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`must_use_unit` lints unit-returning functions with a `#[must_use]` attribute, suggesting to remove it. `double_must_use` lints functions with a plain `#[must_use]` attribute, but which return a type which is already `#[must_use]`, so the attribute has no benefit. `must_use_candidate` is a pedantic lint that lints functions and methods that return some non-unit type that is not already `#[must_use]` and suggests to add the annotation.
54 lines
898 B
Rust
54 lines
898 B
Rust
#![warn(
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clippy::all,
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clippy::pedantic,
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clippy::shadow_same,
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clippy::shadow_reuse,
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clippy::shadow_unrelated
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)]
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#![allow(
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unused_parens,
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unused_variables,
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clippy::missing_docs_in_private_items,
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clippy::single_match
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)]
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fn id<T>(x: T) -> T {
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x
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}
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#[must_use]
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fn first(x: (isize, isize)) -> isize {
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x.0
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}
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fn main() {
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let mut x = 1;
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let x = &mut x;
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let x = { x };
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let x = (&*x);
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let x = { *x + 1 };
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let x = id(x);
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let x = (1, x);
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let x = first(x);
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let y = 1;
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let x = y;
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let x;
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x = 42;
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let o = Some(1_u8);
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if let Some(p) = o {
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assert_eq!(1, p);
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}
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match o {
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Some(p) => p, // no error, because the p above is in its own scope
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None => 0,
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};
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match (x, o) {
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(1, Some(a)) | (a, Some(1)) => (), // no error though `a` appears twice
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_ => (),
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}
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}
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