-use crate::utils::span_lint;
+use clippy_utils::diagnostics::span_lint;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty;
use rustc_session::{declare_lint_pass, declare_tool_lint};
declare_clippy_lint! {
- /// **What it does:** Checks for needlessly including a base struct on update
+ /// ### What it does
+ /// Checks for needlessly including a base struct on update
/// when all fields are changed anyway.
///
/// This lint is not applied to structs marked with
/// [non_exhaustive](https://doc.rust-lang.org/reference/attributes/type_system.html).
///
- /// **Why is this bad?** This will cost resources (because the base has to be
+ /// ### Why is this bad?
+ /// This will cost resources (because the base has to be
/// somewhere), and make the code less readable.
///
- /// **Known problems:** None.
- ///
- /// **Example:**
+ /// ### Example
/// ```rust
/// # struct Point {
/// # x: i32,
impl<'tcx> LateLintPass<'tcx> for NeedlessUpdate {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
- if let ExprKind::Struct(_, ref fields, Some(ref base)) = expr.kind {
+ if let ExprKind::Struct(_, fields, Some(base)) = expr.kind {
let ty = cx.typeck_results().expr_ty(expr);
if let ty::Adt(def, _) = ty.kind() {
if fields.len() == def.non_enum_variant().fields.len()