Remove hir::Item::attrs.

[rust.git] / clippy_lints / src / needless_borrow.rs

diff --git a/clippy_lints/src/needless_borrow.rs b/clippy_lints/src/needless_borrow.rs
index 9391049c6e8f95d6513b0c8444bdcd94b5d3224a..1aadcfd87b60f73a1dc44626adc30300cae35d93 100644 (file)
--- a/clippy_lints/src/needless_borrow.rs
+++ b/clippy_lints/src/needless_borrow.rs
@@ -2,14 +2,15 @@
 //!
 //! This lint is **warn** by default
 
-use crate::utils::{snippet_opt, span_lint_and_then};
+use crate::utils::{is_automatically_derived, snippet_opt, span_lint_and_then};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::{BindingAnnotation, BorrowKind, Expr, ExprKind, HirId, Item, Mutability, Pat, PatKind};
+use rustc_hir::{BindingAnnotation, BorrowKind, Expr, ExprKind, Item, Mutability, Pat, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::def_id::LocalDefId;
 
 declare_clippy_lint! {
     /// **What it does:** Checks for address of operations (`&`) that are going to
@@ -35,7 +36,7 @@
 
 #[derive(Default)]
 pub struct NeedlessBorrow {
-    derived_item: Option<HirId>,
+    derived_item: Option<LocalDefId>,
 }
 
 impl_lint_pass!(NeedlessBorrow => [NEEDLESS_BORROW]);
@@ -46,7 +47,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
             return;
         }
         if let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, ref inner) = e.kind {
-            if let ty::Ref(..) = cx.typeck_results().expr_ty(inner).kind {
+            if let ty::Ref(_, ty, _) = cx.typeck_results().expr_ty(inner).kind() {
                 for adj3 in cx.typeck_results().expr_adjustments(e).windows(3) {
                     if let [Adjustment {
                         kind: Adjust::Deref(_), ..
@@ -61,8 +62,11 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
                             cx,
                             NEEDLESS_BORROW,
                             e.span,
-                            "this expression borrows a reference that is immediately dereferenced \
+                            &format!(
+                                "this expression borrows a reference (`&{}`) that is immediately dereferenced \
                              by the compiler",
+                                ty
+                            ),
                             |diag| {
                                 if let Some(snippet) = snippet_opt(cx, inner.span) {
                                     diag.span_suggestion(
@@ -85,9 +89,9 @@ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
         }
         if_chain! {
             if let PatKind::Binding(BindingAnnotation::Ref, .., name, _) = pat.kind;
-            if let ty::Ref(_, tam, mutbl) = cx.typeck_results().pat_ty(pat).kind;
+            if let ty::Ref(_, tam, mutbl) = *cx.typeck_results().pat_ty(pat).kind();
             if mutbl == Mutability::Not;
-            if let ty::Ref(_, _, mutbl) = tam.kind;
+            if let ty::Ref(_, _, mutbl) = *tam.kind();
             // only lint immutable refs, because borrowed `&mut T` cannot be moved out
             if mutbl == Mutability::Not;
             then {
@@ -111,16 +115,17 @@ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
         }
     }
 
-    fn check_item(&mut self, _: &LateContext<'tcx>, item: &'tcx Item<'_>) {
-        if item.attrs.iter().any(|a| a.has_name(sym!(automatically_derived))) {
+    fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+        let attrs = cx.tcx.hir().attrs(item.hir_id());
+        if is_automatically_derived(attrs) {
             debug_assert!(self.derived_item.is_none());
-            self.derived_item = Some(item.hir_id);
+            self.derived_item = Some(item.def_id);
         }
     }
 
     fn check_item_post(&mut self, _: &LateContext<'tcx>, item: &'tcx Item<'_>) {
         if let Some(id) = self.derived_item {
-            if item.hir_id == id {
+            if item.def_id == id {
                 self.derived_item = None;
             }
         }