Improve code readability

Author: GuillaumeGomez

clippy_lints/src/methods/unnecessary_to_owned.rs

@@ -621,16 +621,14 @@ fn check_if_applicable_to_argument<'tcx>(cx: &LateContext<'tcx>, arg: &Expr<'tcx
         && let ExprKind::MethodCall(method_path, caller, &[], _) = expr.kind
         && let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id)
         && let method_name = method_path.ident.name.as_str()
-        && match method_name {
-            "to_owned" => cx.tcx.is_diagnostic_item(sym::to_owned_method, method_def_id),
-            "to_string" => cx.tcx.is_diagnostic_item(sym::to_string_method, method_def_id),
-            "to_vec" => cx
-                .tcx
-                .impl_of_method(method_def_id)
-                .filter(|&impl_did| cx.tcx.type_of(impl_did).instantiate_identity().is_slice())
-                .is_some(),
-            _ => false,
-        }
+        && (cx.tcx.is_diagnostic_item(sym::to_owned_method, method_def_id)
+              || cx.tcx.is_diagnostic_item(sym::to_string_method, method_def_id)
+              || (
+                    method_name == "to_vec" &&
+                    cx.tcx.impl_of_method(method_def_id).filter(|&impl_did| {
+                        cx.tcx.type_of(impl_did).instantiate_identity().is_slice()
+                    })
+                .is_some()))
         && let original_arg_ty = cx.typeck_results().node_type(caller.hir_id).peel_refs()
         && let arg_ty = cx.typeck_results().expr_ty(arg)
         && let ty::Ref(_, arg_ty, Mutability::Not) = arg_ty.kind()