Update rt_subtype.py

Author: BobTheBuidler

mypyc/rt_subtype.py

@@ -27,6 +27,8 @@
     RVoid,
     is_bit_rprimitive,
     is_bool_rprimitive,
+    is_dict_rprimitive,
+    is_exact_dict_rprimitive,
     is_int_rprimitive,
     is_short_int_rprimitive,
 )
@@ -58,6 +60,8 @@ def visit_rprimitive(self, left: RPrimitive) -> bool:
             return True
         if is_bit_rprimitive(left) and is_bool_rprimitive(self.right):
             return True
+        if is_exact_dict_rprimitive(left) and is_dict_rprimitive(self.right):
+            return True
         return left is self.right
 
     def visit_rtuple(self, left: RTuple) -> bool: