RUSTSEC-2020-0151: Generators can cause data races if non-Send types are used in their generator functions

[github-actions]

Generators can cause data races if non-Send types are used in their generator functions

Details
Package	generator
Version	0.6.25
URL	Xudong-Huang/generator-rs#27
Date	2020-11-16
Patched versions	>=0.7.0

The Generator type is an iterable which uses a generator function that yields
values. In affected versions of the crate, the provided function yielding values
had no Send bounds despite the Generator itself implementing Send.

The generator function lacking a Send bound means that types that are
dangerous to send across threads such as Rc could be sent as part of a
generator, potentially leading to data races.

This flaw was fixed in commit f7d120a3b
by enforcing that the generator function be bound by Send.

See advisory page for additional details.

[taiki-e]

closing in favor of tokio-rs/loom#198