Provide local_bindings()?

[hadley]

No description provided.

[lionel-]

We'd reexport rlang::local_bindings()? Currently withr does not depend on rlang.

To properly do and undo the bindings, we need zap support to represent missing bindings, so I think this non-trivial functionality should have only one implementation and live in rlang.

In the previous discussion in #87 we decided to keep it in rlang only.

[hadley]

It's weird that it's the only local_ function that lives in rlang, and I just hit a package (evaluate) where it'd be nice to use it (it doesn't have an rlang dep)

[lionel-]

rlang has a bunch of local functions:

export(local_bindings)
export(local_error_call)
export(local_interactive)
export(local_options)
export(local_use_cli)

Wouldn't evaluate benefit from adding a dependency on rlang?