Commits on Mar 26, 2016

1. std: Rewrite Once with poisoning …

   This commit rewrites the `std::sync::Once` primitive with poisoning in mind in
   light of rust-lang#31688. Currently a panic in the initialization closure will cause
   future initialization closures to run, but the purpose of a Once is usually to
   initialize some global state so it's highly likely that the global state is
   corrupt if a panic happened. The same strategy of a mutex is taken where a panic
   is propagated by default.
   
   A new API, `call_once_force`, was added to subvert panics like is available on
   Mutex as well (for when panicking is handled internally).
   
   Adding this support was a significant enough change to the implementation that
   it was just completely rewritten from scratch, primarily to avoid using a
   `StaticMutex` which needs to have `destroy()` called on it at some point (a pain
   to do).
   
   Closes rust-lang#31688

   

   alexcrichton committed Mar 26, 2016
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