Track HirId when visiting attributes.

compiler/rustc_hir/src/intravisit.rs

@@ -458,7 +458,7 @@ pub trait Visitor<'v>: Sized {
     fn visit_assoc_type_binding(&mut self, type_binding: &'v TypeBinding<'v>) {
         walk_assoc_type_binding(self, type_binding)
     }
-    fn visit_attribute(&mut self, _attr: &'v Attribute) {}
+    fn visit_attribute(&mut self, _id: HirId, _attr: &'v Attribute) {}
     fn visit_macro_def(&mut self, macro_def: &'v MacroDef<'v>) {
         walk_macro_def(self, macro_def)
     }
@@ -477,8 +477,10 @@ pub trait Visitor<'v>: Sized {
 pub fn walk_crate<'v, V: Visitor<'v>>(visitor: &mut V, krate: &'v Crate<'v>) {
     visitor.visit_mod(&krate.item.module, krate.item.span, CRATE_HIR_ID);
     walk_list!(visitor, visit_macro_def, krate.exported_macros);
-    for attr in krate.attrs.iter().flat_map(|l| *l) {
-        visitor.visit_attribute(attr)
+    for (id, attrs) in krate.attrs.iter_enumerated() {
+        for a in *attrs {
+            visitor.visit_attribute(id, a)
+        }
     }
 }
 

compiler/rustc_incremental/src/persist/dirty_clean.rs

@@ -554,7 +554,7 @@ impl intravisit::Visitor<'tcx> for FindAllAttrs<'_, 'tcx> {
         intravisit::NestedVisitorMap::All(self.tcx.hir())
     }
 
-    fn visit_attribute(&mut self, attr: &'tcx Attribute) {
+    fn visit_attribute(&mut self, _: hir::HirId, attr: &'tcx Attribute) {
         if self.is_active_attr(attr) {
             self.found_attrs.push(attr);
         }

compiler/rustc_lint/src/late.rs

@@ -16,7 +16,6 @@
 
 use crate::{passes::LateLintPassObject, LateContext, LateLintPass, LintStore};
 use rustc_ast as ast;
-use rustc_ast::walk_list;
 use rustc_data_structures::sync::{join, par_iter, ParallelIterator};
 use rustc_hir as hir;
 use rustc_hir::def_id::{LocalDefId, LOCAL_CRATE};
@@ -333,8 +332,10 @@ impl<'tcx, T: LateLintPass<'tcx>> hir_visit::Visitor<'tcx> for LateContextAndPas
         hir_visit::walk_path(self, p);
     }
 
-    fn visit_attribute(&mut self, attr: &'tcx ast::Attribute) {
-        lint_callback!(self, check_attribute, attr);
+    fn visit_attribute(&mut self, hir_id: hir::HirId, attr: &'tcx ast::Attribute) {
+        self.with_lint_attrs(hir_id, |cx| {
+            lint_callback!(cx, check_attribute, attr);
+        })
     }
 }
 
@@ -395,7 +396,9 @@ fn late_lint_mod_pass<'tcx, T: LateLintPass<'tcx>>(
 
     // Visit the crate attributes
     if hir_id == hir::CRATE_HIR_ID {
-        walk_list!(cx, visit_attribute, tcx.hir().attrs(hir::CRATE_HIR_ID));
+        for attr in tcx.hir().attrs(hir::CRATE_HIR_ID).iter() {
+            cx.visit_attribute(hir_id, attr)
+        }
     }
 }
 

compiler/rustc_passes/src/hir_stats.rs

@@ -241,7 +241,7 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
         hir_visit::walk_assoc_type_binding(self, type_binding)
     }
 
-    fn visit_attribute(&mut self, attr: &'v ast::Attribute) {
+    fn visit_attribute(&mut self, _: hir::HirId, attr: &'v ast::Attribute) {
         self.record("Attribute", Id::Attr(attr.id), attr);
     }
 

compiler/rustc_passes/src/lib_features.rs

@@ -120,7 +120,7 @@ impl Visitor<'tcx> for LibFeatureCollector<'tcx> {
         NestedVisitorMap::All(self.tcx.hir())
     }
 
-    fn visit_attribute(&mut self, attr: &'tcx Attribute) {
+    fn visit_attribute(&mut self, _: rustc_hir::HirId, attr: &'tcx Attribute) {
         if let Some((feature, stable, span)) = self.extract(attr) {
             self.collect_feature(feature, stable, span);
         }
@@ -131,7 +131,7 @@ fn collect(tcx: TyCtxt<'_>) -> LibFeatures {
     let mut collector = LibFeatureCollector::new(tcx);
     let krate = tcx.hir().krate();
     for attr in krate.non_exported_macro_attrs {
-        collector.visit_attribute(attr);
+        collector.visit_attribute(rustc_hir::CRATE_HIR_ID, attr);
     }
     intravisit::walk_crate(&mut collector, krate);
     collector.lib_features