Handle or patterns in single_match and single_match_else

Author: Jarcho

clippy_lints/src/matches/match_wild_enum.rs

@@ -176,9 +176,8 @@ enum CommonPrefixSearcher<'a> {
 }
 impl<'a> CommonPrefixSearcher<'a> {
     fn with_path(&mut self, path: &'a [PathSegment<'a>]) {
-        match path {
-            [path @ .., _] => self.with_prefix(path),
-            [] => (),
+        if let [path @ .., _] = path {
+            self.with_prefix(path);
         }
     }
 

clippy_lints/src/matches/overlapping_arms.rs

@@ -33,27 +33,25 @@ fn all_ranges<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>], ty: Ty<'tcx>)
         .filter_map(|arm| {
             if let Arm { pat, guard: None, .. } = *arm {
                 if let PatKind::Range(ref lhs, ref rhs, range_end) = pat.kind {
-                    let lhs_const = match lhs {
-                        Some(lhs) => constant(cx, cx.typeck_results(), lhs)?,
-                        None => {
-                            let min_val_const = ty.numeric_min_val(cx.tcx)?;
-                            let min_constant = mir::ConstantKind::from_value(
-                                cx.tcx.valtree_to_const_val((ty, min_val_const.to_valtree())),
-                                ty,
-                            );
-                            miri_to_const(cx, min_constant)?
-                        },
+                    let lhs_const = if let Some(lhs) = lhs {
+                        constant(cx, cx.typeck_results(), lhs)?
+                    } else {
+                        let min_val_const = ty.numeric_min_val(cx.tcx)?;
+                        let min_constant = mir::ConstantKind::from_value(
+                            cx.tcx.valtree_to_const_val((ty, min_val_const.to_valtree())),
+                            ty,
+                        );
+                        miri_to_const(cx, min_constant)?
                     };
-                    let rhs_const = match rhs {
-                        Some(rhs) => constant(cx, cx.typeck_results(), rhs)?,
-                        None => {
-                            let max_val_const = ty.numeric_max_val(cx.tcx)?;
-                            let max_constant = mir::ConstantKind::from_value(
-                                cx.tcx.valtree_to_const_val((ty, max_val_const.to_valtree())),
-                                ty,
-                            );
-                            miri_to_const(cx, max_constant)?
-                        },
+                    let rhs_const = if let Some(rhs) = rhs {
+                        constant(cx, cx.typeck_results(), rhs)?
+                    } else {
+                        let max_val_const = ty.numeric_max_val(cx.tcx)?;
+                        let max_constant = mir::ConstantKind::from_value(
+                            cx.tcx.valtree_to_const_val((ty, max_val_const.to_valtree())),
+                            ty,
+                        );
+                        miri_to_const(cx, max_constant)?
                     };
                     let lhs_val = lhs_const.int_value(cx, ty)?;
                     let rhs_val = rhs_const.int_value(cx, ty)?;