---

yaml
---
r: 209508
b: refs/heads/try
c: 00a8d65
h: refs/heads/master
v: v3

Author: steveklabnik

[refs]

@@ -2,7 +2,7 @@
 refs/heads/master: 3e561f05c00cd180ec02db4ccab2840a4aba93d2
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: ba0e1cd8147d452c356aacb29fb87568ca26f111
-refs/heads/try: 3908bae77b402623794370c976d6c2c2a3b699d4
+refs/heads/try: 00a8d65ef3389164f1c71ec95f686530fdfc9d9d
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/dist-snap: ba4081a5a8573875fed17545846f6f6902c8ba8d
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596

branches/try/src/doc/reference.md

@@ -2177,6 +2177,14 @@ The following configurations must be defined by the implementation:
 * `unix`. See `target_family`.
 * `windows`. See `target_family`.
 
+You can also set another attribute based on a `cfg` variable with `cfg_attr`:
+
+```rust,ignore
+#[cfg_attr(a, b)]
+```
+
+Will be the same as `#[b]` if `a` is set by `cfg`, and nothing otherwise.
+
 ### Lint check attributes
 
 A lint check names a potentially undesirable coding pattern, such as
@@ -2444,7 +2452,9 @@ The currently implemented features of the reference compiler are:
 * `simd_ffi` - Allows use of SIMD vectors in signatures for foreign functions.
                The SIMD interface is subject to change.
 
-* `staged_api` - Allows usage of stability markers and `#![staged_api]` in a crate
+* `staged_api` - Allows usage of stability markers and `#![staged_api]` in a
+                 crate. Stability markers are also attributes: `#[stable]`,
+                 `#[unstable]`, and `#[deprecated]` are the three levels.
 
 * `static_assert` - The `#[static_assert]` functionality is experimental and
                     unstable. The attribute can be attached to a `static` of