Sort attributes in compiler/rustc_errors/src/lib.rs.

As is already done in `rustc_span` and `rustc_data_structures`.

Author: nnethercote

compiler/rustc_errors/src/lib.rs

@@ -2,23 +2,25 @@
 //!
 //! This module contains the code for creating and emitting diagnostics.
 
+// tidy-alphabetical-start
+#![allow(incomplete_features)]
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(array_windows)]
 #![feature(associated_type_defaults)]
 #![feature(box_into_inner)]
 #![feature(box_patterns)]
+#![feature(error_reporter)]
 #![feature(extract_if)]
 #![feature(let_chains)]
 #![feature(negative_impls)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
-#![feature(yeet_expr)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
-#![feature(error_reporter)]
-#![allow(incomplete_features)]
-#![allow(internal_features)]
+#![feature(yeet_expr)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate rustc_macros;