Commits on Jul 16, 2018

1. rustc: Stabilize much of the proc_macro feature …

   This commit stabilizes some of the `proc_macro` language feature as well as a
   number of APIs in the `proc_macro` crate as [previously discussed][1]. This
   means that on stable Rust you can now define custom procedural macros which
   operate as attributes attached to items or `macro_rules!`-like bang-style
   invocations. This extends the suite of currently stable procedural macros,
   custom derives, with custom attributes and custom bang macros.
   
   Note though that despite the stabilization in this commit procedural macros are
   still not usable on stable Rust. To stabilize that we'll need to stabilize at
   least part of the `use_extern_macros` feature. Currently you can define a
   procedural macro attribute but you can't import it to call it!
   
   A summary of the changes made in this PR (as well as the various consequences)
   is:
   
   * The `proc_macro` language and library features are now stable.
   * Other APIs not stabilized in the `proc_macro` crate are now named under a
     different feature, such as `proc_macro_diagnostic` or `proc_macro_span`.
   * A few checks in resolution for `proc_macro` being enabled have switched over
     to `use_extern_macros` being enabled. This means that code using
     `#![feature(proc_macro)]` today will likely need to move to
     `#![feature(use_extern_macros)]`.
   
   It's intended that this PR, once landed, will be followed up with an attempt to
   stabilize a small slice of `use_extern_macros` just for procedural macros to
   make this feature 100% usable on stable.
   
   [1]: https://internals.rust-lang.org/t/help-stabilize-a-subset-of-macros-2-0/7252

   

   alexcrichton committed Jul 16, 2018
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