Remove #[macro_use] extern crate tracing from rustc_monomorphize.

Author: nnethercote

compiler/rustc_monomorphize/src/collector.rs

@@ -236,6 +236,7 @@ use rustc_span::symbol::{sym, Ident};
 use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::Size;
 use std::path::PathBuf;
+use tracing::{debug, instrument, trace};
 
 use crate::errors::{
     self, EncounteredErrorWhileInstantiating, NoOptimizedMir, RecursionLimit, TypeLengthLimit,

compiler/rustc_monomorphize/src/collector/move_check.rs

@@ -1,4 +1,5 @@
 use rustc_session::lint::builtin::LARGE_ASSIGNMENTS;
+use tracing::debug;
 
 use super::*;
 use crate::errors::LargeAssignmentsLint;

compiler/rustc_monomorphize/src/lib.rs

@@ -2,9 +2,6 @@
 #![feature(is_sorted)]
 #![allow(rustc::potential_query_instability)]
 
-#[macro_use]
-extern crate tracing;
-
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::bug;
 use rustc_middle::query::{Providers, TyCtxtAt};

compiler/rustc_monomorphize/src/partitioning.rs

@@ -116,6 +116,7 @@ use rustc_middle::ty::{self, visit::TypeVisitableExt, InstanceDef, TyCtxt};
 use rustc_session::config::{DumpMonoStatsFormat, SwitchWithOptPath};
 use rustc_session::CodegenUnits;
 use rustc_span::symbol::Symbol;
+use tracing::debug;
 
 use crate::collector::UsageMap;
 use crate::collector::{self, MonoItemCollectionStrategy};

compiler/rustc_monomorphize/src/polymorphize.rs

@@ -18,6 +18,7 @@ use rustc_middle::ty::{
     GenericArgsRef, Ty, TyCtxt, UnusedGenericParams,
 };
 use rustc_span::symbol::sym;
+use tracing::{debug, instrument};
 
 use crate::errors::UnusedGenericParamsHint;