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Stabilize `unsafe_op_in_unsafe_fn` lint This makes it possible to override the level of the `unsafe_op_in_unsafe_fn`, as proposed in https://github.com/rust-lang/rust/issues/71668#issuecomment-729770896. Tracking issue: #71668 r? ```@nikomatsakis``` cc ```@SimonSapin``` ```@RalfJung``` # Stabilization report This is a stabilization report for `#![feature(unsafe_block_in_unsafe_fn)]`. ## Summary Currently, the body of unsafe functions is an unsafe block, i.e. you can perform unsafe operations inside. The `unsafe_op_in_unsafe_fn` lint, stabilized here, can be used to change this behavior, so performing unsafe operations in unsafe functions requires an unsafe block. For now, the lint is allow-by-default, which means that this PR does not change anything without overriding the lint level. For more information, see [RFC 2585](https://github.com/rust-lang/rfcs/blob/master/text/2585-unsafe-block-in-unsafe-fn.md) ### Example ```rust // An `unsafe fn` for demonstration purposes. // Calling this is an unsafe operation. unsafe fn unsf() {} // #[allow(unsafe_op_in_unsafe_fn)] by default, // the behavior of `unsafe fn` is unchanged unsafe fn allowed() { // Here, no `unsafe` block is needed to // perform unsafe operations... unsf(); // ...and any `unsafe` block is considered // unused and is warned on by the compiler. unsafe { unsf(); } } #[warn(unsafe_op_in_unsafe_fn)] unsafe fn warned() { // Removing this `unsafe` block will // cause the compiler to emit a warning. // (Also, no "unused unsafe" warning will be emitted here.) unsafe { unsf(); } } #[deny(unsafe_op_in_unsafe_fn)] unsafe fn denied() { // Removing this `unsafe` block will // cause a compilation error. // (Also, no "unused unsafe" warning will be emitted here.) unsafe { unsf(); } } ``` |
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