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fix for_loop_over_fallibles lint docs

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Maybe Waffle 2022-08-18 11:43:10 +04:00
parent 6766113c87
commit 98e0c4df73
1 changed files with 10 additions and 22 deletions
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32
compiler/rustc_lint/src/for_loop_over_fallibles.rs
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@ -10,7 +10,16 @@ use rustc_span::{sym, Span};
use rustc_trait_selection::traits::TraitEngineExt;
declare_lint! {
/// Checks for `for` loops over `Option` or `Result` values.
/// The `for_loop_over_fallibles` lint checks for `for` loops over `Option` or `Result` values.
///
/// ### Example
///
/// ```rust
/// let opt = Some(1);
/// for x in opt { /* ... */}
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
@ -25,27 +34,6 @@ declare_lint! {
/// The "intended" use of `IntoIterator` implementations for `Option` and `Result` is passing them to
/// generic code that expects something implementing `IntoIterator`. For example using `.chain(option)`
/// to optionally add a value to an iterator.
///
/// ### Example
///
/// ```rust
/// # let opt = Some(1);
/// # let res: Result<i32, std::io::Error> = Ok(1);
/// # let recv = || None::<i32>;
/// for x in opt { /* ... */}
/// for x in res { /* ... */ }
/// for x in recv() { /* ... */ }
/// ```
///
/// Use instead:
/// ```rust
/// # let opt = Some(1);
/// # let res: Result<i32, std::io::Error> = Ok(1);
/// # let recv = || None::<i32>;
/// if let Some(x) = opt { /* ... */}
/// if let Ok(x) = res { /* ... */ }
/// while let Some(x) = recv() { /* ... */ }
/// ```
pub FOR_LOOP_OVER_FALLIBLES,
Warn,
"for-looping over an `Option` or a `Result`, which is more clearly expressed as an `if let`"