lint if deref_addrof is allowed

Author: lengyijun

clippy_lints/src/needless_deref.rs

@@ -1,4 +1,6 @@
+use crate::reference::DEREF_ADDROF;
 use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then};
+use clippy_utils::is_lint_allowed;
 use clippy_utils::source::snippet_opt;
 use clippy_utils::ty::implements_trait;
 use rustc_hir::{ExprKind, UnOp};
@@ -55,11 +57,14 @@ impl LateLintPass<'_> for NeedlessDeref {
                     if span.from_expansion() {
                         return;
                     }
-                    if matches!(deref_expr.kind, ExprKind::Path(..) ){
+                    if matches!(deref_expr.kind, ExprKind::Path(..)) {
                         let parent_node = map.find(parent_hir_id);
                         if let Some(rustc_hir::Node::Expr(parent_expr)) = parent_node {
-                            if matches!(parent_expr.kind, ExprKind::Unary(UnOp::Deref, ..)) ||
-                               matches!(parent_expr.kind, ExprKind::AddrOf(..) ) {
+                            if matches!(parent_expr.kind, ExprKind::AddrOf(..)) {
+                                return;
+                            }
+                            if matches!(parent_expr.kind, ExprKind::Unary(UnOp::Deref, ..)) &&
+                               !is_lint_allowed(cx, DEREF_ADDROF, parent_expr.hir_id) {
                                 return;
                             }
                         }