fix meet

Author: hauntsaninja

mypy/meet.py

@@ -90,10 +90,15 @@ def meet_types(s: Type, t: Type) -> ProperType:
             return t
 
     if not isinstance(s, UnboundType) and not isinstance(t, UnboundType):
+        swap = isinstance(s, Instance) and not isinstance(t, Instance)
+        if swap:
+            s, t = t, s
         if is_proper_subtype(s, t, ignore_promotions=True):
             return s
         if is_proper_subtype(t, s, ignore_promotions=True):
             return t
+        if swap:
+            s, t = t, s
 
     if isinstance(s, ErasedType):
         return s