Commits on Mar 23, 2017

1. Remove internal liblog …

   This commit deletes the internal liblog in favor of the implementation that
   lives on crates.io. Similarly it's also setting a convention for adding crates
   to the compiler. The main restriction right now is that we want compiler
   implementation details to be unreachable from normal Rust code (e.g. requires a
   feature), and by default everything in the sysroot is reachable via `extern
   crate`.
   
   The proposal here is to require that crates pulled in have these lines in their
   `src/lib.rs`:
   
       #![cfg_attr(rustbuild, feature(staged_api, rustc_private))]
       #![cfg_attr(rustbuild, unstable(feature = "rustc_private", issue = "27812"))]
   
   This'll mean that by default they're not using these attributes but when
   compiled as part of the compiler they do a few things:
   
   * Mark themselves as entirely unstable via the `staged_api` feature and the
     `#![unstable]` attribute.
   * Allow usage of other unstable crates via `feature(rustc_private)` which is
     required if the crate relies on any other crates to compile (other than std).

   

   alexcrichton committed Mar 23, 2017
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