Fix class/def/class nesting definitions

Fixes #932.

test/completion/lambdas.py

@@ -65,6 +65,8 @@ class C():
     def with_param(self):
         return lambda x: x + self.a()
 
+    lambd = lambda self: self.foo
+
 #? int()
 C().a()
 
@@ -75,6 +77,11 @@ index = C().with_param()(1)
 #? float()
 ['', 1, 1.0][index]
 
+#? float()
+C().lambd()
+#? int()
+C(1).lambd()
+
 
 def xy(param):
     def ret(a, b):