diff options
Diffstat (limited to '')
| -rw-r--r-- | src/tools/clippy/clippy_lints/src/matches/redundant_pattern_match.rs | 65 |
1 files changed, 34 insertions, 31 deletions
diff --git a/src/tools/clippy/clippy_lints/src/matches/redundant_pattern_match.rs b/src/tools/clippy/clippy_lints/src/matches/redundant_pattern_match.rs index c89784065..81bebff34 100644 --- a/src/tools/clippy/clippy_lints/src/matches/redundant_pattern_match.rs +++ b/src/tools/clippy/clippy_lints/src/matches/redundant_pattern_match.rs @@ -4,11 +4,12 @@ use clippy_utils::source::snippet; use clippy_utils::sugg::Sugg; use clippy_utils::ty::{is_type_diagnostic_item, needs_ordered_drop}; use clippy_utils::visitors::any_temporaries_need_ordered_drop; -use clippy_utils::{higher, is_lang_ctor, is_trait_method}; +use clippy_utils::{higher, is_trait_method}; use if_chain::if_chain; use rustc_ast::ast::LitKind; use rustc_errors::Applicability; -use rustc_hir::LangItem::{self, OptionSome, OptionNone, PollPending, PollReady, ResultOk, ResultErr}; +use rustc_hir::def::{DefKind, Res}; +use rustc_hir::LangItem::{self, OptionNone, OptionSome, PollPending, PollReady, ResultErr, ResultOk}; use rustc_hir::{Arm, Expr, ExprKind, Node, Pat, PatKind, QPath, UnOp}; use rustc_lint::LateContext; use rustc_middle::ty::{self, subst::GenericArgKind, DefIdTree, Ty}; @@ -87,15 +88,21 @@ fn find_sugg_for_if_let<'tcx>( } }, PatKind::Path(ref path) => { - let method = if is_lang_ctor(cx, path, OptionNone) { - "is_none()" - } else if is_lang_ctor(cx, path, PollPending) { - "is_pending()" + if let Res::Def(DefKind::Ctor(..), ctor_id) = cx.qpath_res(path, check_pat.hir_id) + && let Some(variant_id) = cx.tcx.opt_parent(ctor_id) + { + let method = if cx.tcx.lang_items().option_none_variant() == Some(variant_id) { + "is_none()" + } else if cx.tcx.lang_items().poll_pending_variant() == Some(variant_id) { + "is_pending()" + } else { + return; + }; + // `None` and `Pending` don't have an inner type. + (method, cx.tcx.types.unit) } else { return; - }; - // `None` and `Pending` don't have an inner type. - (method, cx.tcx.types.unit) + } }, _ => return, }; @@ -138,7 +145,7 @@ fn find_sugg_for_if_let<'tcx>( cx, REDUNDANT_PATTERN_MATCHING, let_pat.span, - &format!("redundant pattern matching, consider using `{}`", good_method), + &format!("redundant pattern matching, consider using `{good_method}`"), |diag| { // if/while let ... = ... { ... } // ^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -162,7 +169,7 @@ fn find_sugg_for_if_let<'tcx>( .maybe_par() .to_string(); - diag.span_suggestion(span, "try this", format!("{} {}.{}", keyword, sugg, good_method), app); + diag.span_suggestion(span, "try this", format!("{keyword} {sugg}.{good_method}"), app); if needs_drop { diag.note("this will change drop order of the result, as well as all temporaries"); @@ -213,7 +220,6 @@ pub(super) fn check_match<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, op if patterns.len() == 1 => { if let PatKind::Wild = patterns[0].kind { - find_good_method_for_match( cx, arms, @@ -253,12 +259,12 @@ pub(super) fn check_match<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, op cx, REDUNDANT_PATTERN_MATCHING, expr.span, - &format!("redundant pattern matching, consider using `{}`", good_method), + &format!("redundant pattern matching, consider using `{good_method}`"), |diag| { diag.span_suggestion( span, "try this", - format!("{}.{}", snippet(cx, result_expr.span, "_"), good_method), + format!("{}.{good_method}", snippet(cx, result_expr.span, "_")), Applicability::MaybeIncorrect, // snippet ); }, @@ -269,8 +275,8 @@ pub(super) fn check_match<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, op #[derive(Clone, Copy)] enum Item { - Lang(LangItem), - Diag(Symbol, Symbol), + Lang(LangItem), + Diag(Symbol, Symbol), } fn is_pat_variant(cx: &LateContext<'_>, pat: &Pat<'_>, path: &QPath<'_>, expected_item: Item) -> bool { @@ -285,15 +291,16 @@ fn is_pat_variant(cx: &LateContext<'_>, pat: &Pat<'_>, path: &QPath<'_>, expecte let ty = cx.typeck_results().pat_ty(pat); if is_type_diagnostic_item(cx, ty, expected_ty) { - let variant = ty.ty_adt_def() + let variant = ty + .ty_adt_def() .expect("struct pattern type is not an ADT") .variant_of_res(cx.qpath_res(path, pat.hir_id)); - return variant.name == expected_variant + return variant.name == expected_variant; } false - } + }, } } @@ -308,20 +315,16 @@ fn find_good_method_for_match<'a>( should_be_left: &'a str, should_be_right: &'a str, ) -> Option<&'a str> { - let pat_left = arms[0].pat; - let pat_right = arms[1].pat; + let first_pat = arms[0].pat; + let second_pat = arms[1].pat; - let body_node_pair = if ( - is_pat_variant(cx, pat_left, path_left, expected_item_left) - ) && ( - is_pat_variant(cx, pat_right, path_right, expected_item_right) - ) { + let body_node_pair = if (is_pat_variant(cx, first_pat, path_left, expected_item_left)) + && (is_pat_variant(cx, second_pat, path_right, expected_item_right)) + { (&arms[0].body.kind, &arms[1].body.kind) - } else if ( - is_pat_variant(cx, pat_left, path_left, expected_item_right) - ) && ( - is_pat_variant(cx, pat_right, path_right, expected_item_left) - ) { + } else if (is_pat_variant(cx, first_pat, path_left, expected_item_right)) + && (is_pat_variant(cx, second_pat, path_right, expected_item_left)) + { (&arms[1].body.kind, &arms[0].body.kind) } else { return None; |