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sinkuu 2017-11-01 23:29:40 +09:00
parent b9f272cdc2
commit 0328d4c6e5
1 changed files with 11 additions and 2 deletions
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13
clippy_lints/src/transmute.rs
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@ -80,9 +80,18 @@ declare_lint! {
/// **What it does:** Checks for transmutes from an integer to a `char`.
///
/// **Why is this bad?** Not every integer is a unicode scalar value.
/// **Why is this bad?** Not every integer is a Unicode scalar value.
///
/// **Known problems:** None.
/// **Known problems:**
/// - [`from_u32`] which this lint suggests using is slower than `transmute`
/// as it needs to validate the input.
/// If you are certain that the input is always a valid Unicode scalar value,
/// use [`from_u32_unchecked`] which is as fast as `transmute`
/// but has a semantically meaningful name.
/// - You might want to handle `None` returned from [`from_u32`] instead of calling `unwrap`.
///
/// [`from_u32`]: https://doc.rust-lang.org/std/char/fn.from_u32.html
/// [`from_u32_unchecked`]: https://doc.rust-lang.org/std/char/fn.from_u32_unchecked.html
///
/// **Example:**
/// ```rust