Commits on Sep 3, 2013

1. Implement support for indicating the stability of items. …

   There are 6 new compiler recognised attributes: deprecated, experimental,
   unstable, stable, frozen, locked (these levels are taken directly from
   Node's "stability index"[1]). These indicate the stability of the
   item to which they are attached; e.g. `#[deprecated] fn foo() { .. }`
   says that `foo` is deprecated.
   
   This comes with 3 lints for the first 3 levels (with matching names) that
   will detect the use of items marked with them (the `unstable` lint
   includes items with no stability attribute). The attributes can be given
   a short text note that will be displayed by the lint. An example:
   
       #[warn(unstable)]; // `allow` by default
   
       #[deprecated="use `bar`"]
       fn foo() { }
   
       #[stable]
       fn bar() { }
   
       fn baz() { }
   
       fn main() {
           foo(); // "warning: use of deprecated item: use `bar`"
   
           bar(); // all fine
   
           baz(); // "warning: use of unmarked item"
       }
   
   The lints currently only check the "edges" of the AST: i.e. functions,
   methods[2], structs and enum variants. Any stability attributes on modules,
   enums, traits and impls are not checked.
   
   [1]: http://nodejs.org/api/documentation.html
   [2]: the method check is currently incorrect and doesn't work.

   

   huonw committed Sep 3, 2013
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