Fix unstable case in builtin_id.py test.

tests/basics/builtin_id.py

 print(id(1) == id(2))
 print(id(None) == id(None))
-print(id([]) == id([]))
+# This can't be true per Python semantics, just CPython implementation detail
+#print(id([]) == id([]))
 
 l = [1, 2]
 print(id(l) == id(l))