Remove #[macro_use] extern crate tracing from rustc_infer.

Author: nnethercote

compiler/rustc_infer/src/infer/canonical/canonicalizer.rs

@@ -13,6 +13,7 @@ use rustc_middle::ty::{
     self, BoundVar, GenericArg, InferConst, List, Ty, TyCtxt, TypeFlags, TypeVisitableExt,
 };
 use smallvec::SmallVec;
+use tracing::debug;
 
 use crate::infer::canonical::{
     Canonical, CanonicalTyVarKind, CanonicalVarInfo, CanonicalVarKind, OriginalQueryValues,

compiler/rustc_infer/src/infer/canonical/query_response.rs

@@ -17,6 +17,7 @@ use rustc_middle::mir::ConstraintCategory;
 use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::{self, BoundVar, GenericArg, GenericArgKind, Ty, TyCtxt};
 use rustc_middle::{bug, span_bug};
+use tracing::{debug, instrument};
 
 use crate::infer::canonical::instantiate::{instantiate_value, CanonicalExt};
 use crate::infer::canonical::{

compiler/rustc_infer/src/infer/free_regions.rs

@@ -5,6 +5,7 @@
 
 use rustc_data_structures::transitive_relation::TransitiveRelation;
 use rustc_middle::ty::{Region, TyCtxt};
+use tracing::debug;
 
 /// Combines a `FreeRegionMap` and a `TyCtxt`.
 ///

compiler/rustc_infer/src/infer/lexical_region_resolve/mod.rs

@@ -16,6 +16,7 @@ use rustc_middle::ty::{
 };
 use rustc_middle::{bug, span_bug};
 use rustc_span::Span;
+use tracing::{debug, instrument};
 
 use super::outlives::test_type_match;
 use crate::infer::region_constraints::{

compiler/rustc_infer/src/infer/mod.rs

@@ -44,6 +44,7 @@ use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::Symbol;
 use rustc_span::Span;
 use snapshot::undo_log::InferCtxtUndoLogs;
+use tracing::{debug, instrument};
 use type_variable::TypeVariableOrigin;
 pub use BoundRegionConversionTime::*;
 pub use RegionVariableOrigin::*;

compiler/rustc_infer/src/infer/opaque_types/mod.rs

@@ -11,6 +11,7 @@ use rustc_middle::ty::{
     TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor,
 };
 use rustc_span::Span;
+use tracing::{debug, instrument};
 
 use crate::errors::OpaqueHiddenTypeDiag;
 use crate::infer::{InferCtxt, InferOk};

compiler/rustc_infer/src/infer/opaque_types/table.rs

@@ -1,6 +1,7 @@
 use rustc_data_structures::undo_log::UndoLogs;
 use rustc_middle::bug;
 use rustc_middle::ty::{self, OpaqueHiddenType, OpaqueTypeKey, Ty};
+use tracing::instrument;
 
 use super::{OpaqueTypeDecl, OpaqueTypeMap};
 use crate::infer::snapshot::undo_log::{InferCtxtUndoLogs, UndoLog};

compiler/rustc_infer/src/infer/outlives/env.rs

@@ -2,6 +2,7 @@ use rustc_data_structures::fx::FxIndexSet;
 use rustc_data_structures::transitive_relation::TransitiveRelationBuilder;
 use rustc_middle::bug;
 use rustc_middle::ty::{self, Region};
+use tracing::{debug, instrument};
 
 use super::explicit_outlives_bounds;
 use crate::infer::free_regions::FreeRegionMap;

compiler/rustc_infer/src/infer/outlives/mod.rs

@@ -2,6 +2,7 @@
 
 use rustc_middle::traits::query::{NoSolution, OutlivesBound};
 use rustc_middle::ty;
+use tracing::instrument;
 
 use self::env::OutlivesEnvironment;
 use super::region_constraints::RegionConstraintData;

compiler/rustc_infer/src/infer/outlives/obligations.rs

@@ -70,6 +70,7 @@ use rustc_middle::ty::{
 use rustc_span::DUMMY_SP;
 use rustc_type_ir::outlives::{push_outlives_components, Component};
 use smallvec::smallvec;
+use tracing::{debug, instrument};
 
 use super::env::OutlivesEnvironment;
 use crate::infer::outlives::env::RegionBoundPairs;