[lint idea] dangerous transmutes · rust-lang/rust-clippy#546

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A-lintT-middlegood first issue

説明

Along the lines of useless_transmute, it seems plausible to warn on transmute::<X, Y>(x) where X and Y aren't both primitive types or marked #[repr(C)], since as @ubsan keeps reminding us this is likely to cause UB.

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: 3-5 days
活動状況: stale
明確さ: clear
前提条件: Rust programmingClippy internalstransmute semantics
初心者向け度: 50
調査方針: Look at the existing `useless transmute` lint in the clippy source code (likely in `clippy lints/src/transmute.rs`) to understand the pattern. Identify where to add a new lint check for transmutes where both types are not primitive or `#[repr(C)]`. The issue comments may contain additional context, such as concerns about false positives. Also, review the clippy lint registration and testing guidelines in the repository documentation.