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minmax: use let chain

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This commit is contained in:
Jason Newcomb 2024-06-13 18:46:45 -04:00
parent 488a545a50
commit eda45aaba1
1 changed files with 16 additions and 21 deletions
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37
clippy_lints/src/minmax.rs
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@ -5,7 +5,7 @@
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
use rustc_span::sym;
use std::cmp::Ordering;
use std::cmp::Ordering::{Equal, Greater, Less};
declare_clippy_lint! {
/// ### What it does
@ -36,26 +36,21 @@
impl<'tcx> LateLintPass<'tcx> for MinMaxPass {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
if let Some((outer_max, outer_c, oe)) = min_max(cx, expr) {
if let Some((inner_max, inner_c, ie)) = min_max(cx, oe) {
if outer_max == inner_max {
return;
}
match (
outer_max,
Constant::partial_cmp(cx.tcx, cx.typeck_results().expr_ty(ie), &outer_c, &inner_c),
) {
(_, None) | (MinMax::Max, Some(Ordering::Less)) | (MinMax::Min, Some(Ordering::Greater)) => (),
_ => {
span_lint(
cx,
MIN_MAX,
expr.span,
"this `min`/`max` combination leads to constant result",
);
},
}
}
if let Some((outer_max, outer_c, oe)) = min_max(cx, expr)
&& let Some((inner_max, inner_c, ie)) = min_max(cx, oe)
&& outer_max != inner_max
&& let Some(ord) = Constant::partial_cmp(cx.tcx, cx.typeck_results().expr_ty(ie), &outer_c, &inner_c)
&& matches!(
(outer_max, ord),
(MinMax::Max, Equal | Greater) | (MinMax::Min, Equal | Less)
)
{
span_lint(
cx,
MIN_MAX,
expr.span,
"this `min`/`max` combination leads to constant result",
);
}
}
}