No weak pointers?

[milibopp]

According to @acrichton weak pointers won't be stabilized for 1.0. Internally this crate makes heavy use of them, so it is unlikely that it will be ready to use for 1.0.

Ideas to get around this

• Shipping own Weak<T>: Would not be exposed, so could be done as a mere implementation detail. Also fairly easy to do (just copy & paste from stdlib).
• Lifetime bounds instead of ref-counting: Good for performance, but it might make the library slightly harder to use, as this will propagate into the API. This approach is radically different and goes into afaik unexplored terrain for FRP libraries. Requires some experimentation.

[milibopp]

Shipping own Weak<T> appears to be unfeasible, because the building blocks of the arc module are still unstable. See the out-of-tree implementation on this branch.

[jakerr]

Heads up! rust-lang/rust#27718 just went into final-comment-period for stabilizing arc_weak, rc_weak etc.

[milibopp]

Oh, that's nice. Thank you for the notification! Looking forward to finally bring carboxyl to stable Rust ;)