self):
         yield self._self_names_dict()
 
@@ -321,7 +321,7 @@ def get_instance_el(evaluator, instance, var, is_class_var=False):
         if isinstance(var, pr.Name):
             # TODO temp solution, remove later, Name should never get
             #     here?
-            parent = get_instance_el(evaluator, instance, var.parent)
+            parent = get_instance_el(evaluator, instance, var.parent, is_class_var)
             return InstanceName(var, parent)
         return var