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Auto merge of #10724 - lukaslueg:largeerrdocs, r=giraffate

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Clarify docs for `RESULT_LARGE_ERR`

Adds a paragraph to address https://github.com/rust-lang/rust-clippy/issues/10211#issuecomment-1521548238

changelog: [`result_large_err`]: Update the document
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bors 2023-05-02 00:41:36 +00:00
commit 824f2e701c
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clippy_lints/src/functions/mod.rs
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@ -252,6 +252,11 @@ declare_clippy_lint! {
/// A `Result` is at least as large as the `Err`-variant. While we
/// expect that variant to be seldomly used, the compiler needs to reserve
/// and move that much memory every single time.
/// Furthermore, errors are often simply passed up the call-stack, making
/// use of the `?`-operator and its type-conversion mechanics. If the
/// `Err`-variant further up the call-stack stores the `Err`-variant in
/// question (as library code often does), it itself needs to be at least
/// as large, propagating the problem.
///
/// ### Known problems
/// The size determined by Clippy is platform-dependent.