List/Dict remember and check their element type (#22005)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22005
When a Dict or List is created with type information, it will remember that.
If at any point later, this list is instantiated to a List<T> with a concrete type, it will assert that T is the correct type.
Differential Revision: D15914462
fbshipit-source-id: a8c3d91cb6d28d0c1ac0b57a4c4c6ac137153ff7
