Remove #[macro_use] extern crate tracing from rustc_mir_transform.

Author: nnethercote

compiler/rustc_mir_transform/src/add_call_guards.rs

@@ -1,6 +1,7 @@
 use rustc_index::{Idx, IndexVec};
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
+use tracing::debug;
 
 #[derive(PartialEq)]
 pub enum AddCallGuards {

compiler/rustc_mir_transform/src/add_moves_for_packed_drops.rs

@@ -1,6 +1,7 @@
 use rustc_middle::mir::patch::MirPatch;
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
+use tracing::debug;
 
 use crate::util;
 

compiler/rustc_mir_transform/src/check_alignment.rs

@@ -5,6 +5,7 @@ use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceC
 use rustc_middle::mir::*;
 use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt};
 use rustc_session::Session;
+use tracing::{debug, trace};
 
 pub struct CheckAlignment;
 

compiler/rustc_mir_transform/src/copy_prop.rs

@@ -3,6 +3,7 @@ use rustc_index::IndexSlice;
 use rustc_middle::mir::visit::*;
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
+use tracing::{debug, instrument};
 
 use crate::ssa::SsaLocals;
 

compiler/rustc_mir_transform/src/coroutine.rs

@@ -78,6 +78,7 @@ use rustc_target::spec::PanicStrategy;
 use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
 use rustc_trait_selection::infer::TyCtxtInferExt as _;
 use rustc_trait_selection::traits::{ObligationCause, ObligationCauseCode, ObligationCtxt};
+use tracing::{debug, instrument, trace};
 
 use crate::deref_separator::deref_finder;
 use crate::{abort_unwinding_calls, errors, pass_manager as pm, simplify};

compiler/rustc_mir_transform/src/coverage/counters.rs

@@ -6,6 +6,7 @@ use rustc_data_structures::graph::DirectedGraph;
 use rustc_index::IndexVec;
 use rustc_middle::bug;
 use rustc_middle::mir::coverage::{CounterId, CovTerm, Expression, ExpressionId, Op};
+use tracing::{debug, debug_span, instrument};
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph, TraverseCoverageGraphWithLoops};
 

compiler/rustc_mir_transform/src/coverage/graph.rs

@@ -10,6 +10,7 @@ use rustc_index::bit_set::BitSet;
 use rustc_index::IndexVec;
 use rustc_middle::bug;
 use rustc_middle::mir::{self, BasicBlock, Terminator, TerminatorKind};
+use tracing::debug;
 
 /// A coverage-specific simplification of the MIR control flow graph (CFG). The `CoverageGraph`s
 /// nodes are `BasicCoverageBlock`s, which encompass one or more MIR `BasicBlock`s.

compiler/rustc_mir_transform/src/coverage/mod.rs

@@ -23,6 +23,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::def_id::LocalDefId;
 use rustc_span::source_map::SourceMap;
 use rustc_span::{BytePos, Pos, RelativeBytePos, Span, Symbol};
+use tracing::{debug, debug_span, trace};
 
 use crate::coverage::counters::{CounterIncrementSite, CoverageCounters};
 use crate::coverage::graph::CoverageGraph;

compiler/rustc_mir_transform/src/coverage/query.rs

@@ -7,6 +7,7 @@ use rustc_middle::ty::{self, TyCtxt};
 use rustc_middle::util::Providers;
 use rustc_span::def_id::LocalDefId;
 use rustc_span::sym;
+use tracing::trace;
 
 /// Registers query/hook implementations related to coverage.
 pub(crate) fn provide(providers: &mut Providers) {

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -4,6 +4,7 @@ use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::mir;
 use rustc_span::Span;
+use tracing::{debug, debug_span, instrument};
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
 use crate::coverage::spans::from_mir::{