[TRACKING] Highlighted issues for the feature freeze

[blyxyas]

👋 Hi contributor!

This is a list of issues that we as the Clippy team think you could start with as a new contributor for this feature freeze. As always, you can reach out for help in Zulip and we'll steer you into the right track!

This is an updating, dynamic list. We will be adding new issues to focus on all throughout the feature freeze period. Sometimes even pointing to starting points to fixing them!

Some important documentation links that I recommend you bookmark:

• The Clippy Book
• The rustc development guide]
• rustc_hir::hir documentation (rustdoc)
• The standard library documentation (rustdoc)
• The Clippy lint list

Note that to triage complex issues you can use cargo bisect-rustc and cargo minimize.

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Fix ICEs

Internal compiler errors, sometimes trickier because they may require some ancient compiler knowledge. They come with back

• I-ICE Issue: Clippy panicked, giving an Internal Compilation Error (ICE) ❄️

#14074 "Clippy cannot compile library on ARM64 ubuntu"

Fix suggestion bugs

• I-suggestion-causes-bug Issue: The suggestion compiles but changes the code to behave in an unintended way

• clippy::question_mark ignores #[cfg]-ed out statements in let-else #13642

• excessive_precision should not lint when it's so excessive as to be clearly intentional #13855

Fix suggestions that cause errors

• I-suggestion-causes-error Issue: The suggestions provided by this Lint cause an ICE/error when applied

• Garbage clippy::expect_fun_call lint for result.expect(if b { "" } else { "" }) #15056

• cargo clippy --fix generated broken code #9583

• cargo clippy --fix tries to apply mul_add but causes [E0689] #14897

Fix false positives

• I-false-positive Issue: The lint was triggered on code it shouldn't have

• False positive in unnecessary_to_owned when a mutable borrow would cause a compiler error #14918

• Stop suggesting alphabetic arrangement between different types of items (structs vs funcs vs mods etc) #14875

• Don't emit ptr_arg warning about unused function arguments #13728

• Stop triggering similar_names for 3-character names #14869 - Undesirable linting

• cast_possible_truncation suggestion problem #13814

• The exit lint is emitted for test target but not for bin target #13518

Fix lint issues with macros, constness and async

• T-macros Type: Issues with macros and macro expansion

• [literal_string_with_formatting_args] support for lazy_format #14894

• [allow(clippy::disallowed_macros)] fails for proc-macro attributes #13521 - not really beginner friendly, but macro related and interesting

• absolute_paths can trigger on code produced by a macro #13920

Configuration

• Rust unstable features needed for the kernel Rust-for-Linux/linux#2
• Stabilize tooling needed by Rust for Linux rust-project-goals#116

Documentation

• Add a chapter on how to review a lint in the book #15087

Completing the book would be greatly appreciated! Although I'm not sure if we have an issue for that...