From 4798c20d31843b49bf3a5e891c1a3534f007ce61 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Thu, 30 May 2024 10:51:11 +1000
Subject: [PATCH] Streamline `nested` calls.

`TyCtxt` impls `PpAnn` in `compiler/rustc_middle/src/hir/map/mod.rs`. We
can call that impl, which then calls the one on `intravisit::Map`,
instead of calling the one on `intravisit::Map` directly, avoiding a
cast and extra references.
---
 compiler/rustc_driver_impl/src/pretty.rs | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/compiler/rustc_driver_impl/src/pretty.rs b/compiler/rustc_driver_impl/src/pretty.rs
index 8acba57b7a6..31de0a747b2 100644
--- a/compiler/rustc_driver_impl/src/pretty.rs
+++ b/compiler/rustc_driver_impl/src/pretty.rs
@@ -3,7 +3,6 @@
 use rustc_ast as ast;
 use rustc_ast_pretty::pprust as pprust_ast;
 use rustc_errors::FatalError;
-use rustc_hir as hir;
 use rustc_hir_pretty as pprust_hir;
 use rustc_middle::bug;
 use rustc_middle::mir::{write_mir_graphviz, write_mir_pretty};
@@ -70,11 +69,7 @@ struct HirIdentifiedAnn<'tcx> {
 
 impl<'tcx> pprust_hir::PpAnn for HirIdentifiedAnn<'tcx> {
     fn nested(&self, state: &mut pprust_hir::State<'_>, nested: pprust_hir::Nested) {
-        pprust_hir::PpAnn::nested(
-            &(&self.tcx.hir() as &dyn hir::intravisit::Map<'_>),
-            state,
-            nested,
-        )
+        self.tcx.nested(state, nested)
     }
 
     fn pre(&self, s: &mut pprust_hir::State<'_>, node: pprust_hir::AnnNode<'_>) {
@@ -152,8 +147,7 @@ fn nested(&self, state: &mut pprust_hir::State<'_>, nested: pprust_hir::Nested)
         if let pprust_hir::Nested::Body(id) = nested {
             self.maybe_typeck_results.set(Some(self.tcx.typeck_body(id)));
         }
-        let pp_ann = &(&self.tcx.hir() as &dyn hir::intravisit::Map<'_>);
-        pprust_hir::PpAnn::nested(pp_ann, state, nested);
+        self.tcx.nested(state, nested);
         self.maybe_typeck_results.set(old_maybe_typeck_results);
     }