Auto merge of #62099 - Mark-Simulacrum:syntax-print-clean-2, r=eddyb

Remove io::Result from syntax::print Since we're now writing directly to the vector, there's no need to thread results through the whole printing infrastructure

Author: bors

src/librustc/hir/map/mod.rs

@@ -25,7 +25,6 @@ use crate::hir::print::Nested;
 use crate::util::nodemap::FxHashMap;
 use crate::util::common::time;
 
-use std::io;
 use std::result::Result::Err;
 use crate::ty::query::Providers;
 
@@ -1187,7 +1186,7 @@ pub fn map_crate<'hir>(sess: &crate::session::Session,
 /// Identical to the `PpAnn` implementation for `hir::Crate`,
 /// except it avoids creating a dependency on the whole crate.
 impl<'hir> print::PpAnn for Map<'hir> {
- fn nested(&self, state: &mut print::State<'_>, nested: print::Nested) -> io::Result<()> {
+ fn nested(&self, state: &mut print::State<'_>, nested: print::Nested) {
  match nested {
  Nested::Item(id) => state.print_item(self.expect_item(id.id)),
  Nested::TraitItem(id) => state.print_trait_item(self.trait_item(id)),
@@ -1199,7 +1198,7 @@ impl<'hir> print::PpAnn for Map<'hir> {
 }
 
 impl<'a> print::State<'a> {
- pub fn print_node(&mut self, node: Node<'_>) -> io::Result<()> {
+ pub fn print_node(&mut self, node: Node<'_>) {
  match node {
  Node::Item(a) => self.print_item(&a),
  Node::ForeignItem(a) => self.print_foreign_item(&a),
@@ -1219,9 +1218,9 @@ impl<'a> print::State<'a> {
  use syntax::print::pprust::PrintState;
 
  // containing cbox, will be closed by print-block at }
- self.cbox(print::indent_unit)?;
+ self.cbox(print::indent_unit);
  // head-ibox, will be closed by print-block after {
- self.ibox(0)?;
+ self.ibox(0);
  self.print_block(&a)
  }
  Node::Lifetime(a) => self.print_lifetime(&a),