2 files changed, 1 insertions, 92 deletions
diff --git a/compiler/rustc_hir/src/intravisit.rs b/compiler/rustc_hir/src/intravisit.rs
index 977c0eb3cd2..e6d8ad1c375 100644
--- a/compiler/rustc_hir/src/intravisit.rs
+++ b/compiler/rustc_hir/src/intravisit.rs
@@ -32,43 +32,12 @@
 //! example generator inference, and possibly also HIR borrowck.
 
 use crate::hir::*;
-use crate::itemlikevisit::{ItemLikeVisitor, ParItemLikeVisitor};
+use crate::itemlikevisit::ParItemLikeVisitor;
 use rustc_ast::walk_list;
 use rustc_ast::{Attribute, Label};
 use rustc_span::symbol::{Ident, Symbol};
 use rustc_span::Span;
 
-pub struct DeepVisitor<'v, V> {
-    visitor: &'v mut V,
-}
-
-impl<'v, V> DeepVisitor<'v, V> {
-    pub fn new(base: &'v mut V) -> Self {
-        DeepVisitor { visitor: base }
-    }
-}
-
-impl<'v, 'hir, V> ItemLikeVisitor<'hir> for DeepVisitor<'v, V>
-where
-    V: Visitor<'hir>,
-{
-    fn visit_item(&mut self, item: &'hir Item<'hir>) {
-        self.visitor.visit_item(item);
-    }
-
-    fn visit_trait_item(&mut self, trait_item: &'hir TraitItem<'hir>) {
-        self.visitor.visit_trait_item(trait_item);
-    }
-
-    fn visit_impl_item(&mut self, impl_item: &'hir ImplItem<'hir>) {
-        self.visitor.visit_impl_item(impl_item);
-    }
-
-    fn visit_foreign_item(&mut self, foreign_item: &'hir ForeignItem<'hir>) {
-        self.visitor.visit_foreign_item(foreign_item);
-    }
-}
-
 pub trait IntoVisitor<'hir> {
     type Visitor: Visitor<'hir>;
     fn into_visitor(&self) -> Self::Visitor;
@@ -315,16 +284,6 @@ pub trait Visitor<'v>: Sized {
         walk_body(self, b);
     }
 
-    /// When invoking `visit_all_item_likes()`, you need to supply an
-    /// item-like visitor. This method converts an "intra-visit"
-    /// visitor into an item-like visitor that walks the entire tree.
-    /// If you use this, you probably don't want to process the
-    /// contents of nested item-like things, since the outer loop will
-    /// visit them as well.
-    fn as_deep_visitor(&mut self) -> DeepVisitor<'_, Self> {
-        DeepVisitor::new(self)
-    }
-
     ///////////////////////////////////////////////////////////////////////////
 
     fn visit_id(&mut self, _hir_id: HirId) {
diff --git a/compiler/rustc_hir/src/itemlikevisit.rs b/compiler/rustc_hir/src/itemlikevisit.rs
index b2c6ca1354f..a490268dc9f 100644
--- a/compiler/rustc_hir/src/itemlikevisit.rs
+++ b/compiler/rustc_hir/src/itemlikevisit.rs
@@ -1,55 +1,5 @@
 use super::{ForeignItem, ImplItem, Item, TraitItem};
 
-/// The "item-like visitor" defines only the top-level methods
-/// that can be invoked by `Crate::visit_all_item_likes()`. Whether
-/// this trait is the right one to implement will depend on the
-/// overall pattern you need. Here are the three available patterns,
-/// in roughly the order of desirability:
-///
-/// 1. **Shallow visit**: Get a simple callback for every item (or item-like thing) in the HIR.
-///    - Example: find all items with a `#[foo]` attribute on them.
-///    - How: Implement `ItemLikeVisitor` and call `tcx.hir().visit_all_item_likes()`.
-///    - Pro: Efficient; just walks the lists of item-like things, not the nodes themselves.
-///    - Con: Don't get information about nesting
-///    - Con: Don't have methods for specific bits of HIR, like "on
-///      every expr, do this".
-/// 2. **Deep visit**: Want to scan for specific kinds of HIR nodes within
-///    an item, but don't care about how item-like things are nested
-///    within one another.
-///    - Example: Examine each expression to look for its type and do some check or other.
-///    - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to
-///      `nested_filter::OnlyBodies` (and implement `nested_visit_map`), and use
-///      `tcx.hir().visit_all_item_likes(&mut visitor.as_deep_visitor())`. Within your
-///      `intravisit::Visitor` impl, implement methods like `visit_expr()` (don't forget to invoke
-///      `intravisit::walk_expr()` to keep walking the subparts).
-///    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
-///    - Pro: Integrates well into dependency tracking.
-///    - Con: Don't get information about nesting between items
-/// 3. **Nested visit**: Want to visit the whole HIR and you care about the nesting between
-///    item-like things.
-///    - Example: Lifetime resolution, which wants to bring lifetimes declared on the
-///      impl into scope while visiting the impl-items, and then back out again.
-///    - How: Implement `intravisit::Visitor` and override the `NestedFilter` type to
-///      `nested_filter::All` (and implement `nested_visit_map`). Walk your crate with
-///      `tcx.hir().walk_toplevel_module(visitor)` invoked on `tcx.hir().krate()`.
-///    - Pro: Visitor methods for any kind of HIR node, not just item-like things.
-///    - Pro: Preserves nesting information
-///    - Con: Does not integrate well into dependency tracking.
-///
-/// Note: the methods of `ItemLikeVisitor` intentionally have no
-/// defaults, so that as we expand the list of item-like things, we
-/// revisit the various visitors to see if they need to change. This
-/// is harder to do with `intravisit::Visitor`, so when you add a new
-/// `visit_nested_foo()` method, it is recommended that you search for
-/// existing `fn visit_nested` methods to see where changes are
-/// needed.
-pub trait ItemLikeVisitor<'hir> {
-    fn visit_item(&mut self, item: &'hir Item<'hir>);
-    fn visit_trait_item(&mut self, trait_item: &'hir TraitItem<'hir>);
-    fn visit_impl_item(&mut self, impl_item: &'hir ImplItem<'hir>);
-    fn visit_foreign_item(&mut self, foreign_item: &'hir ForeignItem<'hir>);
-}
-
 /// A parallel variant of `ItemLikeVisitor`.
 pub trait ParItemLikeVisitor<'hir> {
     fn visit_item(&self, item: &'hir Item<'hir>);