rust-lang/rust-clippy

[lint idea] dangerous transmutes

Open

#546 opened on Jan 13, 2016

View on GitHub
 (11 comments) (0 reactions) (0 assignees)Rust (1,391 forks)batch import
A-lintT-middlegood first issue

Repository metrics

Stars
 (10,406 stars)
PR merge metrics
 (Avg merge 19d 22h) (113 merged PRs in 30d)

Description

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.

Contributor guide

Research direction
Investigate how to implement a lint that warns on transmute where source and target types are not both primitive or #[repr(C)]. Look at existing lint implementations in clippy for guidance.
Tech stack
rust
Domain
toolingdeveloper experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70