Fix some inconsistencies with accessing the first argument of methods

If the current class is a metaclass (inherits from `type`), then
the first argument is always a class, not an instance.

1 files changed, 10 insertions, 0 deletions

diff --git a/astroid/arguments.py b/astroid/arguments.py
index 5670fa86..e80f5f40 100644
--- a/astroid/arguments.py
+++ b/astroid/arguments.py
@@ -183,6 +183,16 @@ class CallSite(object):
                 else:
                     # XXX can do better ?
                     boundnode = funcnode.parent.frame()
+                
+                if isinstance(boundnode, nodes.ClassDef):
+                    # Verify that we're accessing a method
+                    # of the metaclass through a class, as in
+                    # `cls.metaclass_method`. In this case, the
+                    # first argument is always the class. 
+                    method_scope = funcnode.parent.scope()
+                    if method_scope is boundnode.metaclass():
+                        return iter((boundnode, ))
+
                 if funcnode.type == 'method':
                     if not isinstance(boundnode, bases.Instance):
                         boundnode = bases.Instance(boundnode)