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