rust-clippy/tests/ui-toml/suppress_lint_in_const/test.rs

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#![feature(inline_const)]
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#![warn(clippy::indexing_slicing)]
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// We also check the out_of_bounds_indexing lint here, because it lints similar things and
// we want to avoid false positives.
#![warn(clippy::out_of_bounds_indexing)]
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#![allow(
unconditional_panic,
clippy::no_effect,
clippy::unnecessary_operation,
clippy::useless_vec,
clippy::out_of_bounds_indexing
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)]
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const ARR: [i32; 2] = [1, 2];
const REF: &i32 = &ARR[idx()]; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
const REF_ERR: &i32 = &ARR[idx4()]; // Ok, let rustc handle const contexts.
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//~^ ERROR: failed
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const fn idx() -> usize {
1
}
const fn idx4() -> usize {
4
}
fn main() {
let x = [1, 2, 3, 4];
let index: usize = 1;
x[index];
x[4]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
x[1 << 3]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
x[0]; // Ok, should not produce stderr.
x[3]; // Ok, should not produce stderr.
x[const { idx() }]; // Ok, should not produce stderr.
x[const { idx4() }]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
const { &ARR[idx()] }; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
const { &ARR[idx4()] }; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
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//
//~^^ ERROR: failed
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let y = &x;
y[0]; // Ok, referencing shouldn't affect this lint. See the issue 6021
y[4]; // Ok, rustc will handle references too.
let v = vec![0; 5];
v[0];
v[10];
v[1 << 3];
const N: usize = 15; // Out of bounds
const M: usize = 3; // In bounds
x[N]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
x[M]; // Ok, should not produce stderr.
v[N];
v[M];
}
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/// An opaque integer representation
pub struct Integer<'a> {
/// The underlying data
value: &'a [u8],
}
impl<'a> Integer<'a> {
// Check whether `self` holds a negative number or not
pub const fn is_negative(&self) -> bool {
self.value[0] & 0b1000_0000 != 0
}
}