remove some ancient debug output, looks unused?

compiler/rustc_hir_analysis/src/check/check.rs

@@ -505,7 +505,6 @@ fn check_static_linkage(tcx: TyCtxt<'_>, def_id: LocalDefId) {
 }
 
 pub(crate) fn check_item_type(tcx: TyCtxt<'_>, def_id: LocalDefId) {
-    let _indenter = indenter();
     match tcx.def_kind(def_id) {
         DefKind::Static { .. } => {
             tcx.ensure().typeck(def_id);

compiler/rustc_hir_analysis/src/check/mod.rs

@@ -103,7 +103,6 @@ use rustc_trait_selection::traits::ObligationCtxt;
 
 use crate::errors;
 use crate::require_c_abi_if_c_variadic;
-use crate::util::common::indenter;
 
 use self::compare_impl_item::collect_return_position_impl_trait_in_trait_tys;
 use self::region::region_scope_tree;

compiler/rustc_hir_analysis/src/lib.rs

@@ -103,7 +103,6 @@ use rustc_middle::middle;
 use rustc_middle::mir::interpret::GlobalId;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, Ty, TyCtxt};
-use rustc_middle::util;
 use rustc_session::parse::feature_err;
 use rustc_span::{symbol::sym, Span};
 use rustc_target::spec::abi::Abi;

compiler/rustc_middle/src/util/common.rs

@@ -21,21 +21,6 @@ pub fn to_readable_str(mut val: usize) -> String {
     groups.join("_")
 }
 
-pub struct Indenter {
-    _cannot_construct_outside_of_this_module: (),
-}
-
-impl Drop for Indenter {
-    fn drop(&mut self) {
-        debug!("<<");
-    }
-}
-
-pub fn indenter() -> Indenter {
-    debug!(">>");
-    Indenter { _cannot_construct_outside_of_this_module: () }
-}
-
 // const wrapper for `if let Some((_, tail)) = name.rsplit_once(':') { tail } else { name }`
 pub const fn c_name(name: &'static str) -> &'static str {
     // FIXME Simplify the implementation once more `str` methods get const-stable.