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Diffstat (limited to 'src')
| -rw-r--r-- | src/doc/reference.md | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/doc/reference.md b/src/doc/reference.md index 3b3c4ea6412..57110df0f9e 100644 --- a/src/doc/reference.md +++ b/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 |