Update error code docs

Author: jhpratt

compiler/rustc_error_codes/src/error_codes/E0539.md

@@ -6,7 +6,7 @@ Erroneous code example:
 #![feature(staged_api)]
 #![stable(since = "1.0.0", feature = "test")]
 
-#[rustc_deprecated(reason)] // error!
+#[deprecated(note)] // error!
 #[unstable(feature = "deprecated_fn", issue = "123")]
 fn deprecated() {}
 
@@ -30,7 +30,7 @@ To fix these issues you need to give required key-value pairs.
 #![feature(staged_api)]
 #![stable(since = "1.0.0", feature = "test")]
 
-#[rustc_deprecated(since = "1.39.0", reason = "reason")] // ok!
+#[deprecated(since = "1.39.0", note = "reason")] // ok!
 #[unstable(feature = "deprecated_fn", issue = "123")]
 fn deprecated() {}
 

compiler/rustc_error_codes/src/error_codes/E0542.md

@@ -13,8 +13,8 @@ fn _stable_fn() {}
 const fn _stable_const_fn() {}
 
 #[stable(feature = "_deprecated_fn", since = "0.1.0")]
-#[rustc_deprecated(
-    reason = "explanation for deprecation"
+#[deprecated(
+    note = "explanation for deprecation"
 )] // invalid
 fn _deprecated_fn() {}
 ```
@@ -32,9 +32,9 @@ fn _stable_fn() {}
 const fn _stable_const_fn() {}
 
 #[stable(feature = "_deprecated_fn", since = "0.1.0")]
-#[rustc_deprecated(
+#[deprecated(
     since = "1.0.0",
-    reason = "explanation for deprecation"
+    note = "explanation for deprecation"
 )] // ok!
 fn _deprecated_fn() {}
 ```

compiler/rustc_error_codes/src/error_codes/E0543.md

@@ -1,4 +1,4 @@
-The `reason` value is missing in a stability attribute.
+The `note` value is missing in a stability attribute.
 
 Erroneous code example:
 
@@ -7,22 +7,22 @@ Erroneous code example:
 #![stable(since = "1.0.0", feature = "test")]
 
 #[stable(since = "0.1.0", feature = "_deprecated_fn")]
-#[rustc_deprecated(
+#[deprecated(
     since = "1.0.0"
 )] // invalid
 fn _deprecated_fn() {}
 ```
 
-To fix this issue, you need to provide the `reason` field. Example:
+To fix this issue, you need to provide the `note` field. Example:
 
 ```
 #![feature(staged_api)]
 #![stable(since = "1.0.0", feature = "test")]
 
 #[stable(since = "0.1.0", feature = "_deprecated_fn")]
-#[rustc_deprecated(
+#[deprecated(
     since = "1.0.0",
-    reason = "explanation for deprecation"
+    note = "explanation for deprecation"
 )] // ok!
 fn _deprecated_fn() {}
 ```

compiler/rustc_error_codes/src/error_codes/E0549.md

@@ -1,15 +1,15 @@
-A `rustc_deprecated` attribute wasn't paired with a `stable`/`unstable`
-attribute.
+A `deprecated` attribute wasn't paired with a `stable`/`unstable` attribute with
+`#![feature(staged_api)]` enabled.
 
 Erroneous code example:
 
 ```compile_fail,E0549
 #![feature(staged_api)]
 #![stable(since = "1.0.0", feature = "test")]
 
-#[rustc_deprecated(
+#[deprecated(
     since = "1.0.1",
-    reason = "explanation for deprecation"
+    note = "explanation for deprecation"
 )] // invalid
 fn _deprecated_fn() {}
 ```
@@ -22,9 +22,9 @@ Example:
 #![stable(since = "1.0.0", feature = "test")]
 
 #[stable(since = "1.0.0", feature = "test")]
-#[rustc_deprecated(
+#[deprecated(
     since = "1.0.1",
-    reason = "explanation for deprecation"
+    note = "explanation for deprecation"
 )] // ok!
 fn _deprecated_fn() {}
 ```

compiler/rustc_error_codes/src/error_codes/E0734.md

@@ -3,7 +3,6 @@ A stability attribute has been used outside of the standard library.
 Erroneous code example:
 
 ```compile_fail,E0734
-#[rustc_deprecated(since = "b", reason = "text")] // invalid
 #[stable(feature = "a", since = "b")] // invalid
 #[unstable(feature = "b", issue = "none")] // invalid
 fn foo(){}

compiler/rustc_lint_defs/src/builtin.rs

@@ -2206,7 +2206,7 @@ declare_lint! {
     /// and then this lint will ensure that the item is no longer used in the
     /// standard library. See the [stability documentation] for more details.
     ///
-    /// [stability documentation]: https://rustc-dev-guide.rust-lang.org/stability.html#rustc_deprecated
+    /// [stability documentation]: https://rustc-dev-guide.rust-lang.org/stability.html#deprecated
     pub DEPRECATED_IN_FUTURE,
     Allow,
     "detects use of items that will be deprecated in a future version",