Commits on Feb 24, 2016

1. rustc: Refactor how unstable flags are handled …

   This commit adds support for *truly* unstable options in the compiler, as well
   as adding warnings for the start of the deprecation path of
   unstable-but-not-really options. Specifically, the following behavior is now in
   place for handling unstable options:
   
   * As before, an unconditional error is emitted if an unstable option is passed
     and the `-Z unstable-options` flag is not present. Note that passing another
     `-Z` flag does not require passing `-Z unstable-options` as well.
   * New flags added to the compiler will be in the `Unstable` category as opposed
     to the `UnstableButNotReally` category which means they will unconditionally
     emit an error when used on stable.
   * All current flags are in a category where they will emit warnings when used
     that the option will soon be a hard error.
   
   Also as before, it is intended that `-Z` is akin to `#![feature]` in a crate
   where it is required to unlock unstable functionality. A nightly compiler which
   is used without any `-Z` flags should only be exercising stable behavior.

   

   alexcrichton committed Feb 24, 2016
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