Commits on Sep 9, 2019

1. std: Add a backtrace module …

   This commit adds a `backtrace` module to the standard library, as
   designed in [RFC 2504]. The `Backtrace` type is intentionally very
   conservative, effectively only allowing capturing it and printing it.
   
   Additionally this commit also adds a `backtrace` method to the `Error`
   trait which defaults to returning `None`, as specified in [RFC 2504].
   More information about the design here can be found in [RFC 2504] and in
   the [tracking issue].
   
   Implementation-wise this is all based on the `backtrace` crate and very
   closely mirrors the `backtrace::Backtrace` type on crates.io. Otherwise
   it's pretty standard in how it handles everything internally.
   
   [RFC 2504]: https://github.com/rust-lang/rfcs/blob/master/text/2504-fix-error.md
   [tracking issue]: rust-lang#53487
   
   cc rust-lang#53487

   

   alexcrichton committed Sep 9, 2019
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