Shuttle support for std::sync

This crate contains the wrapper that enables testing of applications that use std::sync with Shuttle.

How to use

To use it, add the following in your Cargo.toml:

[features]
shuttle = [
   "shuttle-sync/shuttle",
]

[dependencies]
shuttle-sync = "VERSION_NUMBER"

Then swap usages of std::sync with shuttle_sync::sync. The code will behave as before when the shuttle feature flag is not provided, and will run with Shuttle-compatible primitives when the shuttle feature flag is provided.