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https://github.com/rust-lang/rust-clippy
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FOR_KV_MAP can now lint on mutable maps due to values_mut()
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3a18a48856
commit
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2 changed files with 30 additions and 13 deletions
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@ -16,7 +16,7 @@ use utils::sugg;
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use utils::{snippet, span_lint, get_parent_expr, match_trait_method, match_type, multispan_sugg, in_external_macro,
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is_refutable, span_help_and_lint, is_integer_literal, get_enclosing_block, span_lint_and_then, higher,
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walk_ptrs_ty, last_path_segment};
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last_path_segment};
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use utils::paths;
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/// **What it does:** Checks for looping over the range of `0..len` of some
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@ -712,19 +712,24 @@ fn check_for_loop_over_map_kv<'a, 'tcx>(
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if let PatKind::Tuple(ref pat, _) = pat.node {
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if pat.len() == 2 {
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let (new_pat_span, kind) = match (&pat[0].node, &pat[1].node) {
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(key, _) if pat_is_wild(cx, key, body) => (pat[1].span, "value"),
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(_, value) if pat_is_wild(cx, value, body) => (pat[0].span, "key"),
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let arg_span = arg.span;
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let (new_pat_span, kind, ty, mutbl) = match cx.tcx.tables().expr_ty(arg).sty {
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ty::TyRef(_, ref tam) => match (&pat[0].node, &pat[1].node) {
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(key, _) if pat_is_wild(cx, key, body) => (pat[1].span, "value", tam.ty, tam.mutbl),
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(_, value) if pat_is_wild(cx, value, body) => (pat[0].span, "key", tam.ty, MutImmutable),
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_ => return,
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},
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_ => return,
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};
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let (arg_span, arg) = match arg.node {
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ExprAddrOf(MutImmutable, ref expr) => (arg.span, &**expr),
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ExprAddrOf(MutMutable, _) => return, // for _ in &mut _, there is no {values,keys}_mut method
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_ => (arg.span, arg),
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let mutbl = match mutbl {
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MutImmutable => "",
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MutMutable => "_mut",
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};
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let arg = match arg.node {
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ExprAddrOf(_, ref expr) => &**expr,
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_ => arg,
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};
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let ty = walk_ptrs_ty(cx.tcx.tables().expr_ty(arg));
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if match_type(cx, ty, &paths::HASHMAP) || match_type(cx, ty, &paths::BTREEMAP) {
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span_lint_and_then(cx,
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FOR_KV_MAP,
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@ -735,7 +740,7 @@ fn check_for_loop_over_map_kv<'a, 'tcx>(
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multispan_sugg(db,
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"use the corresponding method".into(),
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&[(pat_span, &snippet(cx, new_pat_span, kind)),
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(arg_span, &format!("{}.{}s()", map.maybe_par(), kind))]);
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(arg_span, &format!("{}.{}s{}()", map.maybe_par(), kind, mutbl))]);
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});
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}
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}
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@ -87,7 +87,7 @@ impl Unrelated {
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}
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}
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#[deny(needless_range_loop, explicit_iter_loop, explicit_into_iter_loop, iter_next_loop, reverse_range_loop, explicit_counter_loop)]
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#[deny(needless_range_loop, explicit_iter_loop, explicit_into_iter_loop, iter_next_loop, reverse_range_loop, explicit_counter_loop, for_kv_map)]
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#[deny(unused_collect)]
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#[allow(linkedlist, shadow_unrelated, unnecessary_mut_passed, cyclomatic_complexity, similar_names)]
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#[allow(many_single_char_names)]
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@ -417,11 +417,23 @@ fn main() {
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let mut m : HashMap<u64, u64> = HashMap::new();
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for (_, v) in &mut m {
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// Ok, there is no values_mut method or equivalent
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//~^ you seem to want to iterate on a map's values
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//~| HELP use the corresponding method
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//~| HELP use the corresponding method
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//~| SUGGESTION for v in m.values_mut()
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let _v = v;
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}
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let m: &mut HashMap<u64, u64> = &mut HashMap::new();
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for (_, v) in &mut *m {
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//~^ you seem to want to iterate on a map's values
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//~| HELP use the corresponding method
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//~| HELP use the corresponding method
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//~| SUGGESTION for v in (*m).values_mut()
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let _v = v;
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}
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let m : HashMap<u64, u64> = HashMap::new();
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let rm = &m;
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for (k, _value) in rm {
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//~^ you seem to want to iterate on a map's keys
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