Lint suggesting from_fn instead of while let Some(x) · rust-lang/rust-clippy#3940

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A-lintL-styleL-suggestiongood first issue

説明

With the release of 1.34 with the from_fn function, I'd like to propose a new lint that matches: while let Some(x) = expr and suggests replacing it with for x in from_fn(|| expr). (With a special-case for while let Some(x) = fn() that suggests for x in from_fn(fn) if possible.)

コントリビューターガイド

技術スタック: rust
領域: tooling
Issue 種別: feature
難度: 3
推定時間: 1-3 hours
活動状況: stale
明確さ: clear
前提条件: Rust programmingclippy contributing guide
初心者向け度: 70
調査方針: Examine existing clippy lints in the clippy lints crate to understand the structure for adding a new lint. The pattern to match is `while let Some(x) = expr` where `expr` is a function call. Refer to the std::iter::from fn documentation and clippy's developer guide for adding lints.