Update crate-level attributes

src/lib.rs

@@ -1,20 +1,26 @@
 // SPDX-FileCopyrightText: slowtec GmbH
 // SPDX-License-Identifier: MPL-2.0
 
+// Opt-in for allowed-by-default lints (in alphabetical order)
+// See also: <https://doc.rust-lang.org/rustc/lints>
+#![warn(future_incompatible)]
+#![warn(let_underscore)]
+#![warn(missing_debug_implementations)]
 #![warn(rust_2018_idioms)]
 #![warn(rust_2021_compatibility)]
-#![warn(missing_debug_implementations)]
 #![warn(unreachable_pub)]
 #![warn(unsafe_code)]
-#![warn(rustdoc::broken_intra_doc_links)]
+#![warn(unused)]
+// Clippy lints
 #![warn(clippy::pedantic)]
 // Additional restrictions
 #![warn(clippy::clone_on_ref_ptr)]
 #![warn(clippy::missing_const_for_fn)]
-#![warn(clippy::self_named_module_files)]
+#![warn(clippy::mod_module_files)]
 // Repeating the type name in `..Default::default()` expressions
 // is not needed since the context is obvious.
 #![allow(clippy::default_trait_access)]
+// Opt-out of feature "std"
 #![cfg_attr(not(feature = "std"), no_std)]
 
 //! # semval