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https://github.com/rust-lang/rust-clippy
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Span help without suggestion
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6 changed files with 23 additions and 82 deletions
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@ -6,7 +6,7 @@
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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 345 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
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[There are 346 lints included in this crate!](https://rust-lang.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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@ -3,7 +3,8 @@ use crate::utils::paths;
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use crate::utils::sugg::Sugg;
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use crate::utils::{
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expr_block, is_allowed, is_expn_of, match_qpath, match_type, multispan_sugg, remove_blocks, snippet,
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snippet_with_applicability, span_lint_and_sugg, span_lint_and_then, span_note_and_lint, walk_ptrs_ty,
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snippet_with_applicability, span_help_and_lint, span_lint_and_sugg, span_lint_and_then, span_note_and_lint,
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walk_ptrs_ty,
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};
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use if_chain::if_chain;
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use rustc::declare_lint_pass;
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@ -267,7 +268,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Matches {
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check_wild_err_arm(cx, ex, arms);
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check_wild_enum_match(cx, ex, arms);
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check_match_as_ref(cx, ex, arms, expr);
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check_wild_in_or_pats(cx, ex, arms);
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check_wild_in_or_pats(cx, arms);
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}
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if let ExprKind::Match(ref ex, ref arms, _) = expr.kind {
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check_match_ref_pats(cx, ex, arms, expr);
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@ -686,44 +687,17 @@ fn check_match_as_ref(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_>],
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}
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}
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fn check_wild_in_or_pats(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_>]) {
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let mut is_non_exhaustive_enum = false;
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let ty = cx.tables.expr_ty(ex);
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if ty.is_enum() {
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if let ty::Adt(def, _) = ty.kind {
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if def.is_variant_list_non_exhaustive() {
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is_non_exhaustive_enum = true;
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}
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}
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}
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fn check_wild_in_or_pats(cx: &LateContext<'_, '_>, arms: &[Arm<'_>]) {
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for arm in arms {
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if let PatKind::Or(ref fields) = arm.pat.kind {
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// look for multiple fields in this arm that contains at least one Wild pattern
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if fields.len() > 1 && fields.iter().any(is_wild) {
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span_lint_and_then(
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span_help_and_lint(
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cx,
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WILDCARD_IN_OR_PATTERNS,
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arm.pat.span,
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"wildcard pattern covers any other pattern as it will match anyway.",
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|db| {
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// handle case where a non exhaustive enum is being used
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if is_non_exhaustive_enum {
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db.span_suggestion(
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arm.pat.span,
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"consider handling `_` separately.",
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"_ => ...".to_string(),
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Applicability::MaybeIncorrect,
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);
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} else {
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db.span_suggestion(
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arm.pat.span,
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"consider replacing with wildcard pattern only",
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"_".to_string(),
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Applicability::MachineApplicable,
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);
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}
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},
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"Consider handling `_` separately.",
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);
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}
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}
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@ -6,7 +6,7 @@ pub use lint::Lint;
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pub use lint::LINT_LEVELS;
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// begin lint list, do not remove this comment, it’s used in `update_lints`
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pub const ALL_LINTS: [Lint; 345] = [
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pub const ALL_LINTS: [Lint; 346] = [
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Lint {
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name: "absurd_extreme_comparisons",
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group: "correctness",
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@ -1,38 +0,0 @@
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// run-rustfix
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#![warn(clippy::wildcard_in_or_patterns)]
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fn main() {
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match "foo" {
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"a" => {
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dbg!("matched a");
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},
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_ => {
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dbg!("matched (bar or) wild");
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},
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};
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match "foo" {
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"a" => {
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dbg!("matched a");
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},
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_ => {
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dbg!("matched (bar or bar2 or) wild");
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},
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};
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match "foo" {
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"a" => {
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dbg!("matched a");
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},
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_ => {
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dbg!("matched (bar or) wild");
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},
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};
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match "foo" {
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"a" => {
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dbg!("matched a");
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},
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_ => {
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dbg!("matched (bar or) wild");
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},
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};
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}
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@ -1,5 +1,3 @@
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// run-rustfix
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#![warn(clippy::wildcard_in_or_patterns)]
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fn main() {
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@ -1,28 +1,35 @@
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error: wildcard pattern covers any other pattern as it will match anyway.
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--> $DIR/wild_in_or_pats.rs:10:9
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--> $DIR/wild_in_or_pats.rs:8:9
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LL | "bar" | _ => {
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| ^^^^^^^^^ help: consider replacing with wildcard pattern only: `_`
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| ^^^^^^^^^
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= note: `-D clippy::wildcard-in-or-patterns` implied by `-D warnings`
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= help: Consider handling `_` separately.
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error: wildcard pattern covers any other pattern as it will match anyway.
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--> $DIR/wild_in_or_pats.rs:18:9
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--> $DIR/wild_in_or_pats.rs:16:9
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LL | "bar" | "bar2" | _ => {
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| ^^^^^^^^^^^^^^^^^^ help: consider replacing with wildcard pattern only: `_`
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| ^^^^^^^^^^^^^^^^^^
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= help: Consider handling `_` separately.
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error: wildcard pattern covers any other pattern as it will match anyway.
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--> $DIR/wild_in_or_pats.rs:26:9
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--> $DIR/wild_in_or_pats.rs:24:9
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LL | _ | "bar" | _ => {
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| ^^^^^^^^^^^^^ help: consider replacing with wildcard pattern only: `_`
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| ^^^^^^^^^^^^^
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= help: Consider handling `_` separately.
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error: wildcard pattern covers any other pattern as it will match anyway.
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--> $DIR/wild_in_or_pats.rs:34:9
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--> $DIR/wild_in_or_pats.rs:32:9
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LL | _ | "bar" => {
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| ^^^^^^^^^ help: consider replacing with wildcard pattern only: `_`
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| ^^^^^^^^^
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= help: Consider handling `_` separately.
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error: aborting due to 4 previous errors
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