Remove #[macro_use] extern crate tracing from rustc_mir_dataflow.

Author: nnethercote

compiler/rustc_mir_dataflow/src/drop_flag_effects.rs

@@ -1,6 +1,7 @@
 use crate::elaborate_drops::DropFlagState;
 use rustc_middle::mir::{self, Body, Location, Terminator, TerminatorKind};
 use rustc_target::abi::VariantIdx;
+use tracing::debug;
 
 use super::move_paths::{InitKind, LookupResult, MoveData, MovePathIndex};
 use super::MoveDataParamEnv;

compiler/rustc_mir_dataflow/src/elaborate_drops.rs

@@ -11,6 +11,7 @@ use rustc_span::source_map::Spanned;
 use rustc_span::DUMMY_SP;
 use rustc_target::abi::{FieldIdx, VariantIdx, FIRST_VARIANT};
 use std::{fmt, iter};
+use tracing::{debug, instrument};
 
 /// The value of an inserted drop flag.
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]

compiler/rustc_mir_dataflow/src/framework/engine.rs

@@ -19,6 +19,7 @@ use rustc_middle::mir::{create_dump_file, dump_enabled};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::symbol::{sym, Symbol};
+use tracing::{debug, error};
 
 use super::fmt::DebugWithContext;
 use super::graphviz;

compiler/rustc_mir_dataflow/src/impls/initialized.rs

@@ -3,6 +3,7 @@ use rustc_index::Idx;
 use rustc_middle::bug;
 use rustc_middle::mir::{self, Body, CallReturnPlaces, Location, TerminatorEdges};
 use rustc_middle::ty::{self, TyCtxt};
+use tracing::{debug, instrument};
 
 use crate::drop_flag_effects_for_function_entry;
 use crate::drop_flag_effects_for_location;

compiler/rustc_mir_dataflow/src/lib.rs

@@ -4,9 +4,6 @@
 #![feature(let_chains)]
 #![feature(try_blocks)]
 
-#[macro_use]
-extern crate tracing;
-
 use rustc_middle::ty;
 
 // Please change the public `use` directives cautiously, as they might be used by external tools.

compiler/rustc_mir_dataflow/src/move_paths/builder.rs

@@ -4,6 +4,7 @@ use rustc_middle::mir::*;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
 use rustc_middle::{bug, span_bug};
 use smallvec::{smallvec, SmallVec};
+use tracing::debug;
 
 use std::mem;
 

compiler/rustc_mir_dataflow/src/rustc_peek.rs

@@ -18,6 +18,7 @@ use rustc_middle::mir::{self, Body, Local, Location};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::Span;
+use tracing::{debug, info};
 
 pub struct SanityCheck;
 

compiler/rustc_mir_dataflow/src/value_analysis.rs

@@ -45,6 +45,7 @@ use rustc_middle::mir::visit::{MutatingUseContext, PlaceContext, Visitor};
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_target::abi::{FieldIdx, VariantIdx};
+use tracing::debug;
 
 use crate::lattice::{HasBottom, HasTop};
 use crate::{