diff --git a/compiler/rustc_abi/src/lib.rs b/compiler/rustc_abi/src/lib.rs
index b1a17d5a24b..a6662d4e0e4 100644
--- a/compiler/rustc_abi/src/lib.rs
+++ b/compiler/rustc_abi/src/lib.rs
@@ -1,7 +1,9 @@
-#![cfg_attr(feature = "nightly", feature(step_trait))]
+// tidy-alphabetical-start
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", doc(rust_logo))]
 #![cfg_attr(feature = "nightly", feature(rustdoc_internals))]
+#![cfg_attr(feature = "nightly", feature(step_trait))]
+// tidy-alphabetical-end
 
 use std::fmt;
 use std::num::{NonZeroUsize, ParseIntError};
diff --git a/compiler/rustc_arena/src/lib.rs b/compiler/rustc_arena/src/lib.rs
index bdbc59821de..810cb7a9f45 100644
--- a/compiler/rustc_arena/src/lib.rs
+++ b/compiler/rustc_arena/src/lib.rs
@@ -7,23 +7,25 @@
 //!
 //! This crate implements several kinds of arena.
 
+// tidy-alphabetical-start
+#![allow(clippy::mut_from_ref)] // Arena allocators are one place where this pattern is fine.
+#![allow(internal_features)]
+#![cfg_attr(test, feature(test))]
+#![deny(unsafe_op_in_unsafe_fn)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(no_crate_inject, attr(deny(warnings)))
 )]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(core_intrinsics)]
-#![feature(dropck_eyepatch)]
-#![feature(new_uninit)]
-#![feature(maybe_uninit_slice)]
 #![feature(decl_macro)]
+#![feature(dropck_eyepatch)]
+#![feature(maybe_uninit_slice)]
+#![feature(new_uninit)]
 #![feature(rustc_attrs)]
-#![cfg_attr(test, feature(test))]
+#![feature(rustdoc_internals)]
 #![feature(strict_provenance)]
-#![deny(unsafe_op_in_unsafe_fn)]
-#![allow(internal_features)]
-#![allow(clippy::mut_from_ref)] // Arena allocators are one of the places where this pattern is fine.
+// tidy-alphabetical-end
 
 use smallvec::SmallVec;
 
diff --git a/compiler/rustc_ast/src/lib.rs b/compiler/rustc_ast/src/lib.rs
index 63cde3c6809..7ca950e50e6 100644
--- a/compiler/rustc_ast/src/lib.rs
+++ b/compiler/rustc_ast/src/lib.rs
@@ -4,20 +4,22 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(deny(warnings)))
 )]
 #![doc(rust_logo)]
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
-#![feature(never_type)]
 #![feature(negative_impls)]
+#![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(stmt_expr_attributes)]
+// tidy-alphabetical-end
 
 pub mod util {
     pub mod case;
diff --git a/compiler/rustc_ast_ir/src/lib.rs b/compiler/rustc_ast_ir/src/lib.rs
index b1a77639b56..1d0c76f6cea 100644
--- a/compiler/rustc_ast_ir/src/lib.rs
+++ b/compiler/rustc_ast_ir/src/lib.rs
@@ -1,6 +1,8 @@
+// tidy-alphabetical-start
+#![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", feature(never_type))]
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
-#![cfg_attr(feature = "nightly", allow(internal_features))]
+// tidy-alphabetical-end
 
 #[cfg(feature = "nightly")]
 use rustc_macros::{Decodable, Encodable, HashStable_NoContext};
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
index 1c6b5b9af19..88f6e6c3b78 100644
--- a/compiler/rustc_ast_lowering/src/lib.rs
+++ b/compiler/rustc_ast_lowering/src/lib.rs
@@ -30,12 +30,14 @@
 //! get confused if the spans from leaf AST nodes occur in multiple places
 //! in the HIR, especially for multiple identifiers.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use crate::errors::{AssocTyParentheses, AssocTyParenthesesSub, MisplacedImplTrait};
 use rustc_ast::node_id::NodeMap;
diff --git a/compiler/rustc_ast_passes/src/lib.rs b/compiler/rustc_ast_passes/src/lib.rs
index 74d0fff2734..1f4bcd59afa 100644
--- a/compiler/rustc_ast_passes/src/lib.rs
+++ b/compiler/rustc_ast_passes/src/lib.rs
@@ -4,13 +4,15 @@
 //!
 //! The crate also contains other misc AST visitors, e.g. `node_count` and `show_span`.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(iter_is_partitioned)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 pub mod ast_validation;
 mod errors;
diff --git a/compiler/rustc_ast_pretty/src/lib.rs b/compiler/rustc_ast_pretty/src/lib.rs
index b9e217a21e3..84d9ce278a2 100644
--- a/compiler/rustc_ast_pretty/src/lib.rs
+++ b/compiler/rustc_ast_pretty/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(box_patterns)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod helpers;
 pub mod pp;
diff --git a/compiler/rustc_attr/src/lib.rs b/compiler/rustc_attr/src/lib.rs
index c61b7ea6d82..9cc53ad7ad8 100644
--- a/compiler/rustc_attr/src/lib.rs
+++ b/compiler/rustc_attr/src/lib.rs
@@ -4,10 +4,12 @@
 //! The goal is to move the definition of `MetaItem` and things that don't need to be in `syntax`
 //! to this crate.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod builtin;
 mod session_diagnostics;
diff --git a/compiler/rustc_baked_icu_data/src/lib.rs b/compiler/rustc_baked_icu_data/src/lib.rs
index ffcb290685a..e964a709757 100644
--- a/compiler/rustc_baked_icu_data/src/lib.rs
+++ b/compiler/rustc_baked_icu_data/src/lib.rs
@@ -20,10 +20,12 @@
 //! --cldr-tag latest --icuexport-tag latest -o src/data
 //! ```
 
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
+// tidy-alphabetical-start
 #![allow(elided_lifetimes_in_paths)]
+#![allow(internal_features)]
+#![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod data {
     include!("data/mod.rs");
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 1d5801467da..5c9826ecca7 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -1,7 +1,7 @@
 //! This query borrow-checks the MIR to (further) ensure it is not broken.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
@@ -10,8 +10,10 @@
 #![feature(min_specialization)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
+#![feature(rustdoc_internals)]
 #![feature(stmt_expr_attributes)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_builtin_macros/src/lib.rs b/compiler/rustc_builtin_macros/src/lib.rs
index 744c7f9d090..35b0f43d8af 100644
--- a/compiler/rustc_builtin_macros/src/lib.rs
+++ b/compiler/rustc_builtin_macros/src/lib.rs
@@ -1,12 +1,12 @@
 //! This crate contains implementations of built-in macros and other code generating facilities
 //! injecting code into the crate before it is lowered to HIR.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(decl_macro)]
@@ -15,7 +15,9 @@
 #![feature(lint_reasons)]
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 extern crate proc_macro;
 
diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs
index 39bbad16b0c..0fea3fd4253 100644
--- a/compiler/rustc_codegen_cranelift/src/lib.rs
+++ b/compiler/rustc_codegen_cranelift/src/lib.rs
@@ -1,13 +1,16 @@
-#![cfg_attr(doc, allow(internal_features))]
-#![cfg_attr(doc, feature(rustdoc_internals))]
-#![cfg_attr(doc, doc(rust_logo))]
-#![feature(rustc_private)]
-// Note: please avoid adding other feature gates where possible
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![cfg_attr(doc, allow(internal_features))]
+#![cfg_attr(doc, doc(rust_logo))]
+#![cfg_attr(doc, feature(rustdoc_internals))]
+// Note: please avoid adding other feature gates where possible
+#![feature(rustc_private)]
+// Note: please avoid adding other feature gates where possible
 #![warn(rust_2018_idioms)]
-#![warn(unused_lifetimes)]
 #![warn(unreachable_pub)]
+#![warn(unused_lifetimes)]
+// tidy-alphabetical-end
 
 extern crate jobserver;
 #[macro_use]
diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
index 0029ec9d09a..bb76d388393 100644
--- a/compiler/rustc_codegen_llvm/src/lib.rs
+++ b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -4,16 +4,18 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(exact_size_is_empty)]
 #![feature(extern_types)]
 #![feature(hash_raw_entry)]
+#![feature(impl_trait_in_assoc_type)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]
-#![feature(impl_trait_in_assoc_type)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use back::owned_target_machine::OwnedTargetMachine;
 use back::write::{create_informational_target_machine, create_target_machine};
diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index 3b1921d40e6..e801af40014 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -1,15 +1,17 @@
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(box_patterns)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(negative_impls)]
+#![feature(rustdoc_internals)]
 #![feature(strict_provenance)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
 //! The backend-agnostic functions of this crate use functions defined in various traits that
diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs
index 3a7c87c1cad..45ea3ec08f8 100644
--- a/compiler/rustc_const_eval/src/lib.rs
+++ b/compiler/rustc_const_eval/src/lib.rs
@@ -1,18 +1,20 @@
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(decl_macro)]
+#![feature(if_let_guard)]
 #![feature(let_chains)]
+#![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(slice_ptr_get)]
 #![feature(strict_provenance)]
-#![feature(never_type)]
 #![feature(trait_alias)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
-#![feature(if_let_guard)]
+// tidy-alphabetical-end
 
 pub mod check_consts;
 pub mod const_eval;
diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs
index acd93b0b2a6..a03834c519d 100644
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@@ -1,8 +1,10 @@
 // This crate is intentionally empty and a re-export of `rustc_driver_impl` to allow the code in
 // `rustc_driver_impl` to be compiled in parallel with other crates.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 pub use rustc_driver_impl::*;
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index fef4ce0b471..9acff4a0a26 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -4,16 +4,18 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(decl_macro)]
 #![feature(let_chains)]
 #![feature(panic_backtrace_config)]
 #![feature(panic_update_hook)]
 #![feature(result_flattening)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use rustc_ast as ast;
 use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults};
diff --git a/compiler/rustc_error_codes/src/lib.rs b/compiler/rustc_error_codes/src/lib.rs
index f4a33a05c1b..d13d5e1bca2 100644
--- a/compiler/rustc_error_codes/src/lib.rs
+++ b/compiler/rustc_error_codes/src/lib.rs
@@ -1,10 +1,12 @@
 //! This library is used to gather all error codes into one place, to make
 //! their maintenance easier.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
-#![doc(rust_logo)]
 #![deny(rustdoc::invalid_codeblock_attributes)]
+#![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 // This higher-order macro defines the error codes that are in use. It is used
 // in the `rustc_errors` crate. Removed error codes are listed in the comment
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 4eb4e77d69c..26a68454ab3 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -1,8 +1,10 @@
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![feature(rustc_attrs)]
-#![feature(type_alias_impl_trait)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
+#![doc(rust_logo)]
+#![feature(rustc_attrs)]
+#![feature(rustdoc_internals)]
+#![feature(type_alias_impl_trait)]
+// tidy-alphabetical-end
 
 use fluent_bundle::FluentResource;
 use fluent_syntax::parser::ParserError;
diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs
index 9db9073e2f0..fb3b7c0a127 100644
--- a/compiler/rustc_feature/src/lib.rs
+++ b/compiler/rustc_feature/src/lib.rs
@@ -11,9 +11,11 @@
 //! even if it is stabilized or removed, *do not remove it*. Instead, move the
 //! symbol to the `accepted` or `removed` modules respectively.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 mod accepted;
 mod builtin_attrs;
diff --git a/compiler/rustc_fluent_macro/src/lib.rs b/compiler/rustc_fluent_macro/src/lib.rs
index 2303785f94e..0a04e6743a8 100644
--- a/compiler/rustc_fluent_macro/src/lib.rs
+++ b/compiler/rustc_fluent_macro/src/lib.rs
@@ -1,10 +1,12 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::default_hash_types)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_span)]
-#![allow(rustc::default_hash_types)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use proc_macro::TokenStream;
 
diff --git a/compiler/rustc_fs_util/src/lib.rs b/compiler/rustc_fs_util/src/lib.rs
index d376c24cb58..5a9b15204d5 100644
--- a/compiler/rustc_fs_util/src/lib.rs
+++ b/compiler/rustc_fs_util/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
 use std::ffi::CString;
 use std::fs;
 use std::io;
 use std::path::{absolute, Path, PathBuf};
+// tidy-alphabetical-end
 
 // Unfortunately, on windows, it looks like msvcrt.dll is silently translating
 // verbatim paths under the hood to non-verbatim paths! This manifests itself as
diff --git a/compiler/rustc_graphviz/src/lib.rs b/compiler/rustc_graphviz/src/lib.rs
index 43bee5c4be0..c0fe98254f0 100644
--- a/compiler/rustc_graphviz/src/lib.rs
+++ b/compiler/rustc_graphviz/src/lib.rs
@@ -269,13 +269,15 @@
 //!
 //! * [DOT language](https://www.graphviz.org/doc/info/lang.html)
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
-#![feature(rustdoc_internals)]
 #![doc(rust_logo)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use LabelText::*;
 
diff --git a/compiler/rustc_hir/src/lib.rs b/compiler/rustc_hir/src/lib.rs
index 600a0dce03b..e517c3fd07a 100644
--- a/compiler/rustc_hir/src/lib.rs
+++ b/compiler/rustc_hir/src/lib.rs
@@ -2,13 +2,15 @@
 //!
 //! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/hir.html
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![feature(associated_type_defaults)]
 #![feature(closure_track_caller)]
 #![feature(let_chains)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
 #![feature(variant_count)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 extern crate self as rustc_hir;
 
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index 8fe81851f93..1927359421d 100644
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -55,21 +55,23 @@
 
 */
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::potential_query_instability)]
 #![allow(rustc::untranslatable_diagnostic)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(control_flow_enum)]
 #![feature(if_let_guard)]
 #![feature(is_sorted)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]
 #![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(slice_partition_dedup)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_hir_pretty/src/lib.rs b/compiler/rustc_hir_pretty/src/lib.rs
index 6f2febd86b0..d32d0183c4e 100644
--- a/compiler/rustc_hir_pretty/src/lib.rs
+++ b/compiler/rustc_hir_pretty/src/lib.rs
@@ -1,7 +1,9 @@
 //! HIR pretty-printing is layered on top of AST pretty-printing. A number of
 //! the definitions in this file have equivalents in `rustc_ast_pretty`.
 
+// tidy-alphabetical-start
 #![recursion_limit = "256"]
+// tidy-alphabetical-end
 
 use rustc_ast as ast;
 use rustc_ast::util::parser::{self, AssocOp, Fixity};
diff --git a/compiler/rustc_hir_typeck/src/lib.rs b/compiler/rustc_hir_typeck/src/lib.rs
index 86fe2756b59..b0fd6de3496 100644
--- a/compiler/rustc_hir_typeck/src/lib.rs
+++ b/compiler/rustc_hir_typeck/src/lib.rs
@@ -1,11 +1,13 @@
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
-#![feature(if_let_guard)]
-#![feature(let_chains)]
-#![feature(try_blocks)]
-#![feature(never_type)]
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
+#![feature(if_let_guard)]
+#![feature(let_chains)]
+#![feature(never_type)]
+#![feature(try_blocks)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_incremental/src/lib.rs b/compiler/rustc_incremental/src/lib.rs
index 960a2d012e0..76e3c0682de 100644
--- a/compiler/rustc_incremental/src/lib.rs
+++ b/compiler/rustc_incremental/src/lib.rs
@@ -1,10 +1,12 @@
 //! Support for serializing the dep-graph and reloading it.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![deny(missing_docs)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 mod assert_dep_graph;
 mod errors;
diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs
index 6fcb3a024ab..db6b250467e 100644
--- a/compiler/rustc_index/src/lib.rs
+++ b/compiler/rustc_index/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![cfg_attr(all(feature = "nightly", test), feature(stmt_expr_attributes))]
 #![cfg_attr(
     feature = "nightly",
     feature(extend_one, min_specialization, new_uninit, step_trait, test)
 )]
-#![cfg_attr(all(feature = "nightly", test), feature(stmt_expr_attributes))]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
+// tidy-alphabetical-end
 
 pub mod bit_set;
 #[cfg(feature = "nightly")]
diff --git a/compiler/rustc_index_macros/src/lib.rs b/compiler/rustc_index_macros/src/lib.rs
index 015518ae4d6..3e55dd82a6e 100644
--- a/compiler/rustc_index_macros/src/lib.rs
+++ b/compiler/rustc_index_macros/src/lib.rs
@@ -1,5 +1,7 @@
-#![cfg_attr(feature = "nightly", feature(allow_internal_unstable))]
+// tidy-alphabetical-start
 #![cfg_attr(feature = "nightly", allow(internal_features))]
+#![cfg_attr(feature = "nightly", feature(allow_internal_unstable))]
+// tidy-alphabetical-end
 
 use proc_macro::TokenStream;
 
diff --git a/compiler/rustc_infer/src/lib.rs b/compiler/rustc_infer/src/lib.rs
index 28d908abf83..b65ac859667 100644
--- a/compiler/rustc_infer/src/lib.rs
+++ b/compiler/rustc_infer/src/lib.rs
@@ -12,22 +12,24 @@
 //!
 //! This API is completely unstable and subject to change.
 
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]
 #![feature(extend_one)]
-#![feature(let_chains)]
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(iterator_try_collect)]
+#![feature(let_chains)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
 #![recursion_limit = "512"] // For rustdoc
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_interface/src/lib.rs b/compiler/rustc_interface/src/lib.rs
index 8b1d9b706ca..0c3d4e19ef8 100644
--- a/compiler/rustc_interface/src/lib.rs
+++ b/compiler/rustc_interface/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
 #![feature(decl_macro)]
 #![feature(let_chains)]
 #![feature(thread_spawn_unchecked)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 mod callbacks;
 mod errors;
diff --git a/compiler/rustc_lexer/src/lib.rs b/compiler/rustc_lexer/src/lib.rs
index 6f8a9792b6c..d4efb41eed0 100644
--- a/compiler/rustc_lexer/src/lib.rs
+++ b/compiler/rustc_lexer/src/lib.rs
@@ -19,9 +19,11 @@
 //!
 //! [`rustc_parse::lexer`]: ../rustc_parse/lexer/index.html
 
+// tidy-alphabetical-start
 // We want to be able to build this crate with a stable compiler,
 // so no `#![feature]` attributes should be added.
 #![deny(unstable_features)]
+// tidy-alphabetical-end
 
 mod cursor;
 pub mod unescape;
diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs
index bcb714ae4ce..7dae2de7bfb 100644
--- a/compiler/rustc_lint/src/lib.rs
+++ b/compiler/rustc_lint/src/lib.rs
@@ -25,9 +25,10 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![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(box_patterns)]
 #![feature(control_flow_enum)]
@@ -35,9 +36,10 @@
 #![feature(if_let_guard)]
 #![feature(iter_order_by)]
 #![feature(let_chains)]
-#![feature(trait_upcasting)]
 #![feature(rustc_attrs)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+#![feature(trait_upcasting)]
+// tidy-alphabetical-end
 
 mod async_fn_in_trait;
 pub mod builtin;
diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs
index 8bf25024afe..1ce95df3404 100644
--- a/compiler/rustc_lint_defs/src/lib.rs
+++ b/compiler/rustc_lint_defs/src/lib.rs
@@ -1,3 +1,4 @@
+// tidy-alphabetical-start
 pub use self::Level::*;
 use rustc_ast::node_id::NodeId;
 use rustc_ast::{AttrId, Attribute};
@@ -14,6 +15,7 @@
 use rustc_span::symbol::MacroRulesNormalizedIdent;
 use rustc_span::{sym, symbol::Ident, Span, Symbol};
 use rustc_target::spec::abi::Abi;
+// tidy-alphabetical-end
 
 use serde::{Deserialize, Serialize};
 
diff --git a/compiler/rustc_llvm/src/lib.rs b/compiler/rustc_llvm/src/lib.rs
index 6a570c97c88..2b50eac8b63 100644
--- a/compiler/rustc_llvm/src/lib.rs
+++ b/compiler/rustc_llvm/src/lib.rs
@@ -1,7 +1,9 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 // NOTE: This crate only exists to allow linking on mingw targets.
 
diff --git a/compiler/rustc_macros/src/lib.rs b/compiler/rustc_macros/src/lib.rs
index de9c916b4f0..9d7418cd370 100644
--- a/compiler/rustc_macros/src/lib.rs
+++ b/compiler/rustc_macros/src/lib.rs
@@ -1,3 +1,6 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::default_hash_types)]
 #![feature(allow_internal_unstable)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
@@ -5,8 +8,7 @@
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_span)]
 #![feature(proc_macro_tracked_env)]
-#![allow(rustc::default_hash_types)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 use synstructure::decl_derive;
 
diff --git a/compiler/rustc_mir_build/src/lib.rs b/compiler/rustc_mir_build/src/lib.rs
index a1b8b578349..66004179b10 100644
--- a/compiler/rustc_mir_build/src/lib.rs
+++ b/compiler/rustc_mir_build/src/lib.rs
@@ -1,5 +1,6 @@
 //! Construction of MIR from HIR.
 
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
 #![feature(assert_matches)]
@@ -7,6 +8,7 @@
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 mod build;
 mod check_unsafety;
diff --git a/compiler/rustc_mir_dataflow/src/lib.rs b/compiler/rustc_mir_dataflow/src/lib.rs
index 0b397a67d45..b0808ba2067 100644
--- a/compiler/rustc_mir_dataflow/src/lib.rs
+++ b/compiler/rustc_mir_dataflow/src/lib.rs
@@ -1,8 +1,10 @@
+// tidy-alphabetical-start
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
 #![feature(exact_size_is_empty)]
 #![feature(let_chains)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 use rustc_middle::ty;
 
diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index 551760f4703..3c0f4e9142b 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -1,8 +1,10 @@
+// tidy-alphabetical-start
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(const_type_name)]
 #![feature(cow_is_borrowed)]
 #![feature(decl_macro)]
+#![feature(if_let_guard)]
 #![feature(impl_trait_in_assoc_type)]
 #![feature(is_sorted)]
 #![feature(let_chains)]
@@ -12,7 +14,7 @@
 #![feature(round_char_boundary)]
 #![feature(try_blocks)]
 #![feature(yeet_expr)]
-#![feature(if_let_guard)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_monomorphize/src/lib.rs b/compiler/rustc_monomorphize/src/lib.rs
index eb5f8d92603..aa3b4cd5b67 100644
--- a/compiler/rustc_monomorphize/src/lib.rs
+++ b/compiler/rustc_monomorphize/src/lib.rs
@@ -1,5 +1,7 @@
+// tidy-alphabetical-start
 #![feature(array_windows)]
 #![feature(is_sorted)]
+// tidy-alphabetical-end
 
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::bug;
diff --git a/compiler/rustc_parse/src/lib.rs b/compiler/rustc_parse/src/lib.rs
index b316327a262..25cab7252a3 100644
--- a/compiler/rustc_parse/src/lib.rs
+++ b/compiler/rustc_parse/src/lib.rs
@@ -1,5 +1,6 @@
 //! The main parser interface.
 
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
@@ -9,6 +10,7 @@
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]
+// tidy-alphabetical-end
 
 use rustc_ast as ast;
 use rustc_ast::token;
diff --git a/compiler/rustc_parse_format/src/lib.rs b/compiler/rustc_parse_format/src/lib.rs
index ef71333d1c3..7e22644977d 100644
--- a/compiler/rustc_parse_format/src/lib.rs
+++ b/compiler/rustc_parse_format/src/lib.rs
@@ -4,14 +4,16 @@
 //! Parsing does not happen at runtime: structures of `std::fmt::rt` are
 //! generated instead.
 
+// tidy-alphabetical-start
+// We want to be able to build this crate with a stable compiler,
+// so no `#![feature]` attributes should be added.
+#![deny(unstable_features)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     html_playground_url = "https://play.rust-lang.org/",
     test(attr(deny(warnings)))
 )]
-// We want to be able to build this crate with a stable compiler,
-// so no `#![feature]` attributes should be added.
-#![deny(unstable_features)]
+// tidy-alphabetical-end
 
 use rustc_lexer::unescape;
 pub use Alignment::*;
diff --git a/compiler/rustc_passes/src/lib.rs b/compiler/rustc_passes/src/lib.rs
index 045a0a1525b..a0f5f98aafc 100644
--- a/compiler/rustc_passes/src/lib.rs
+++ b/compiler/rustc_passes/src/lib.rs
@@ -4,13 +4,15 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(let_chains)]
 #![feature(map_try_insert)]
+#![feature(rustdoc_internals)]
 #![feature(try_blocks)]
+// tidy-alphabetical-end
 
 use rustc_middle::query::Providers;
 
diff --git a/compiler/rustc_pattern_analysis/src/lib.rs b/compiler/rustc_pattern_analysis/src/lib.rs
index 4155540886a..c9590ad06b0 100644
--- a/compiler/rustc_pattern_analysis/src/lib.rs
+++ b/compiler/rustc_pattern_analysis/src/lib.rs
@@ -1,7 +1,9 @@
 //! Analysis of patterns, notably match exhaustiveness checking.
 
-#![allow(rustc::untranslatable_diagnostic)]
+// tidy-alphabetical-start
 #![allow(rustc::diagnostic_outside_of_impl)]
+#![allow(rustc::untranslatable_diagnostic)]
+// tidy-alphabetical-end
 
 pub mod constructor;
 #[cfg(feature = "rustc")]
diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs
index 698b28c626d..fb57d42f6df 100644
--- a/compiler/rustc_privacy/src/lib.rs
+++ b/compiler/rustc_privacy/src/lib.rs
@@ -1,10 +1,12 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(associated_type_defaults)]
-#![feature(try_blocks)]
 #![feature(let_chains)]
+#![feature(rustdoc_internals)]
+#![feature(try_blocks)]
+// tidy-alphabetical-end
 
 mod errors;
 
diff --git a/compiler/rustc_query_impl/src/lib.rs b/compiler/rustc_query_impl/src/lib.rs
index 85f55553af3..825c1e2e9bc 100644
--- a/compiler/rustc_query_impl/src/lib.rs
+++ b/compiler/rustc_query_impl/src/lib.rs
@@ -1,12 +1,14 @@
 //! Support for serializing the dep-graph and reloading it.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::potential_query_instability, unused_parens)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(min_specialization)]
 #![feature(rustc_attrs)]
-#![allow(rustc::potential_query_instability, unused_parens)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use crate::plumbing::{__rust_begin_short_backtrace, encode_all_query_results, try_mark_green};
 use crate::profiling_support::QueryKeyStringCache;
diff --git a/compiler/rustc_query_system/src/lib.rs b/compiler/rustc_query_system/src/lib.rs
index fa07877ab9f..41222e83f7c 100644
--- a/compiler/rustc_query_system/src/lib.rs
+++ b/compiler/rustc_query_system/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![allow(rustc::potential_query_instability, internal_features)]
 #![feature(assert_matches)]
 #![feature(core_intrinsics)]
 #![feature(hash_raw_entry)]
-#![feature(min_specialization)]
 #![feature(let_chains)]
-#![allow(rustc::potential_query_instability, internal_features)]
+#![feature(min_specialization)]
+// tidy-alphabetical-end
 
 pub mod cache;
 pub mod dep_graph;
diff --git a/compiler/rustc_sanitizers/src/lib.rs b/compiler/rustc_sanitizers/src/lib.rs
index 1f73e255490..e4792563e71 100644
--- a/compiler/rustc_sanitizers/src/lib.rs
+++ b/compiler/rustc_sanitizers/src/lib.rs
@@ -1,7 +1,11 @@
-#![feature(let_chains)]
 //! Sanitizers support for the Rust compiler.
 //!
 //! This crate contains the source code for providing support for the sanitizers to the Rust
 //! compiler.
+
+// tidy-alphabetical-start
+#![feature(let_chains)]
+// tidy-alphabetical-end
+
 pub mod cfi;
 pub mod kcfi;
diff --git a/compiler/rustc_serialize/src/lib.rs b/compiler/rustc_serialize/src/lib.rs
index 532b749f913..f0e1630c650 100644
--- a/compiler/rustc_serialize/src/lib.rs
+++ b/compiler/rustc_serialize/src/lib.rs
@@ -1,20 +1,22 @@
 //! Support code for encoding and decoding types.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::internal)]
+#![cfg_attr(test, feature(test))]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     html_playground_url = "https://play.rust-lang.org/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
 #![doc(rust_logo)]
-#![allow(internal_features)]
-#![feature(rustdoc_internals)]
 #![feature(const_option)]
 #![feature(core_intrinsics)]
 #![feature(min_specialization)]
 #![feature(never_type)]
 #![feature(ptr_sub_ptr)]
-#![cfg_attr(test, feature(test))]
-#![allow(rustc::internal)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 pub use self::serialize::{Decodable, Decoder, Encodable, Encoder};
 
diff --git a/compiler/rustc_session/src/lib.rs b/compiler/rustc_session/src/lib.rs
index cb02fbdfee9..d93b3eac080 100644
--- a/compiler/rustc_session/src/lib.rs
+++ b/compiler/rustc_session/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![feature(iter_intersperse)]
 #![feature(let_chains)]
+#![feature(map_many_mut)]
 #![feature(option_get_or_insert_default)]
 #![feature(rustc_attrs)]
-#![feature(map_many_mut)]
-#![feature(iter_intersperse)]
-#![allow(internal_features)]
+// tidy-alphabetical-end
 
 pub mod errors;
 
diff --git a/compiler/rustc_smir/src/lib.rs b/compiler/rustc_smir/src/lib.rs
index ddd5ea5510a..9f888875306 100644
--- a/compiler/rustc_smir/src/lib.rs
+++ b/compiler/rustc_smir/src/lib.rs
@@ -6,14 +6,16 @@
 //!
 //! This API is still completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::usage_of_ty_tykind)]
 #![doc(
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(attr(allow(unused_variables), deny(warnings)))
 )]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![allow(internal_features)]
-#![allow(rustc::usage_of_ty_tykind)]
+// tidy-alphabetical-end
 
 pub mod rustc_internal;
 
diff --git a/compiler/rustc_symbol_mangling/src/lib.rs b/compiler/rustc_symbol_mangling/src/lib.rs
index 745ae41085b..e65d3080a0a 100644
--- a/compiler/rustc_symbol_mangling/src/lib.rs
+++ b/compiler/rustc_symbol_mangling/src/lib.rs
@@ -87,11 +87,13 @@
 //! virtually impossible. Thus, symbol hash generation exclusively relies on
 //! DefPaths which are much more robust in the face of changes to the code base.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
 #![feature(let_chains)]
-#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
diff --git a/compiler/rustc_trait_selection/src/lib.rs b/compiler/rustc_trait_selection/src/lib.rs
index 381da6f7e2a..50c618bb3bd 100644
--- a/compiler/rustc_trait_selection/src/lib.rs
+++ b/compiler/rustc_trait_selection/src/lib.rs
@@ -10,12 +10,12 @@
 //!
 //! This API is completely unstable and subject to change.
 
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
+// tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
@@ -24,8 +24,10 @@
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(never_type)]
+#![feature(rustdoc_internals)]
 #![feature(type_alias_impl_trait)]
 #![recursion_limit = "512"] // For rustdoc
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
diff --git a/compiler/rustc_traits/src/lib.rs b/compiler/rustc_traits/src/lib.rs
index bc5436f76f1..fdeda34d294 100644
--- a/compiler/rustc_traits/src/lib.rs
+++ b/compiler/rustc_traits/src/lib.rs
@@ -1,6 +1,8 @@
 //! Queries that are independent from the main solver code.
 
+// tidy-alphabetical-start
 #![recursion_limit = "256"]
+// tidy-alphabetical-end
 
 mod codegen;
 mod dropck_outlives;
diff --git a/compiler/rustc_transmute/src/lib.rs b/compiler/rustc_transmute/src/lib.rs
index ffebf7b0721..2b052412e6b 100644
--- a/compiler/rustc_transmute/src/lib.rs
+++ b/compiler/rustc_transmute/src/lib.rs
@@ -1,6 +1,8 @@
+// tidy-alphabetical-start
+#![allow(unused_variables)]
 #![feature(alloc_layout_extra)]
 #![feature(never_type)]
-#![allow(unused_variables)]
+// tidy-alphabetical-end
 
 pub(crate) use rustc_data_structures::fx::{FxIndexMap as Map, FxIndexSet as Set};
 
diff --git a/compiler/rustc_ty_utils/src/lib.rs b/compiler/rustc_ty_utils/src/lib.rs
index bd89265d942..ad0bcbfbbc2 100644
--- a/compiler/rustc_ty_utils/src/lib.rs
+++ b/compiler/rustc_ty_utils/src/lib.rs
@@ -4,10 +4,10 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![allow(internal_features)]
 #![feature(assert_matches)]
 #![feature(associated_type_defaults)]
 #![feature(box_patterns)]
@@ -15,6 +15,8 @@
 #![feature(iterator_try_collect)]
 #![feature(let_chains)]
 #![feature(never_type)]
+#![feature(rustdoc_internals)]
+// tidy-alphabetical-end
 
 use rustc_middle::query::Providers;
 
diff --git a/compiler/rustc_type_ir/src/lib.rs b/compiler/rustc_type_ir/src/lib.rs
index 73716468930..7072b3de07d 100644
--- a/compiler/rustc_type_ir/src/lib.rs
+++ b/compiler/rustc_type_ir/src/lib.rs
@@ -1,9 +1,11 @@
+// tidy-alphabetical-start
+#![allow(rustc::usage_of_ty_tykind)]
 #![cfg_attr(
     feature = "nightly",
     feature(associated_type_defaults, min_specialization, never_type, rustc_attrs, negative_impls)
 )]
-#![allow(rustc::usage_of_ty_tykind)]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
+// tidy-alphabetical-end
 
 #[cfg(feature = "nightly")]
 extern crate self as rustc_type_ir;