Fixed ICE introduced in #12004
Issue: in #12004, we emit a lint for `filter(Option::is_some)`. If the parent expression is a `.map` we don't emit that lint as there exists a more specialized lint for that. The ICE introduced in #12004 is a consequence of the assumption that a parent expression after a filter would be a method call with the filter call being the receiver. However, it is entirely possible to have a closure of the form ``` || { vec![Some(1), None].into_iter().filter(Option::is_some) } ``` The previous implementation looked at the parent expression; namely the closure, and tried to check the parameters by indexing [0] on an empty list. This commit is an overhaul of the lint with significantly more FP tests and checks. Impl details: 1. We verify that the filter method we are in is a proper trait method to avoid FPs. 2. We check that the parent expression is not a map by checking whether it exists; if is a trait method; and then a method call. 3. We check that we don't have comments in the span. 4. We verify that we are in an Iterator of Option and Result. 5. We check the contents of the filter. 1. For closures we peel it. If it is not a single expression, we don't lint. 2. For paths, we do a typecheck to avoid FPs for types that impl functions with the same names. 3. For calls, we verify the type, via the path, and that the param of the closure is the single argument to the call. 4. For method calls we verify that the receiver is the parameter of the closure. Since we handle single, non-block exprs, the parameter can't be shadowed, so no FP. This commit also adds additional FP tests.
This commit is contained in:
Quinn Sinclair
parent
9eb2b225f8
commit
bbadce9ec0
@ -26,13 +26,14 @@ fn is_method(cx: &LateContext<'_>, expr: &hir::Expr<'_>, method_name: Symbol) ->
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hir::ExprKind::Closure(&hir::Closure { body, .. }) => {
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let body = cx.tcx.hir().body(body);
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let closure_expr = peel_blocks(body.value);
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let arg_id = body.params[0].pat.hir_id;
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match closure_expr.kind {
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hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, receiver, ..) => {
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if ident.name == method_name
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&& let hir::ExprKind::Path(path) = &receiver.kind
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&& let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id)
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&& !body.params.is_empty()
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{
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let arg_id = body.params[0].pat.hir_id;
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return arg_id == *local;
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}
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false
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@ -1,80 +1,181 @@
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use clippy_utils::ty::get_iterator_item_ty;
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use hir::ExprKind;
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use rustc_lint::{LateContext, LintContext};
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use super::{ITER_FILTER_IS_OK, ITER_FILTER_IS_SOME};
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use clippy_utils::diagnostics::span_lint_and_sugg;
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use clippy_utils::source::{indent_of, reindent_multiline};
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use clippy_utils::{is_trait_method, peel_blocks, span_contains_comment};
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use clippy_utils::{get_parent_expr, is_trait_method, peel_blocks, span_contains_comment};
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use rustc_errors::Applicability;
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use rustc_hir as hir;
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use rustc_hir::def::Res;
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use rustc_hir::QPath;
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use rustc_span::symbol::{sym, Symbol};
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use rustc_span::symbol::{sym, Ident, Symbol};
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use rustc_span::Span;
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use std::borrow::Cow;
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fn is_method(cx: &LateContext<'_>, expr: &hir::Expr<'_>, method_name: Symbol) -> bool {
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match &expr.kind {
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hir::ExprKind::Path(QPath::TypeRelative(_, mname)) => mname.ident.name == method_name,
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hir::ExprKind::Path(QPath::Resolved(_, segments)) => {
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segments.segments.last().unwrap().ident.name == method_name
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///
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/// Returns true if the expression is a method call to `method_name`
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/// e.g. `a.method_name()` or `Option::method_name`.
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///
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/// The type-checker verifies for us that the method accepts the right kind of items
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/// (e.g. `Option::is_some` accepts `Option<_>`), so we don't need to check that.
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///
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/// How to capture each case:
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///
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/// `.filter(|a| { std::option::Option::is_some(a) })`
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/// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <- this is a closure, getting unwrapped and
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/// recursively checked.
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/// `std::option::Option::is_some(a)`
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/// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <- this is a call. It unwraps to a path with
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/// `QPath::TypeRelative`. Since this is a type relative path, we need to check the method name, the
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/// type, and that the parameter of the closure is passed in the call. This part is the dual of
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/// `receiver.method_name()` below.
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///
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/// `filter(std::option::Option::is_some);`
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/// ^^^^^^^^^^^^^^^^^^^^^^^^^^^ <- this is a type relative path, like above, we check the
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/// type and the method name.
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///
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/// `filter(|a| a.is_some());`
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/// ^^^^^^^^^^^^^^^ <- this is a method call inside a closure,
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/// we check that the parameter of the closure is the receiver of the method call and don't allow
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/// any other parameters.
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fn is_method(
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cx: &LateContext<'_>,
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expr: &hir::Expr<'_>,
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type_symbol: Symbol,
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method_name: Symbol,
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params: &[&hir::Pat<'_>],
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) -> bool {
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fn pat_is_recv(ident: Ident, param: &hir::Pat<'_>) -> bool {
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match param.kind {
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hir::PatKind::Binding(_, _, other, _) => ident == other,
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hir::PatKind::Ref(pat, _) => pat_is_recv(ident, pat),
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_ => false,
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}
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}
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match expr.kind {
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hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, recv, ..) => {
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// compare the identifier of the receiver to the parameter
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// we are in a filter => closure has a single parameter and a single, non-block
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// expression, this means that the parameter shadows all outside variables with
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// the same name => avoid FPs. If the parameter is not the receiver, then this hits
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// outside variables => avoid FP
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if ident.name == method_name
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&& let ExprKind::Path(QPath::Resolved(None, path)) = recv.kind
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&& let &[seg] = path.segments
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&& params.iter().any(|p| pat_is_recv(seg.ident, p))
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{
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return true;
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}
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false
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},
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// This is used to check for complete paths via `|a| std::option::Option::is_some(a)`
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// this then unwraps to a path with `QPath::TypeRelative`
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// we pass the params as they've been passed to the current call through the closure
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hir::ExprKind::Call(expr, [param]) => {
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// this will hit the `QPath::TypeRelative` case and check that the method name is correct
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if is_method(cx, expr, type_symbol, method_name, params)
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// we then check that this is indeed passing the parameter of the closure
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&& let ExprKind::Path(QPath::Resolved(None, path)) = param.kind
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&& let &[seg] = path.segments
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&& params.iter().any(|p| pat_is_recv(seg.ident, p))
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{
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return true;
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}
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false
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},
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hir::ExprKind::Path(QPath::TypeRelative(ty, mname)) => {
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let ty = cx.typeck_results().node_type(ty.hir_id);
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if let Some(did) = cx.tcx.get_diagnostic_item(type_symbol)
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&& ty.ty_adt_def() == cx.tcx.type_of(did).skip_binder().ty_adt_def()
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{
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return mname.ident.name == method_name;
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}
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false
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},
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hir::ExprKind::MethodCall(segment, _, _, _) => segment.ident.name == method_name,
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hir::ExprKind::Closure(&hir::Closure { body, .. }) => {
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let body = cx.tcx.hir().body(body);
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let closure_expr = peel_blocks(body.value);
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let arg_id = body.params[0].pat.hir_id;
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match closure_expr.kind {
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hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, receiver, ..) => {
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if ident.name == method_name
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&& let hir::ExprKind::Path(path) = &receiver.kind
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&& let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id)
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{
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return arg_id == *local;
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}
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false
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},
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_ => false,
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}
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let params = body.params.iter().map(|param| param.pat).collect::<Vec<_>>();
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is_method(cx, closure_expr, type_symbol, method_name, params.as_slice())
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},
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_ => false,
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}
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}
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fn parent_is_map(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
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if let hir::Node::Expr(parent_expr) = cx.tcx.hir().get_parent(expr.hir_id) {
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is_method(cx, parent_expr, rustc_span::sym::map)
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} else {
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false
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if let Some(expr) = get_parent_expr(cx, expr)
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&& is_trait_method(cx, expr, sym::Iterator)
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&& let hir::ExprKind::MethodCall(path, _, _, _) = expr.kind
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&& path.ident.name == rustc_span::sym::map
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{
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return true;
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}
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false
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}
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#[allow(clippy::too_many_arguments)]
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pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, filter_arg: &hir::Expr<'_>, filter_span: Span) {
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let is_iterator = is_trait_method(cx, expr, sym::Iterator);
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let parent_is_not_map = !parent_is_map(cx, expr);
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enum FilterType {
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IsSome,
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IsOk,
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}
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if is_iterator
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&& parent_is_not_map
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&& is_method(cx, filter_arg, sym!(is_some))
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&& !span_contains_comment(cx.sess().source_map(), filter_span.with_hi(expr.span.hi()))
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/// Returns the `FilterType` of the expression if it is a filter over an Iter<Option> or
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/// Iter<Result> with the parent expression not being a map, and not having a comment in the span of
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/// the filter. If it is not a filter over an Iter<Option> or Iter<Result> then it returns None
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///
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/// How this is done:
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/// 1. we know that this is invoked in a method call with `filter` as the method name via `mod.rs`
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/// 2. we check that we are in a trait method. Therefore we are in an
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/// `(x as Iterator).filter({filter_arg})` method call.
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/// 3. we check that the parent expression is not a map. This is because we don't want to lint
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/// twice, and we already have a specialized lint for that.
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/// 4. we check that the span of the filter does not contain a comment.
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/// 5. we get the type of the `Item` in the `Iterator`, and compare against the type of Option and
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/// Result.
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/// 6. we finally check the contents of the filter argument to see if it is a call to `is_some` or
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/// `is_ok`.
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/// 7. if all of the above are true, then we return the `FilterType`
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fn expression_type(
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cx: &LateContext<'_>,
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expr: &hir::Expr<'_>,
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filter_arg: &hir::Expr<'_>,
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filter_span: Span,
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) -> Option<FilterType> {
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if !is_trait_method(cx, expr, sym::Iterator)
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|| parent_is_map(cx, expr)
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|| span_contains_comment(cx.sess().source_map(), filter_span.with_hi(expr.span.hi()))
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{
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span_lint_and_sugg(
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cx,
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ITER_FILTER_IS_SOME,
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filter_span.with_hi(expr.span.hi()),
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"`filter` for `is_some` on iterator over `Option`",
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"consider using `flatten` instead",
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reindent_multiline(Cow::Borrowed("flatten()"), true, indent_of(cx, filter_span)).into_owned(),
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Applicability::HasPlaceholders,
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);
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return None;
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}
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if is_iterator
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&& parent_is_not_map
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&& is_method(cx, filter_arg, sym!(is_ok))
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&& !span_contains_comment(cx.sess().source_map(), filter_span.with_hi(expr.span.hi()))
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if let hir::ExprKind::MethodCall(_, receiver, _, _) = expr.kind
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&& let receiver_ty = cx.typeck_results().expr_ty(receiver)
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&& let Some(iter_item_ty) = get_iterator_item_ty(cx, receiver_ty)
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{
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span_lint_and_sugg(
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if let Some(opt_defid) = cx.tcx.get_diagnostic_item(sym::Option)
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&& let opt_ty = cx.tcx.type_of(opt_defid).skip_binder()
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&& iter_item_ty.ty_adt_def() == opt_ty.ty_adt_def()
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&& is_method(cx, filter_arg, sym::Option, sym!(is_some), &[])
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{
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return Some(FilterType::IsSome);
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}
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if let Some(opt_defid) = cx.tcx.get_diagnostic_item(sym::Result)
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&& let opt_ty = cx.tcx.type_of(opt_defid).skip_binder()
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&& iter_item_ty.ty_adt_def() == opt_ty.ty_adt_def()
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&& is_method(cx, filter_arg, sym::Result, sym!(is_ok), &[])
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{
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return Some(FilterType::IsOk);
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}
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}
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None
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}
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pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, filter_arg: &hir::Expr<'_>, filter_span: Span) {
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// we are in a filter inside an iterator
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match expression_type(cx, expr, filter_arg, filter_span) {
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None => (),
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Some(FilterType::IsOk) => span_lint_and_sugg(
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cx,
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ITER_FILTER_IS_OK,
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filter_span.with_hi(expr.span.hi()),
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@ -82,6 +183,15 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, filter_arg: &hir
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"consider using `flatten` instead",
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reindent_multiline(Cow::Borrowed("flatten()"), true, indent_of(cx, filter_span)).into_owned(),
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Applicability::HasPlaceholders,
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);
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),
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Some(FilterType::IsSome) => span_lint_and_sugg(
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cx,
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ITER_FILTER_IS_SOME,
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filter_span.with_hi(expr.span.hi()),
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"`filter` for `is_some` on iterator over `Option`",
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"consider using `flatten` instead",
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reindent_multiline(Cow::Borrowed("flatten()"), true, indent_of(cx, filter_span)).into_owned(),
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Applicability::HasPlaceholders,
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),
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}
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}
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@ -1,21 +1,72 @@
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#![warn(clippy::iter_filter_is_ok)]
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#![allow(
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clippy::map_identity,
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clippy::result_filter_map,
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clippy::needless_borrow,
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clippy::redundant_closure
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)]
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fn main() {
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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{
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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#[rustfmt::skip]
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let _ = vec![Ok(1), Err(2)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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}
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#[rustfmt::skip]
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let _ = vec![Ok(1), Err(2)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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{
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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#[rustfmt::skip]
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let _ = vec![Ok(1), Err(2)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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}
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{
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let _ = vec![Ok(1), Err(2), Ok(3)]
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.into_iter()
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.flatten();
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//~^ HELP: consider using `flatten` instead
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let _ = vec![Ok(1), Err(2), Ok(3)]
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.into_iter()
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.flatten();
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//~^ HELP: consider using `flatten` instead
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#[rustfmt::skip]
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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}
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{
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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#[rustfmt::skip]
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let _ = vec![Ok(1), Err(2)].into_iter().flatten();
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//~^ HELP: consider using `flatten` instead
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}
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}
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fn avoid_linting_when_filter_has_side_effects() {
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// Don't lint below
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let mut counter = 0;
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let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| {
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counter += 1;
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o.is_ok()
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});
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}
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fn avoid_linting_when_commented() {
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let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| {
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// Roses are red,
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// Violets are blue,
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@ -24,3 +75,131 @@ fn main() {
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o.is_ok()
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});
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}
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fn ice_12058() {
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// check that checking the parent node doesn't cause an ICE
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// by indexing the parameters of a closure without parameters
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Some(1).or_else(|| {
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vec![Ok(1), Err(())].into_iter().filter(|z| *z != Ok(2));
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None
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});
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}
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fn avoid_linting_map() {
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// should not lint
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let _ = vec![Ok(1), Err(())]
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.into_iter()
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.filter(|o| o.is_ok())
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.map(|o| o.unwrap());
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// should not lint
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let _ = vec![Ok(1), Err(())].into_iter().filter(|o| o.is_ok()).map(|o| o);
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}
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fn avoid_false_positive_due_to_is_ok_and_iterator_impl() {
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#[derive(Default, Clone)]
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struct Foo {}
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|
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impl Foo {
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fn is_ok(&self) -> bool {
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true
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}
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}
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impl Iterator for Foo {
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type Item = Foo;
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fn next(&mut self) -> Option<Self::Item> {
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Some(Foo::default())
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}
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}
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let data = vec![Foo::default()];
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// should not lint
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let _ = data.clone().into_iter().filter(Foo::is_ok);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_ok());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_ok_and_into_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_ok(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_ok);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_ok());
|
||||
}
|
||||
|
||||
fn avoid_fp_for_trivial() {
|
||||
let _ = vec![Ok(1), Err(()), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| (Err(()) as Result<i32, ()>).is_ok());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_method_name() {
|
||||
fn is_ok(x: &Result<i32, i32>) -> bool {
|
||||
x.is_ok()
|
||||
}
|
||||
|
||||
vec![Ok(1), Err(2), Ok(3)].into_iter().filter(is_ok);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_due_to_trait_type() {
|
||||
struct Foo {
|
||||
bar: i32,
|
||||
}
|
||||
impl Foo {
|
||||
fn is_ok(obj: &Result<i32, i32>) -> bool {
|
||||
obj.is_ok()
|
||||
}
|
||||
}
|
||||
vec![Ok(1), Err(2), Ok(3)].into_iter().filter(Foo::is_ok);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var() {
|
||||
let outside: Result<i32, ()> = Ok(1);
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_ok());
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Result::is_ok(&outside));
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::result::Result::is_ok(&outside));
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var_mix_match_types() {
|
||||
let outside = Some(1);
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_some());
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Option::is_some(&outside));
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::option::Option::is_some(&outside));
|
||||
}
|
||||
|
||||
@ -1,21 +1,72 @@
|
||||
#![warn(clippy::iter_filter_is_ok)]
|
||||
#![allow(
|
||||
clippy::map_identity,
|
||||
clippy::result_filter_map,
|
||||
clippy::needless_borrow,
|
||||
clippy::redundant_closure
|
||||
)]
|
||||
|
||||
fn main() {
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(Result::is_ok);
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|a| a.is_ok());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
{
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(Result::is_ok);
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|a| a.is_ok());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| { o.is_ok() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| { o.is_ok() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
{
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|&a| a.is_ok());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|&a| a.is_ok());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Ok(1), Err(2)].into_iter().filter(|&o| { o.is_ok() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
{
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
.filter(std::result::Result::is_ok);
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
.filter(|a| std::result::Result::is_ok(a));
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|a| { std::result::Result::is_ok(a) });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
{
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|ref a| a.is_ok());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|ref a| a.is_ok());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Ok(1), Err(2)].into_iter().filter(|ref o| { o.is_ok() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
}
|
||||
|
||||
fn avoid_linting_when_filter_has_side_effects() {
|
||||
// Don't lint below
|
||||
let mut counter = 0;
|
||||
let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| {
|
||||
counter += 1;
|
||||
o.is_ok()
|
||||
});
|
||||
}
|
||||
|
||||
fn avoid_linting_when_commented() {
|
||||
let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| {
|
||||
// Roses are red,
|
||||
// Violets are blue,
|
||||
@ -24,3 +75,131 @@ fn main() {
|
||||
o.is_ok()
|
||||
});
|
||||
}
|
||||
|
||||
fn ice_12058() {
|
||||
// check that checking the parent node doesn't cause an ICE
|
||||
// by indexing the parameters of a closure without parameters
|
||||
Some(1).or_else(|| {
|
||||
vec![Ok(1), Err(())].into_iter().filter(|z| *z != Ok(2));
|
||||
None
|
||||
});
|
||||
}
|
||||
|
||||
fn avoid_linting_map() {
|
||||
// should not lint
|
||||
let _ = vec![Ok(1), Err(())]
|
||||
.into_iter()
|
||||
.filter(|o| o.is_ok())
|
||||
.map(|o| o.unwrap());
|
||||
|
||||
// should not lint
|
||||
let _ = vec![Ok(1), Err(())].into_iter().filter(|o| o.is_ok()).map(|o| o);
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_ok_and_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_ok(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for Foo {
|
||||
type Item = Foo;
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
Some(Foo::default())
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_ok);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_ok());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_ok_and_into_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_ok(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_ok);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_ok());
|
||||
}
|
||||
|
||||
fn avoid_fp_for_trivial() {
|
||||
let _ = vec![Ok(1), Err(()), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| (Err(()) as Result<i32, ()>).is_ok());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_method_name() {
|
||||
fn is_ok(x: &Result<i32, i32>) -> bool {
|
||||
x.is_ok()
|
||||
}
|
||||
|
||||
vec![Ok(1), Err(2), Ok(3)].into_iter().filter(is_ok);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_due_to_trait_type() {
|
||||
struct Foo {
|
||||
bar: i32,
|
||||
}
|
||||
impl Foo {
|
||||
fn is_ok(obj: &Result<i32, i32>) -> bool {
|
||||
obj.is_ok()
|
||||
}
|
||||
}
|
||||
vec![Ok(1), Err(2), Ok(3)].into_iter().filter(Foo::is_ok);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var() {
|
||||
let outside: Result<i32, ()> = Ok(1);
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_ok());
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Result::is_ok(&outside));
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::result::Result::is_ok(&outside));
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var_mix_match_types() {
|
||||
let outside = Some(1);
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_some());
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Option::is_some(&outside));
|
||||
|
||||
let _ = vec![Ok(1), Err(2), Ok(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::option::Option::is_some(&outside));
|
||||
}
|
||||
|
||||
@ -1,23 +1,77 @@
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:4:52
|
||||
--> $DIR/iter_filter_is_ok.rs:11:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(Result::is_ok);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(Result::is_ok);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
|
||||
= note: `-D clippy::iter-filter-is-ok` implied by `-D warnings`
|
||||
= help: to override `-D warnings` add `#[allow(clippy::iter_filter_is_ok)]`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:6:52
|
||||
--> $DIR/iter_filter_is_ok.rs:13:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|a| a.is_ok());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|a| a.is_ok());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:10:45
|
||||
--> $DIR/iter_filter_is_ok.rs:16:49
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| { o.is_ok() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
LL | let _ = vec![Ok(1), Err(2)].into_iter().filter(|o| { o.is_ok() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:21:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|&a| a.is_ok());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:24:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|&a| a.is_ok());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:28:49
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2)].into_iter().filter(|&o| { o.is_ok() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:35:14
|
||||
|
|
||||
LL | .filter(std::result::Result::is_ok);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:40:14
|
||||
|
|
||||
LL | .filter(|a| std::result::Result::is_ok(a));
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:43:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|a| { std::result::Result::is_ok(a) });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:48:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|ref a| a.is_ok());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:51:56
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2), Ok(3)].into_iter().filter(|ref a| a.is_ok());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_ok` on iterator over `Result`s
|
||||
--> $DIR/iter_filter_is_ok.rs:55:49
|
||||
|
|
||||
LL | let _ = vec![Ok(1), Err(2)].into_iter().filter(|ref o| { o.is_ok() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: aborting due to 12 previous errors
|
||||
|
||||
|
||||
@ -1,23 +1,70 @@
|
||||
#![warn(clippy::iter_filter_is_some)]
|
||||
#![allow(
|
||||
clippy::map_identity,
|
||||
clippy::result_filter_map,
|
||||
clippy::needless_borrow,
|
||||
clippy::option_filter_map,
|
||||
clippy::redundant_closure
|
||||
)]
|
||||
|
||||
use std::collections::HashMap;
|
||||
|
||||
fn main() {
|
||||
let _ = vec![Some(1)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
let _ = vec![Some(1)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().flatten();
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
}
|
||||
|
||||
fn avoid_linting_when_filter_has_side_effects() {
|
||||
// Don't lint below
|
||||
let mut counter = 0;
|
||||
let _ = vec![Some(1)].into_iter().filter(|o| {
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|o| {
|
||||
counter += 1;
|
||||
o.is_some()
|
||||
});
|
||||
}
|
||||
|
||||
let _ = vec![Some(1)].into_iter().filter(|o| {
|
||||
fn avoid_linting_when_commented() {
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|o| {
|
||||
// Roses are red,
|
||||
// Violets are blue,
|
||||
// `Err` is not an `Option`,
|
||||
@ -25,3 +72,169 @@ fn main() {
|
||||
o.is_some()
|
||||
});
|
||||
}
|
||||
|
||||
fn ice_12058() {
|
||||
// check that checking the parent node doesn't cause an ICE
|
||||
// by indexing the parameters of a closure without parameters
|
||||
Some(1).or_else(|| {
|
||||
vec![Some(1), None, Some(3)].into_iter().filter(|z| *z != Some(2));
|
||||
None
|
||||
});
|
||||
}
|
||||
|
||||
fn avoid_linting_map() {
|
||||
// should not lint
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.filter(|o| o.is_some())
|
||||
.map(|o| o.unwrap());
|
||||
|
||||
// should not lint
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.filter(|o| o.is_some())
|
||||
.map(|o| o);
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_some_and_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_some(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for Foo {
|
||||
type Item = Foo;
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
Some(Foo::default())
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_some);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_some());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_some_and_into_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_some(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_some);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_some());
|
||||
}
|
||||
|
||||
fn avoid_unpack_fp() {
|
||||
let _ = vec![(Some(1), None), (None, Some(3))]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|(a, _)| a.is_some());
|
||||
let _ = vec![(Some(1), None), (None, Some(3))]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|(a, _)| a.is_some())
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
let m = HashMap::from([(1, 1)]);
|
||||
let _ = vec![1, 2, 4].into_iter().filter(|a| m.get(a).is_some());
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_for_external() {
|
||||
let value = HashMap::from([(1, 1)]);
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| value.get(&1).is_some());
|
||||
|
||||
let value = Option::Some(1);
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| value.is_some());
|
||||
}
|
||||
|
||||
fn avoid_fp_for_trivial() {
|
||||
let value = HashMap::from([(1, 1)]);
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Some(1).is_some());
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| None::<i32>.is_some());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_method_name() {
|
||||
fn is_some(x: &Option<i32>) -> bool {
|
||||
x.is_some()
|
||||
}
|
||||
|
||||
vec![Some(1), None, Some(3)].into_iter().filter(is_some);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_due_to_trait_type() {
|
||||
struct Foo {
|
||||
bar: i32,
|
||||
}
|
||||
impl Foo {
|
||||
fn is_some(obj: &Option<i32>) -> bool {
|
||||
obj.is_some()
|
||||
}
|
||||
}
|
||||
vec![Some(1), None, Some(3)].into_iter().filter(Foo::is_some);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var() {
|
||||
let outside = Some(1);
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_some());
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Option::is_some(&outside));
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::option::Option::is_some(&outside));
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var_mix_match_types() {
|
||||
let outside: Result<i32, ()> = Ok(1);
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_ok());
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Result::is_ok(&outside));
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::result::Result::is_ok(&outside));
|
||||
}
|
||||
|
||||
@ -1,23 +1,70 @@
|
||||
#![warn(clippy::iter_filter_is_some)]
|
||||
#![allow(
|
||||
clippy::map_identity,
|
||||
clippy::result_filter_map,
|
||||
clippy::needless_borrow,
|
||||
clippy::option_filter_map,
|
||||
clippy::redundant_closure
|
||||
)]
|
||||
|
||||
use std::collections::HashMap;
|
||||
|
||||
fn main() {
|
||||
let _ = vec![Some(1)].into_iter().filter(Option::is_some);
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
let _ = vec![Some(1)].into_iter().filter(|o| o.is_some());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(Option::is_some);
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|a| a.is_some());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|o| { o.is_some() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1)].into_iter().filter(|o| { o.is_some() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.filter(std::option::Option::is_some);
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.filter(|a| std::option::Option::is_some(a));
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|a| { std::option::Option::is_some(a) });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|&a| a.is_some());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|&o| { o.is_some() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
|
||||
{
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|ref a| a.is_some());
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
|
||||
#[rustfmt::skip]
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|ref o| { o.is_some() });
|
||||
//~^ HELP: consider using `flatten` instead
|
||||
}
|
||||
}
|
||||
|
||||
fn avoid_linting_when_filter_has_side_effects() {
|
||||
// Don't lint below
|
||||
let mut counter = 0;
|
||||
let _ = vec![Some(1)].into_iter().filter(|o| {
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|o| {
|
||||
counter += 1;
|
||||
o.is_some()
|
||||
});
|
||||
}
|
||||
|
||||
let _ = vec![Some(1)].into_iter().filter(|o| {
|
||||
fn avoid_linting_when_commented() {
|
||||
let _ = vec![Some(1), None, Some(3)].into_iter().filter(|o| {
|
||||
// Roses are red,
|
||||
// Violets are blue,
|
||||
// `Err` is not an `Option`,
|
||||
@ -25,3 +72,169 @@ fn main() {
|
||||
o.is_some()
|
||||
});
|
||||
}
|
||||
|
||||
fn ice_12058() {
|
||||
// check that checking the parent node doesn't cause an ICE
|
||||
// by indexing the parameters of a closure without parameters
|
||||
Some(1).or_else(|| {
|
||||
vec![Some(1), None, Some(3)].into_iter().filter(|z| *z != Some(2));
|
||||
None
|
||||
});
|
||||
}
|
||||
|
||||
fn avoid_linting_map() {
|
||||
// should not lint
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.filter(|o| o.is_some())
|
||||
.map(|o| o.unwrap());
|
||||
|
||||
// should not lint
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
.filter(|o| o.is_some())
|
||||
.map(|o| o);
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_some_and_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_some(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
impl Iterator for Foo {
|
||||
type Item = Foo;
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
Some(Foo::default())
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_some);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_some());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_is_some_and_into_iterator_impl() {
|
||||
#[derive(Default, Clone)]
|
||||
struct Foo {}
|
||||
|
||||
impl Foo {
|
||||
fn is_some(&self) -> bool {
|
||||
true
|
||||
}
|
||||
}
|
||||
|
||||
let data = vec![Foo::default()];
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(Foo::is_some);
|
||||
// should not lint
|
||||
let _ = data.clone().into_iter().filter(|f| f.is_some());
|
||||
}
|
||||
|
||||
fn avoid_unpack_fp() {
|
||||
let _ = vec![(Some(1), None), (None, Some(3))]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|(a, _)| a.is_some());
|
||||
let _ = vec![(Some(1), None), (None, Some(3))]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|(a, _)| a.is_some())
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
let m = HashMap::from([(1, 1)]);
|
||||
let _ = vec![1, 2, 4].into_iter().filter(|a| m.get(a).is_some());
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_for_external() {
|
||||
let value = HashMap::from([(1, 1)]);
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| value.get(&1).is_some());
|
||||
|
||||
let value = Option::Some(1);
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| value.is_some());
|
||||
}
|
||||
|
||||
fn avoid_fp_for_trivial() {
|
||||
let value = HashMap::from([(1, 1)]);
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Some(1).is_some());
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| None::<i32>.is_some());
|
||||
}
|
||||
|
||||
fn avoid_false_positive_due_to_method_name() {
|
||||
fn is_some(x: &Option<i32>) -> bool {
|
||||
x.is_some()
|
||||
}
|
||||
|
||||
vec![Some(1), None, Some(3)].into_iter().filter(is_some);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_due_to_trait_type() {
|
||||
struct Foo {
|
||||
bar: i32,
|
||||
}
|
||||
impl Foo {
|
||||
fn is_some(obj: &Option<i32>) -> bool {
|
||||
obj.is_some()
|
||||
}
|
||||
}
|
||||
vec![Some(1), None, Some(3)].into_iter().filter(Foo::is_some);
|
||||
// should not lint
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var() {
|
||||
let outside = Some(1);
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_some());
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Option::is_some(&outside));
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::option::Option::is_some(&outside));
|
||||
}
|
||||
|
||||
fn avoid_fp_with_call_to_outside_var_mix_match_types() {
|
||||
let outside: Result<i32, ()> = Ok(1);
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| outside.is_ok());
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| Result::is_ok(&outside));
|
||||
|
||||
let _ = vec![Some(1), None, Some(3)]
|
||||
.into_iter()
|
||||
// should not lint
|
||||
.filter(|o| std::result::Result::is_ok(&outside));
|
||||
}
|
||||
|
||||
@ -1,23 +1,65 @@
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:4:39
|
||||
--> $DIR/iter_filter_is_some.rs:14:58
|
||||
|
|
||||
LL | let _ = vec![Some(1)].into_iter().filter(Option::is_some);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(Option::is_some);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
|
||||
= note: `-D clippy::iter-filter-is-some` implied by `-D warnings`
|
||||
= help: to override `-D warnings` add `#[allow(clippy::iter_filter_is_some)]`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:6:39
|
||||
--> $DIR/iter_filter_is_some.rs:16:58
|
||||
|
|
||||
LL | let _ = vec![Some(1)].into_iter().filter(|o| o.is_some());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|a| a.is_some());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:10:39
|
||||
--> $DIR/iter_filter_is_some.rs:19:58
|
||||
|
|
||||
LL | let _ = vec![Some(1)].into_iter().filter(|o| { o.is_some() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|o| { o.is_some() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:26:14
|
||||
|
|
||||
LL | .filter(std::option::Option::is_some);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:31:14
|
||||
|
|
||||
LL | .filter(|a| std::option::Option::is_some(a));
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:34:58
|
||||
|
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|a| { std::option::Option::is_some(a) });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:39:58
|
||||
|
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|&a| a.is_some());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:43:58
|
||||
|
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|&o| { o.is_some() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:48:58
|
||||
|
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|ref a| a.is_some());
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: `filter` for `is_some` on iterator over `Option`
|
||||
--> $DIR/iter_filter_is_some.rs:52:58
|
||||
|
|
||||
LL | let _ = vec![Some(1), None, Some(3)].into_iter().filter(|ref o| { o.is_some() });
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `flatten` instead: `flatten()`
|
||||
|
||||
error: aborting due to 10 previous errors
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user