.contextmanager: |F <: GenericCallable|(F) -> F
.closing!: |T|(thing: Structural { .close = (self: T) -> Obj }) => NoneType

.ExitStack!: ClassType
.ExitStack! <: ContextManager
.ExitStack!.
    __call__: () -> .ExitStack!
    enter_context!: (self: .ExitStack!, cm: ContextManager) => NoneType
    push!: (self: .ExitStack!, exit: GenericCallable) => NoneType
    callback!: (self: .ExitStack!, callback: GenericCallable) => NoneType
    pop_all!: (self: .ExitStack!) => [GenericCallable; _]
    close!: (self: .ExitStack!) => NoneType