mirror of
https://github.com/rust-lang/rust-clippy
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4ec439bef0
This commit contains a few changes. In an attempt to clarify which test cases should and should not produce stderr it became clear that some cases were being handled incorrectly. In order to address these test cases, a minor re-factor was made to the linting logic itself. The re-factor was driven by edge case handling including a need for additional match conditions for `ExprCall` (`&x[0..=4]`) and `ExprBinary` (`x[1 << 3]`). Rather than attempt to account for each potential `Expr*` the code was re-factored into simply "if ranged index" and an "otherwise" conditions.
71 lines
1.9 KiB
Rust
71 lines
1.9 KiB
Rust
#![feature(plugin)]
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#![warn(indexing_slicing)]
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#![warn(out_of_bounds_indexing)]
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#![allow(no_effect, unnecessary_operation)]
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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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let index_from: usize = 2;
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let index_to: usize = 3;
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x[index];
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&x[index..];
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&x[..index];
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&x[index_from..index_to];
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&x[index_from..][..index_to]; // Two lint reports, one for [index_from..] and another for [..index_to].
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x[4];
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x[1 << 3];
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&x[..=4];
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&x[1..5];
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&x[5..][..10]; // Two lint reports, one for [5..] and another for [..10].
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&x[5..];
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&x[..5];
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&x[5..].iter().map(|x| 2 * x).collect::<Vec<i32>>();
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&x[0..=4];
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&x[0..][..3];
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&x[1..][..5];
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&x[4..]; // Ok, should not produce stderr.
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&x[..4]; // Ok, should not produce stderr.
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&x[..]; // Ok, should not produce stderr.
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&x[1..]; // Ok, should not produce stderr.
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&x[2..].iter().map(|x| 2 * x).collect::<Vec<i32>>(); // Ok, should not produce stderr.
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&x[0..].get(..3); // Ok, should not produce stderr.
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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[0..3]; // Ok, should not produce stderr.
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let y = &x;
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y[0];
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&y[1..2];
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&y[0..=4];
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&y[..=4];
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&y[..]; // Ok, should not produce stderr.
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let empty: [i8; 0] = [];
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empty[0];
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&empty[1..5];
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&empty[0..=4];
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&empty[..=4];
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&empty[1..];
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&empty[..4];
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&empty[0..=0];
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&empty[..=0];
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&empty[0..]; // Ok, should not produce stderr.
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&empty[0..0]; // Ok, should not produce stderr.
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&empty[..0]; // Ok, should not produce stderr.
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&empty[..]; // Ok, should not produce stderr.
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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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&v[10..100];
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&x[10..][..100]; // Two lint reports, one for [10..] and another for [..100].
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&v[10..];
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&v[..100];
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&v[..]; // Ok, should not produce stderr.
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}
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