diff options
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/rustc_attr_parsing/src/attributes/mod.rs | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/compiler/rustc_attr_parsing/src/attributes/mod.rs b/compiler/rustc_attr_parsing/src/attributes/mod.rs index c6ea15b2338..0225b141336 100644 --- a/compiler/rustc_attr_parsing/src/attributes/mod.rs +++ b/compiler/rustc_attr_parsing/src/attributes/mod.rs @@ -218,7 +218,14 @@ impl<S: Stage> OnDuplicate<S> { // them will be merged in another PR #[allow(unused)] pub(crate) enum AttributeOrder { - /// Duplicates after the first attribute will be an error. + /// Duplicates after the first attribute will be an error. I.e. only keep the lowest attribute. + /// + /// Attributes are processed from bottom to top, so this raises an error on all the attributes + /// further above the lowest one: + /// ``` + /// #[stable(since="1.0")] //~ WARNING duplicated attribute + /// #[stable(since="2.0")] + /// ``` /// /// This should be used where duplicates would be ignored, but carry extra /// meaning that could cause confusion. For example, `#[stable(since="1.0")] @@ -228,6 +235,13 @@ pub(crate) enum AttributeOrder { /// Duplicates preceding the last instance of the attribute will be a /// warning, with a note that this will be an error in the future. /// + /// Attributes are processed from bottom to top, so this raises a warning on all the attributes + /// below the higher one: + /// ``` + /// #[path="foo.rs"] + /// #[path="bar.rs"] //~ WARNING duplicated attribute + /// ``` + /// /// This is the same as `FutureWarnFollowing`, except the last attribute is /// the one that is "used". Ideally these can eventually migrate to /// `ErrorPreceding`. |