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https://github.com/rust-lang/rust-clippy
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Fix ICE in loops
module
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parent
2d4c3379d3
commit
888657e09a
6 changed files with 30 additions and 15 deletions
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@ -2374,7 +2374,7 @@ fn check_needless_collect_direct_usage<'tcx>(expr: &'tcx Expr<'_>, cx: &LateCont
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match_type(cx, ty, &paths::BTREEMAP) ||
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is_type_diagnostic_item(cx, ty, sym!(hashmap_type)) {
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if method.ident.name == sym!(len) {
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let span = shorten_span(expr, sym!(collect));
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let span = shorten_needless_collect_span(expr);
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span_lint_and_sugg(
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cx,
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NEEDLESS_COLLECT,
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@ -2386,20 +2386,20 @@ fn check_needless_collect_direct_usage<'tcx>(expr: &'tcx Expr<'_>, cx: &LateCont
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);
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}
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if method.ident.name == sym!(is_empty) {
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let span = shorten_span(expr, sym!(iter));
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let span = shorten_needless_collect_span(expr);
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span_lint_and_sugg(
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cx,
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NEEDLESS_COLLECT,
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span,
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NEEDLESS_COLLECT_MSG,
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"replace with",
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"get(0).is_none()".to_string(),
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"next().is_none()".to_string(),
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Applicability::MachineApplicable,
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);
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}
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if method.ident.name == sym!(contains) {
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let contains_arg = snippet(cx, args[1].span, "??");
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let span = shorten_span(expr, sym!(collect));
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let span = shorten_needless_collect_span(expr);
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span_lint_and_then(
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cx,
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NEEDLESS_COLLECT,
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@ -2579,13 +2579,13 @@ fn detect_iter_and_into_iters<'tcx>(block: &'tcx Block<'tcx>, identifier: Ident)
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}
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}
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fn shorten_span(expr: &Expr<'_>, target_fn_name: Symbol) -> Span {
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let mut current_expr = expr;
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while let ExprKind::MethodCall(ref path, ref span, ref args, _) = current_expr.kind {
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if path.ident.name == target_fn_name {
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fn shorten_needless_collect_span(expr: &Expr<'_>) -> Span {
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if_chain! {
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if let ExprKind::MethodCall(.., args, _) = &expr.kind;
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if let ExprKind::MethodCall(_, span, ..) = &args[0].kind;
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then {
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return expr.span.with_lo(span.lo());
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}
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current_expr = &args[0];
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}
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unreachable!()
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unreachable!();
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}
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5
tests/ui/crashes/ice-5872.rs
Normal file
5
tests/ui/crashes/ice-5872.rs
Normal file
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@ -0,0 +1,5 @@
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#![warn(clippy::needless_collect)]
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fn main() {
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let _ = vec![1, 2, 3].into_iter().collect::<Vec<_>>().is_empty();
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}
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10
tests/ui/crashes/ice-5872.stderr
Normal file
10
tests/ui/crashes/ice-5872.stderr
Normal file
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@ -0,0 +1,10 @@
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error: avoid using `collect()` when not needed
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--> $DIR/ice-5872.rs:4:39
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LL | let _ = vec![1, 2, 3].into_iter().collect::<Vec<_>>().is_empty();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `next().is_none()`
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= note: `-D clippy::needless-collect` implied by `-D warnings`
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error: aborting due to previous error
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@ -5,11 +5,11 @@
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use std::collections::{BTreeSet, HashMap, HashSet};
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#[warn(clippy::needless_collect)]
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#[allow(unused_variables, clippy::iter_cloned_collect)]
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#[allow(unused_variables, clippy::iter_cloned_collect, clippy::iter_next_slice)]
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fn main() {
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let sample = [1; 5];
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let len = sample.iter().count();
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if sample.get(0).is_none() {
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if sample.iter().next().is_none() {
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// Empty
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}
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sample.iter().cloned().any(|x| x == 1);
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@ -5,7 +5,7 @@
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use std::collections::{BTreeSet, HashMap, HashSet};
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#[warn(clippy::needless_collect)]
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#[allow(unused_variables, clippy::iter_cloned_collect)]
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#[allow(unused_variables, clippy::iter_cloned_collect, clippy::iter_next_slice)]
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fn main() {
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let sample = [1; 5];
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let len = sample.iter().collect::<Vec<_>>().len();
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@ -7,10 +7,10 @@ LL | let len = sample.iter().collect::<Vec<_>>().len();
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= note: `-D clippy::needless-collect` implied by `-D warnings`
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error: avoid using `collect()` when not needed
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--> $DIR/needless_collect.rs:12:15
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--> $DIR/needless_collect.rs:12:22
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LL | if sample.iter().collect::<Vec<_>>().is_empty() {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `get(0).is_none()`
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `next().is_none()`
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error: avoid using `collect()` when not needed
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--> $DIR/needless_collect.rs:15:28
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