Fix dogfooding

Author: est31

clippy_lints/src/dereference.rs

@@ -274,9 +274,7 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing<'tcx> {
         }
 
         let typeck = cx.typeck_results();
-        let (kind, sub_expr) = if let Some(x) = try_parse_ref_op(cx.tcx, typeck, expr) {
-            x
-        } else {
+        let Some((kind, sub_expr)) = try_parse_ref_op(cx.tcx, typeck, expr) else {
             // The whole chain of reference operations has been seen
             if let Some((state, data)) = self.state.take() {
                 report(cx, expr, state, data);

clippy_utils/src/consts.rs

@@ -147,9 +147,8 @@ impl Constant {
                 _ => None,
             },
             (&Self::Vec(ref l), &Self::Vec(ref r)) => {
-                let cmp_type = match *cmp_type.kind() {
-                    ty::Array(ty, _) | ty::Slice(ty) => ty,
-                    _ => return None,
+                let (ty::Array(cmp_type, _) | ty::Slice(cmp_type)) = *cmp_type.kind() else {
+                    return None
                 };
                 iter::zip(l, r)
                     .map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
@@ -401,10 +400,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
         use self::Constant::{Int, F32, F64};
         match *o {
             Int(value) => {
-                let ity = match *ty.kind() {
-                    ty::Int(ity) => ity,
-                    _ => return None,
-                };
+                let ty::Int(ity) = *ty.kind() else { return None };
                 // sign extend
                 let value = sext(self.lcx.tcx, value, ity);
                 let value = value.checked_neg()?;

clippy_utils/src/hir_utils.rs

@@ -131,13 +131,10 @@ impl HirEqInterExpr<'_, '_, '_> {
             ([], None, [], None) => {
                 // For empty blocks, check to see if the tokens are equal. This will catch the case where a macro
                 // expanded to nothing, or the cfg attribute was used.
-                let (left, right) = match (
+                let (Some(left), Some(right)) = (
                     snippet_opt(self.inner.cx, left.span),
                     snippet_opt(self.inner.cx, right.span),
-                ) {
-                    (Some(left), Some(right)) => (left, right),
-                    _ => return true,
-                };
+                ) else { return true };
                 let mut left_pos = 0;
                 let left = tokenize(&left)
                     .map(|t| {