Protect send: a panic safe feature for Ruby interaction

[danielpclark]

This is forked off of the eval PR. After ruby-sys is updated I'll fix the Cargo.toml file.

Provides

• Object#protect_send -> Result<AnyObject, AnyObject>
• Object#protect_public_send -> Result<AnyObject, AnyObject>

Methods can be called with these just like with send except instead of crashing when Ruby raises/throws an exception we can now handle the exception on the Err path.

TODO

• Wait for ruby-sys update and update Cargo.toml

[Antti]

@danielpclark Exciting! Do you need a help with this? Are we still waiting for ruby-sys ?

[danielpclark]

Thanks, I don't need help, and yes we're waiting for ruby-sys.

In the mean time I've got all my PRs here available to use from the playground branch of my fork https://github.com/danielpclark/ruru/tree/playground . Since some of my gem releases for FasterPath depend on it I won't be deleting that branch ever.