Added lints `into_iter_on_ref` and `into_iter_on_array`. Fix #1565.
This commit is contained in:
kennytm
parent
a8d258454f
commit
2d1c9313b0
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@ -713,6 +713,8 @@ All notable changes to this project will be documented in this file.
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[`inline_fn_without_body`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#inline_fn_without_body
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[`int_plus_one`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#int_plus_one
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[`integer_arithmetic`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#integer_arithmetic
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[`into_iter_on_array`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#into_iter_on_array
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[`into_iter_on_ref`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#into_iter_on_ref
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[`invalid_ref`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#invalid_ref
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[`invalid_regex`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#invalid_regex
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[`invalid_upcast_comparisons`]: https://rust-lang-nursery.github.io/rust-clippy/master/index.html#invalid_upcast_comparisons
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@ -9,7 +9,7 @@ We are currently in the process of discussing Clippy 1.0 via the RFC process in
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A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
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[There are 284 lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)
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[There are 286 lints included in this crate!](https://rust-lang-nursery.github.io/rust-clippy/master/index.html)
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We have a bunch of lint categories to allow you to choose how much Clippy is supposed to ~~annoy~~ help you:
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@ -628,6 +628,8 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
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methods::EXPECT_FUN_CALL,
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methods::FILTER_NEXT,
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methods::GET_UNWRAP,
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methods::INTO_ITER_ON_ARRAY,
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methods::INTO_ITER_ON_REF,
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methods::ITER_CLONED_COLLECT,
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methods::ITER_NTH,
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methods::ITER_SKIP_NEXT,
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@ -784,6 +786,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
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mem_replace::MEM_REPLACE_OPTION_WITH_NONE,
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methods::CHARS_LAST_CMP,
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methods::GET_UNWRAP,
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methods::INTO_ITER_ON_REF,
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methods::ITER_CLONED_COLLECT,
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methods::ITER_SKIP_NEXT,
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methods::NEW_RET_NO_SELF,
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@ -935,6 +938,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
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loops::WHILE_IMMUTABLE_CONDITION,
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mem_discriminant::MEM_DISCRIMINANT_NON_ENUM,
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methods::CLONE_DOUBLE_REF,
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methods::INTO_ITER_ON_ARRAY,
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methods::TEMPORARY_CSTRING_AS_PTR,
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minmax::MIN_MAX,
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misc::CMP_NAN,
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@ -745,6 +745,51 @@ declare_clippy_lint! {
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"using `filter_map` when a more succinct alternative exists"
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}
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/// **What it does:** Checks for `into_iter` calls on types which should be replaced by `iter` or
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/// `iter_mut`.
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///
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/// **Why is this bad?** Arrays and `PathBuf` do not yet have an `into_iter` method which move out
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/// their content into an iterator. Calling `into_iter` instead just forwards to `iter` or
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/// `iter_mut` due to auto-referencing, of which only yield references. Furthermore, when the
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/// standard library actually [implements the `into_iter` method][25725] which moves the content out
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/// of the array, the original use of `into_iter` got inferred with the wrong type and the code will
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/// be broken.
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///
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/// **Known problems:** None
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///
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/// **Example:**
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///
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/// ```rust
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/// let _ = [1, 2, 3].into_iter().map(|x| *x).collect::<Vec<u32>>();
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/// ```
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///
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/// [25725]: https://github.com/rust-lang/rust/issues/25725
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declare_clippy_lint! {
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pub INTO_ITER_ON_ARRAY,
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correctness,
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"using `.into_iter()` on an array"
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}
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/// **What it does:** Checks for `into_iter` calls on references which should be replaced by `iter`
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/// or `iter_mut`.
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///
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/// **Why is this bad?** Readability. Calling `into_iter` on a reference will not move out its
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/// content into the resulting iterator, which is confusing. It is better just call `iter` or
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/// `iter_mut` directly.
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///
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/// **Known problems:** None
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///
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/// **Example:**
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///
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/// ```rust
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/// let _ = (&vec![3, 4, 5]).into_iter();
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/// ```
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declare_clippy_lint! {
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pub INTO_ITER_ON_REF,
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style,
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"using `.into_iter()` on a reference"
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}
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impl LintPass for Pass {
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fn get_lints(&self) -> LintArray {
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lint_array!(
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@ -779,7 +824,9 @@ impl LintPass for Pass {
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ITER_CLONED_COLLECT,
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USELESS_ASREF,
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UNNECESSARY_FOLD,
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UNNECESSARY_FILTER_MAP
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UNNECESSARY_FILTER_MAP,
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INTO_ITER_ON_ARRAY,
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INTO_ITER_ON_REF,
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)
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}
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}
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@ -843,6 +890,9 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
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lint_single_char_pattern(cx, expr, &args[pos]);
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}
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},
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ty::Ref(..) if method_call.ident.name == "into_iter" => {
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lint_into_iter(cx, expr, self_ty, *method_span);
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},
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_ => (),
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}
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},
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@ -2084,6 +2134,71 @@ fn lint_asref(cx: &LateContext<'_, '_>, expr: &hir::Expr, call_name: &str, as_re
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}
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}
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fn ty_has_iter_method(cx: &LateContext<'_, '_>, self_ref_ty: ty::Ty<'_>) -> Option<(&'static Lint, &'static str, &'static str)> {
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let (self_ty, mutbl) = match self_ref_ty.sty {
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ty::TyKind::Ref(_, self_ty, mutbl) => (self_ty, mutbl),
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_ => unreachable!(),
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};
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let method_name = match mutbl {
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hir::MutImmutable => "iter",
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hir::MutMutable => "iter_mut",
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};
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let def_id = match self_ty.sty {
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ty::TyKind::Array(..) => return Some((INTO_ITER_ON_ARRAY, "array", method_name)),
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ty::TyKind::Slice(..) => return Some((INTO_ITER_ON_REF, "slice", method_name)),
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ty::Adt(adt, _) => adt.did,
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_ => return None,
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};
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// FIXME: instead of this hard-coded list, we should check if `<adt>::iter`
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// exists and has the desired signature. Unfortunately FnCtxt is not exported
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// so we can't use its `lookup_method` method.
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static INTO_ITER_COLLECTIONS: [(&Lint, &[&str]); 13] = [
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(INTO_ITER_ON_REF, &paths::VEC),
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(INTO_ITER_ON_REF, &paths::OPTION),
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(INTO_ITER_ON_REF, &paths::RESULT),
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(INTO_ITER_ON_REF, &paths::BTREESET),
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(INTO_ITER_ON_REF, &paths::BTREEMAP),
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(INTO_ITER_ON_REF, &paths::VEC_DEQUE),
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(INTO_ITER_ON_REF, &paths::LINKED_LIST),
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(INTO_ITER_ON_REF, &paths::BINARY_HEAP),
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(INTO_ITER_ON_REF, &paths::HASHSET),
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(INTO_ITER_ON_REF, &paths::HASHMAP),
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(INTO_ITER_ON_ARRAY, &["std", "path", "PathBuf"]),
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(INTO_ITER_ON_REF, &["std", "path", "Path"]),
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(INTO_ITER_ON_REF, &["std", "sync", "mpsc", "Receiver"]),
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];
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for (lint, path) in &INTO_ITER_COLLECTIONS {
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if match_def_path(cx.tcx, def_id, path) {
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return Some((lint, path.last().unwrap(), method_name))
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}
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}
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None
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}
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fn lint_into_iter(cx: &LateContext<'_, '_>, expr: &hir::Expr, self_ref_ty: ty::Ty<'_>, method_span: Span) {
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if !match_trait_method(cx, expr, &paths::INTO_ITERATOR) {
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return;
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}
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if let Some((lint, kind, method_name)) = ty_has_iter_method(cx, self_ref_ty) {
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span_lint_and_sugg(
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cx,
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lint,
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method_span,
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&format!(
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"this .into_iter() call is equivalent to .{}() and will not move the {}",
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method_name,
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kind,
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),
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"call directly",
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method_name.to_owned(),
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);
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}
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}
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/// Given a `Result<T, E>` type, return its error type (`E`).
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fn get_error_type<'a>(cx: &LateContext<'_, '_>, ty: Ty<'a>) -> Option<Ty<'a>> {
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if let ty::Adt(_, substs) = ty.sty {
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@ -29,7 +29,7 @@ impl Unrelated {
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clippy::for_kv_map)]
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#[warn(clippy::unused_collect)]
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#[allow(clippy::linkedlist, clippy::shadow_unrelated, clippy::unnecessary_mut_passed, clippy::cyclomatic_complexity, clippy::similar_names)]
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#[allow(clippy::many_single_char_names, unused_variables)]
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#[allow(clippy::many_single_char_names, unused_variables, clippy::into_iter_on_array)]
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fn main() {
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const MAX_LEN: usize = 42;
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@ -0,0 +1,44 @@
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#![warn(clippy::into_iter_on_ref)]
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#![deny(clippy::into_iter_on_array)]
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struct X;
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use std::collections::*;
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fn main() {
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for _ in &[1,2,3] {}
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for _ in vec![X, X] {}
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for _ in &vec![X, X] {}
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for _ in [1,2,3].into_iter() {} //~ ERROR equivalent to .iter()
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let _ = [1,2,3].into_iter(); //~ ERROR equivalent to .iter()
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let _ = vec![1,2,3].into_iter();
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let _ = (&vec![1,2,3]).into_iter(); //~ WARN equivalent to .iter()
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let _ = vec![1,2,3].into_boxed_slice().into_iter(); //~ WARN equivalent to .iter()
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let _ = std::rc::Rc::from(&[X][..]).into_iter(); //~ WARN equivalent to .iter()
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let _ = std::sync::Arc::from(&[X][..]).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&&&&&&&[1,2,3]).into_iter(); //~ ERROR equivalent to .iter()
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let _ = (&&&&mut &&&[1,2,3]).into_iter(); //~ ERROR equivalent to .iter()
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let _ = (&mut &mut &mut [1,2,3]).into_iter(); //~ ERROR equivalent to .iter_mut()
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let _ = (&Some(4)).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut Some(5)).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&Ok::<_, i32>(6)).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut Err::<i32, _>(7)).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&Vec::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut Vec::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&BTreeMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut BTreeMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&VecDeque::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut VecDeque::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&LinkedList::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut LinkedList::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&HashMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&mut HashMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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let _ = (&BTreeSet::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&BinaryHeap::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = (&HashSet::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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let _ = std::path::Path::new("12/34").into_iter(); //~ WARN equivalent to .iter()
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let _ = std::path::PathBuf::from("12/34").into_iter(); //~ ERROR equivalent to .iter()
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}
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@ -0,0 +1,178 @@
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error: this .into_iter() call is equivalent to .iter() and will not move the array
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--> $DIR/into_iter_on_ref.rs:11:22
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11 | for _ in [1,2,3].into_iter() {} //~ ERROR equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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note: lint level defined here
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--> $DIR/into_iter_on_ref.rs:2:9
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2 | #![deny(clippy::into_iter_on_array)]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: this .into_iter() call is equivalent to .iter() and will not move the array
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--> $DIR/into_iter_on_ref.rs:13:21
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13 | let _ = [1,2,3].into_iter(); //~ ERROR equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter() and will not move the Vec
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--> $DIR/into_iter_on_ref.rs:15:28
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15 | let _ = (&vec![1,2,3]).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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= note: `-D clippy::into-iter-on-ref` implied by `-D warnings`
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error: this .into_iter() call is equivalent to .iter() and will not move the slice
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--> $DIR/into_iter_on_ref.rs:16:44
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16 | let _ = vec![1,2,3].into_boxed_slice().into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter() and will not move the slice
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--> $DIR/into_iter_on_ref.rs:17:41
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17 | let _ = std::rc::Rc::from(&[X][..]).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter() and will not move the slice
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--> $DIR/into_iter_on_ref.rs:18:44
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18 | let _ = std::sync::Arc::from(&[X][..]).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter() and will not move the array
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--> $DIR/into_iter_on_ref.rs:20:30
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20 | let _ = (&&&&&&&[1,2,3]).into_iter(); //~ ERROR equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter() and will not move the array
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--> $DIR/into_iter_on_ref.rs:21:34
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21 | let _ = (&&&&mut &&&[1,2,3]).into_iter(); //~ ERROR equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter_mut() and will not move the array
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--> $DIR/into_iter_on_ref.rs:22:38
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22 | let _ = (&mut &mut &mut [1,2,3]).into_iter(); //~ ERROR equivalent to .iter_mut()
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| ^^^^^^^^^ help: call directly: `iter_mut`
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error: this .into_iter() call is equivalent to .iter() and will not move the Option
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--> $DIR/into_iter_on_ref.rs:24:24
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24 | let _ = (&Some(4)).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter_mut() and will not move the Option
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--> $DIR/into_iter_on_ref.rs:25:28
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25 | let _ = (&mut Some(5)).into_iter(); //~ WARN equivalent to .iter_mut()
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| ^^^^^^^^^ help: call directly: `iter_mut`
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error: this .into_iter() call is equivalent to .iter() and will not move the Result
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--> $DIR/into_iter_on_ref.rs:26:32
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26 | let _ = (&Ok::<_, i32>(6)).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter_mut() and will not move the Result
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--> $DIR/into_iter_on_ref.rs:27:37
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27 | let _ = (&mut Err::<i32, _>(7)).into_iter(); //~ WARN equivalent to .iter_mut()
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| ^^^^^^^^^ help: call directly: `iter_mut`
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error: this .into_iter() call is equivalent to .iter() and will not move the Vec
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--> $DIR/into_iter_on_ref.rs:28:34
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|
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28 | let _ = (&Vec::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter_mut() and will not move the Vec
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--> $DIR/into_iter_on_ref.rs:29:38
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29 | let _ = (&mut Vec::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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| ^^^^^^^^^ help: call directly: `iter_mut`
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error: this .into_iter() call is equivalent to .iter() and will not move the BTreeMap
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--> $DIR/into_iter_on_ref.rs:30:44
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|
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30 | let _ = (&BTreeMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter()
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| ^^^^^^^^^ help: call directly: `iter`
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error: this .into_iter() call is equivalent to .iter_mut() and will not move the BTreeMap
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--> $DIR/into_iter_on_ref.rs:31:48
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31 | let _ = (&mut BTreeMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
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| ^^^^^^^^^ help: call directly: `iter_mut`
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error: this .into_iter() call is equivalent to .iter() and will not move the VecDeque
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--> $DIR/into_iter_on_ref.rs:32:39
|
||||
|
|
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32 | let _ = (&VecDeque::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter_mut() and will not move the VecDeque
|
||||
--> $DIR/into_iter_on_ref.rs:33:43
|
||||
|
|
||||
33 | let _ = (&mut VecDeque::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
|
||||
| ^^^^^^^^^ help: call directly: `iter_mut`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the LinkedList
|
||||
--> $DIR/into_iter_on_ref.rs:34:41
|
||||
|
|
||||
34 | let _ = (&LinkedList::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter_mut() and will not move the LinkedList
|
||||
--> $DIR/into_iter_on_ref.rs:35:45
|
||||
|
|
||||
35 | let _ = (&mut LinkedList::<i32>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
|
||||
| ^^^^^^^^^ help: call directly: `iter_mut`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the HashMap
|
||||
--> $DIR/into_iter_on_ref.rs:36:43
|
||||
|
|
||||
36 | let _ = (&HashMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter_mut() and will not move the HashMap
|
||||
--> $DIR/into_iter_on_ref.rs:37:47
|
||||
|
|
||||
37 | let _ = (&mut HashMap::<i32, u64>::new()).into_iter(); //~ WARN equivalent to .iter_mut()
|
||||
| ^^^^^^^^^ help: call directly: `iter_mut`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the BTreeSet
|
||||
--> $DIR/into_iter_on_ref.rs:39:39
|
||||
|
|
||||
39 | let _ = (&BTreeSet::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the BinaryHeap
|
||||
--> $DIR/into_iter_on_ref.rs:40:41
|
||||
|
|
||||
40 | let _ = (&BinaryHeap::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the HashSet
|
||||
--> $DIR/into_iter_on_ref.rs:41:38
|
||||
|
|
||||
41 | let _ = (&HashSet::<i32>::new()).into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the Path
|
||||
--> $DIR/into_iter_on_ref.rs:42:43
|
||||
|
|
||||
42 | let _ = std::path::Path::new("12/34").into_iter(); //~ WARN equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: this .into_iter() call is equivalent to .iter() and will not move the PathBuf
|
||||
--> $DIR/into_iter_on_ref.rs:43:47
|
||||
|
|
||||
43 | let _ = std::path::PathBuf::from("12/34").into_iter(); //~ ERROR equivalent to .iter()
|
||||
| ^^^^^^^^^ help: call directly: `iter`
|
||||
|
||||
error: aborting due to 28 previous errors
|
||||
|
||||
Loading…
Reference in New Issue