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Update lint description for new() and default()

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This commit is contained in:
Yechan Bae 2021-10-12 16:01:58 -04:00
parent 03fed75c89
commit 4ed3a4fe2f
1 changed files with 6 additions and 4 deletions
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10
clippy_lints/src/uninit_vec.rs
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@ -13,14 +13,16 @@ use rustc_span::{sym, Span};
declare_clippy_lint! {
/// ### What it does
/// Checks for `set_len()` call that creates `Vec` with uninitialized elements.
/// This is commonly caused by calling `set_len()` right after after calling
/// `with_capacity()` or `reserve()`.
/// This is commonly caused by calling `set_len()` right after allocating or
/// reserving a buffer with `new()`, `default()`, `with_capacity()`, or `reserve()`.
///
/// ### Why is this bad?
/// It creates a `Vec` with uninitialized data, which leads to
/// undefined behavior with most safe operations.
/// undefined behavior with most safe operations. Notably, uninitialized
/// `Vec<u8>` must not be used with generic `Read`.
///
/// Notably, uninitialized `Vec<u8>` must not be used with generic `Read`.
/// Moreover, calling `set_len()` on a `Vec` created with `new()` or `default()`
/// creates out-of-bound values that lead to heap memory corruption when used.
///
/// ### Known Problems
/// This lint only checks directly adjacent statements.