fixes for numerous clippy warnings

Author: hkBst

compiler/rustc_hir_typeck/src/pat.rs

@@ -47,7 +47,7 @@ You can read more about trait objects in the Trait Objects section of the Refere
 https://doc.rust-lang.org/reference/types.html#trait-objects";
 
 fn is_number(text: &str) -> bool {
-    text.chars().all(|c: char| c.is_digit(10))
+    text.chars().all(|c: char| c.is_ascii_digit())
 }
 
 /// Information about the expected type at the top level of type checking a pattern.
@@ -262,8 +262,9 @@ enum InheritedRefMatchRule {
         /// pattern matches a given type:
         /// - If the underlying type is not a reference, a reference pattern may eat the inherited reference;
         /// - If the underlying type is a reference, a reference pattern matches if it can eat either one
-        ///    of the underlying and inherited references. E.g. a `&mut` pattern is allowed if either the
-        ///    underlying type is `&mut` or the inherited reference is `&mut`.
+        ///   of the underlying and inherited references. E.g. a `&mut` pattern is allowed if either the
+        ///   underlying type is `&mut` or the inherited reference is `&mut`.
+        ///
         /// If `false`, a reference pattern is only matched against the underlying type.
         /// This is `false` for stable Rust and `true` for both the `ref_pat_eat_one_layer_2024` and
         /// `ref_pat_eat_one_layer_2024_structural` feature gates.
@@ -1069,7 +1070,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 {
                     if !self.tcx.features().mut_ref() {
                         feature_err(
-                            &self.tcx.sess,
+                            self.tcx.sess,
                             sym::mut_ref,
                             pat.span.until(ident.span),
                             "binding cannot be both mutable and by-reference",
@@ -1487,31 +1488,24 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         opt_def_id: Option<hir::def_id::DefId>,
         ident: Ident,
     ) -> bool {
-        match opt_def_id {
-            Some(def_id) => match self.tcx.hir_get_if_local(def_id) {
-                Some(hir::Node::Item(hir::Item {
-                    kind: hir::ItemKind::Const(_, _, _, body_id),
-                    ..
-                })) => match self.tcx.hir_node(body_id.hir_id) {
-                    hir::Node::Expr(expr) => {
-                        if hir::is_range_literal(expr) {
-                            let span = self.tcx.hir_span(body_id.hir_id);
-                            if let Ok(snip) = self.tcx.sess.source_map().span_to_snippet(span) {
-                                e.span_suggestion_verbose(
-                                    ident.span,
-                                    "you may want to move the range into the match block",
-                                    snip,
-                                    Applicability::MachineApplicable,
-                                );
-                                return true;
-                            }
-                        }
-                    }
-                    _ => (),
-                },
-                _ => (),
-            },
-            _ => (),
+        if let Some(def_id) = opt_def_id
+            && let Some(hir::Node::Item(hir::Item {
+                kind: hir::ItemKind::Const(_, _, _, body_id),
+                ..
+            })) = self.tcx.hir_get_if_local(def_id)
+            && let hir::Node::Expr(expr) = self.tcx.hir_node(body_id.hir_id)
+            && hir::is_range_literal(expr)
+        {
+            let span = self.tcx.hir_span(body_id.hir_id);
+            if let Ok(snip) = self.tcx.sess.source_map().span_to_snippet(span) {
+                e.span_suggestion_verbose(
+                    ident.span,
+                    "you may want to move the range into the match block",
+                    snip,
+                    Applicability::MachineApplicable,
+                );
+                return true;
+            }
         }
         false
     }
@@ -1529,7 +1523,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         if let Some(span) = self.tcx.hir_res_span(pat_res) {
             e.span_label(span, format!("{} defined here", res.descr()));
-            if let [hir::PathSegment { ident, .. }] = &*segments {
+            if let [hir::PathSegment { ident, .. }] = segments {
                 e.span_label(
                     pat_span,
                     format!(
@@ -1557,17 +1551,17 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             _ => (None, None),
                         };
 
-                        let is_range = match type_def_id.and_then(|id| self.tcx.as_lang_item(id)) {
+                        let is_range = matches!(
+                            type_def_id.and_then(|id| self.tcx.as_lang_item(id)),
                             Some(
                                 LangItem::Range
-                                | LangItem::RangeFrom
-                                | LangItem::RangeTo
-                                | LangItem::RangeFull
-                                | LangItem::RangeInclusiveStruct
-                                | LangItem::RangeToInclusive,
-                            ) => true,
-                            _ => false,
-                        };
+                                    | LangItem::RangeFrom
+                                    | LangItem::RangeTo
+                                    | LangItem::RangeFull
+                                    | LangItem::RangeInclusiveStruct
+                                    | LangItem::RangeToInclusive,
+                            )
+                        );
                         if is_range {
                             if !self.maybe_suggest_range_literal(&mut e, item_def_id, *ident) {
                                 let msg = "constants only support matching by type, \