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Auto merge of #10162 - tamaroning:fix10018, r=xFrednet
Fix FP of single-element-loop closes #10018 --- changelog: [`single_element_loop`]: No longer lints, if the loop contains a `break` or `continue` [#10162](https://github.com/rust-lang/rust-clippy/pull/10162) <!-- changelog_checked -->
This commit is contained in:
commit
cf1d3d0370
5 changed files with 94 additions and 1 deletions
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@ -1,6 +1,7 @@
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use super::SINGLE_ELEMENT_LOOP;
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::source::{indent_of, snippet_with_applicability};
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use clippy_utils::visitors::contains_break_or_continue;
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use if_chain::if_chain;
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use rustc_ast::util::parser::PREC_PREFIX;
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use rustc_ast::Mutability;
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@ -67,6 +68,7 @@ pub(super) fn check<'tcx>(
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if_chain! {
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if let ExprKind::Block(block, _) = body.kind;
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if !block.stmts.is_empty();
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if !contains_break_or_continue(body);
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then {
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let mut applicability = Applicability::MachineApplicable;
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let pat_snip = snippet_with_applicability(cx, pat.span, "..", &mut applicability);
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@ -724,3 +724,14 @@ pub fn for_each_local_assignment<'tcx, B>(
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ControlFlow::Continue(())
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}
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}
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pub fn contains_break_or_continue(expr: &Expr<'_>) -> bool {
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for_each_expr(expr, |e| {
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if matches!(e.kind, ExprKind::Break(..) | ExprKind::Continue(..)) {
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ControlFlow::Break(())
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} else {
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ControlFlow::Continue(())
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}
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})
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.is_some()
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}
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@ -33,4 +33,31 @@ fn main() {
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let item = 0..5;
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dbg!(item);
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}
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// should not lint (issue #10018)
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for e in [42] {
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if e > 0 {
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continue;
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}
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}
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// should not lint (issue #10018)
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for e in [42] {
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if e > 0 {
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break;
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}
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}
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// should lint (issue #10018)
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{
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let _ = 42;
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let _f = |n: u32| {
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for i in 0..n {
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if i > 10 {
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dbg!(i);
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break;
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}
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}
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};
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}
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}
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@ -27,4 +27,30 @@ fn main() {
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for item in [0..5].into_iter() {
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dbg!(item);
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}
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// should not lint (issue #10018)
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for e in [42] {
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if e > 0 {
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continue;
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}
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}
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// should not lint (issue #10018)
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for e in [42] {
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if e > 0 {
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break;
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}
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}
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// should lint (issue #10018)
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for _ in [42] {
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let _f = |n: u32| {
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for i in 0..n {
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if i > 10 {
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dbg!(i);
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break;
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}
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}
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};
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}
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}
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@ -95,5 +95,32 @@ LL + dbg!(item);
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LL + }
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error: aborting due to 6 previous errors
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error: for loop over a single element
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--> $DIR/single_element_loop.rs:46:5
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LL | / for _ in [42] {
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LL | | let _f = |n: u32| {
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LL | | for i in 0..n {
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LL | | if i > 10 {
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... |
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LL | | };
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LL | | }
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| |_____^
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help: try
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LL ~ {
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LL + let _ = 42;
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LL + let _f = |n: u32| {
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LL + for i in 0..n {
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LL + if i > 10 {
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LL + dbg!(i);
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LL + break;
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LL + }
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LL + }
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LL + };
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LL + }
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error: aborting due to 7 previous errors
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