Simon Sapin 59a340963f Add the Layout of the failed allocation to TryReserveError::AllocError
… and add a separately-unstable field to force non-exhaustive matching
(`#[non_exhaustive]` is no implemented yet on enum variants)
so that we have the option to later expose the allocator’s error value.

CC https://github.com/rust-lang/wg-allocators/issues/23
2019-08-16 18:08:37 +02:00
..