From cc16c902f13c6ba0f191eb6cc151a4b5e009eace Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Fri, 30 Aug 2024 09:02:58 +1000
Subject: [PATCH] Remove `#[macro_use] extern crate tracing` from
 `rustc_hir_analysis`.

---
 compiler/rustc_hir_analysis/src/autoderef.rs                   | 1 +
 compiler/rustc_hir_analysis/src/check/check.rs                 | 1 +
 compiler/rustc_hir_analysis/src/check/compare_impl_item.rs     | 1 +
 compiler/rustc_hir_analysis/src/check/mod.rs                   | 1 +
 compiler/rustc_hir_analysis/src/check/region.rs                | 1 +
 compiler/rustc_hir_analysis/src/check/wfcheck.rs               | 1 +
 compiler/rustc_hir_analysis/src/check_unused.rs                | 1 +
 compiler/rustc_hir_analysis/src/coherence/builtin.rs           | 1 +
 .../rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs | 1 +
 compiler/rustc_hir_analysis/src/coherence/mod.rs               | 1 +
 compiler/rustc_hir_analysis/src/coherence/orphan.rs            | 1 +
 compiler/rustc_hir_analysis/src/collect.rs                     | 1 +
 compiler/rustc_hir_analysis/src/collect/generics_of.rs         | 1 +
 compiler/rustc_hir_analysis/src/collect/item_bounds.rs         | 1 +
 compiler/rustc_hir_analysis/src/collect/predicates_of.rs       | 1 +
 compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs  | 1 +
 compiler/rustc_hir_analysis/src/collect/type_of.rs             | 1 +
 compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs      | 1 +
 compiler/rustc_hir_analysis/src/constrained_generic_params.rs  | 1 +
 .../src/errors/wrong_number_of_generic_args.rs                 | 1 +
 compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs      | 1 +
 compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs    | 1 +
 compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs         | 1 +
 .../rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs    | 1 +
 compiler/rustc_hir_analysis/src/hir_wf_check.rs                | 1 +
 .../rustc_hir_analysis/src/impl_wf_check/min_specialization.rs | 1 +
 compiler/rustc_hir_analysis/src/lib.rs                         | 3 ---
 compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs     | 1 +
 compiler/rustc_hir_analysis/src/variance/constraints.rs        | 1 +
 compiler/rustc_hir_analysis/src/variance/mod.rs                | 1 +
 compiler/rustc_hir_analysis/src/variance/solve.rs              | 1 +
 compiler/rustc_hir_analysis/src/variance/terms.rs              | 1 +
 32 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/compiler/rustc_hir_analysis/src/autoderef.rs b/compiler/rustc_hir_analysis/src/autoderef.rs
index 53c8586b52a..46a0d4f498a 100644
--- a/compiler/rustc_hir_analysis/src/autoderef.rs
+++ b/compiler/rustc_hir_analysis/src/autoderef.rs
@@ -4,6 +4,7 @@
 use rustc_span::def_id::{LocalDefId, LOCAL_CRATE};
 use rustc_span::Span;
 use rustc_trait_selection::traits::ObligationCtxt;
+use tracing::{debug, instrument};
 
 use crate::errors::AutoDerefReachedRecursionLimit;
 use crate::traits;
diff --git a/compiler/rustc_hir_analysis/src/check/check.rs b/compiler/rustc_hir_analysis/src/check/check.rs
index d414bcdb95b..e47c707ee18 100644
--- a/compiler/rustc_hir_analysis/src/check/check.rs
+++ b/compiler/rustc_hir_analysis/src/check/check.rs
@@ -27,6 +27,7 @@
 use rustc_trait_selection::traits;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
 use rustc_type_ir::fold::TypeFoldable;
+use tracing::{debug, instrument};
 use {rustc_attr as attr, rustc_hir as hir};
 
 use super::compare_impl_item::{check_type_bounds, compare_impl_method, compare_impl_ty};
diff --git a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
index 35577613800..2afed04c5bc 100644
--- a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
+++ b/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs
@@ -28,6 +28,7 @@
 use rustc_trait_selection::traits::{
     self, FulfillmentError, ObligationCause, ObligationCauseCode, ObligationCtxt, Reveal,
 };
+use tracing::{debug, instrument};
 
 use super::potentially_plural_count;
 use crate::errors::{LifetimesOrBoundsMismatchOnTrait, MethodShouldReturnFuture};
diff --git a/compiler/rustc_hir_analysis/src/check/mod.rs b/compiler/rustc_hir_analysis/src/check/mod.rs
index 678b8c89a50..6820a44f141 100644
--- a/compiler/rustc_hir_analysis/src/check/mod.rs
+++ b/compiler/rustc_hir_analysis/src/check/mod.rs
@@ -97,6 +97,7 @@
 use rustc_trait_selection::error_reporting::traits::suggestions::ReturnsVisitor;
 use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
 use rustc_trait_selection::traits::ObligationCtxt;
+use tracing::debug;
 
 use self::compare_impl_item::collect_return_position_impl_trait_in_trait_tys;
 use self::region::region_scope_tree;
diff --git a/compiler/rustc_hir_analysis/src/check/region.rs b/compiler/rustc_hir_analysis/src/check/region.rs
index 48335173979..2d6147cff2a 100644
--- a/compiler/rustc_hir_analysis/src/check/region.rs
+++ b/compiler/rustc_hir_analysis/src/check/region.rs
@@ -18,6 +18,7 @@
 use rustc_middle::middle::region::*;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::source_map;
+use tracing::debug;
 
 use super::errs::{maybe_expr_static_mut, maybe_stmt_static_mut};
 
diff --git a/compiler/rustc_hir_analysis/src/check/wfcheck.rs b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
index cb66179ec80..359b4729e50 100644
--- a/compiler/rustc_hir_analysis/src/check/wfcheck.rs
+++ b/compiler/rustc_hir_analysis/src/check/wfcheck.rs
@@ -36,6 +36,7 @@
 };
 use rustc_type_ir::solve::NoSolution;
 use rustc_type_ir::TypeFlags;
+use tracing::{debug, instrument};
 use {rustc_ast as ast, rustc_hir as hir};
 
 use crate::autoderef::Autoderef;
diff --git a/compiler/rustc_hir_analysis/src/check_unused.rs b/compiler/rustc_hir_analysis/src/check_unused.rs
index ca9e2e8a3cc..68b7b44c36d 100644
--- a/compiler/rustc_hir_analysis/src/check_unused.rs
+++ b/compiler/rustc_hir_analysis/src/check_unused.rs
@@ -4,6 +4,7 @@
 use rustc_middle::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint;
+use tracing::debug;
 
 pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers { check_unused_traits, ..*providers };
diff --git a/compiler/rustc_hir_analysis/src/coherence/builtin.rs b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
index 23f1adfe302..9f01f7be80a 100644
--- a/compiler/rustc_hir_analysis/src/coherence/builtin.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
@@ -23,6 +23,7 @@
     ConstParamTyImplementationError, CopyImplementationError, InfringingFieldsReason,
 };
 use rustc_trait_selection::traits::{self, ObligationCause, ObligationCtxt};
+use tracing::debug;
 
 use crate::errors;
 
diff --git a/compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs b/compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs
index 00bbbf7130f..6825c2e33fe 100644
--- a/compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/inherent_impls_overlap.rs
@@ -10,6 +10,7 @@
 use rustc_span::{ErrorGuaranteed, Symbol};
 use rustc_trait_selection::traits::{self, SkipLeakCheck};
 use smallvec::SmallVec;
+use tracing::debug;
 
 pub(crate) fn crate_inherent_impls_overlap_check(
     tcx: TyCtxt<'_>,
diff --git a/compiler/rustc_hir_analysis/src/coherence/mod.rs b/compiler/rustc_hir_analysis/src/coherence/mod.rs
index 3d800bb165c..db809e4837d 100644
--- a/compiler/rustc_hir_analysis/src/coherence/mod.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/mod.rs
@@ -13,6 +13,7 @@
 use rustc_middle::ty::{self, TyCtxt, TypeVisitableExt};
 use rustc_session::parse::feature_err;
 use rustc_span::{sym, ErrorGuaranteed};
+use tracing::debug;
 
 use crate::errors;
 
diff --git a/compiler/rustc_hir_analysis/src/coherence/orphan.rs b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
index dcd0e3111a4..5fdaba41fb2 100644
--- a/compiler/rustc_hir_analysis/src/coherence/orphan.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
@@ -14,6 +14,7 @@
 use rustc_trait_selection::traits::{
     self, IsFirstInputType, OrphanCheckErr, OrphanCheckMode, UncoveredTyParams,
 };
+use tracing::{debug, instrument};
 
 use crate::errors;
 
diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index 3acf2c63145..bf8f5721ad2 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -42,6 +42,7 @@
 use rustc_trait_selection::error_reporting::traits::suggestions::NextTypeParamName;
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::ObligationCtxt;
+use tracing::{debug, instrument};
 
 use crate::check::intrinsic::intrinsic_operation_unsafety;
 use crate::errors;
diff --git a/compiler/rustc_hir_analysis/src/collect/generics_of.rs b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
index 28d6cab4b43..be6c3f048dc 100644
--- a/compiler/rustc_hir_analysis/src/collect/generics_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/generics_of.rs
@@ -10,6 +10,7 @@
 use rustc_session::lint;
 use rustc_span::symbol::{kw, Symbol};
 use rustc_span::Span;
+use tracing::{debug, instrument};
 
 use crate::delegation::inherit_generics_for_delegation_item;
 use crate::middle::resolve_bound_vars as rbv;
diff --git a/compiler/rustc_hir_analysis/src/collect/item_bounds.rs b/compiler/rustc_hir_analysis/src/collect/item_bounds.rs
index ec48c781c0e..d62727e76b5 100644
--- a/compiler/rustc_hir_analysis/src/collect/item_bounds.rs
+++ b/compiler/rustc_hir_analysis/src/collect/item_bounds.rs
@@ -8,6 +8,7 @@
 use rustc_span::def_id::{DefId, LocalDefId};
 use rustc_span::Span;
 use rustc_type_ir::Upcast;
+use tracing::{debug, instrument};
 
 use super::ItemCtxt;
 use crate::hir_ty_lowering::{HirTyLowerer, PredicateFilter};
diff --git a/compiler/rustc_hir_analysis/src/collect/predicates_of.rs b/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
index bba8b0497be..fcc281cc7ee 100644
--- a/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/predicates_of.rs
@@ -10,6 +10,7 @@
 use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::Ident;
 use rustc_span::{Span, DUMMY_SP};
+use tracing::{debug, instrument, trace};
 
 use crate::bounds::Bounds;
 use crate::collect::ItemCtxt;
diff --git a/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs b/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
index e38492d9e64..af4aa7a7d8d 100644
--- a/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
+++ b/compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
@@ -24,6 +24,7 @@
 use rustc_span::def_id::{DefId, LocalDefId};
 use rustc_span::symbol::{sym, Ident};
 use rustc_span::Span;
+use tracing::{debug, debug_span, instrument};
 
 use crate::errors;
 
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of.rs b/compiler/rustc_hir_analysis/src/collect/type_of.rs
index 96256b91b9f..5cb90e97eef 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of.rs
@@ -11,6 +11,7 @@
 use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::Ident;
 use rustc_span::{Span, DUMMY_SP};
+use tracing::debug;
 
 use super::{bad_placeholder, ItemCtxt};
 use crate::errors::TypeofReservedKeywordUsed;
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs b/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs
index c8b0f03a929..7f4a8208faa 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of/opaque.rs
@@ -7,6 +7,7 @@
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
 use rustc_span::DUMMY_SP;
+use tracing::{debug, instrument, trace};
 
 use crate::errors::{TaitForwardCompat, TaitForwardCompat2, UnconstrainedOpaqueType};
 
diff --git a/compiler/rustc_hir_analysis/src/constrained_generic_params.rs b/compiler/rustc_hir_analysis/src/constrained_generic_params.rs
index edf65245664..6a9ae0de1c1 100644
--- a/compiler/rustc_hir_analysis/src/constrained_generic_params.rs
+++ b/compiler/rustc_hir_analysis/src/constrained_generic_params.rs
@@ -4,6 +4,7 @@
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::Span;
 use rustc_type_ir::fold::TypeFoldable;
+use tracing::debug;
 
 #[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub(crate) struct Parameter(pub u32);
diff --git a/compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs b/compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs
index f8b2469dfea..da89f5769d1 100644
--- a/compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs
+++ b/compiler/rustc_hir_analysis/src/errors/wrong_number_of_generic_args.rs
@@ -5,6 +5,7 @@
 use rustc_hir as hir;
 use rustc_middle::ty::{self as ty, AssocItems, AssocKind, TyCtxt};
 use rustc_span::def_id::DefId;
+use tracing::debug;
 use GenericArgsInfo::*;
 
 /// Handles the `wrong number of type / lifetime / ... arguments` family of error messages.
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
index 7f4c75d3a6a..70a3c744c78 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
@@ -13,6 +13,7 @@
 use rustc_trait_selection::traits;
 use rustc_type_ir::visit::{TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor};
 use smallvec::SmallVec;
+use tracing::{debug, instrument};
 
 use crate::bounds::Bounds;
 use crate::errors;
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
index a59e9aa85fd..8d5f98c7372 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs
@@ -11,6 +11,7 @@
 use rustc_session::lint::builtin::LATE_BOUND_LIFETIME_ARGUMENTS;
 use rustc_span::symbol::{kw, sym};
 use smallvec::SmallVec;
+use tracing::{debug, instrument};
 
 use super::{HirTyLowerer, IsMethodCall};
 use crate::errors::wrong_number_of_generic_args::{GenericArgsInfo, WrongNumberOfGenericArgs};
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
index 0cdd3e4a1c6..f955e08dd5f 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
@@ -50,6 +50,7 @@
 use rustc_trait_selection::infer::InferCtxtExt;
 use rustc_trait_selection::traits::wf::object_region_bounds;
 use rustc_trait_selection::traits::{self, ObligationCtxt};
+use tracing::{debug, debug_span, instrument};
 
 use crate::bounds::Bounds;
 use crate::errors::{AmbiguousLifetimeBound, WildPatTy};
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs
index 52e167379b5..88538863710 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/object_safety.rs
@@ -14,6 +14,7 @@
 use rustc_trait_selection::error_reporting::traits::report_object_safety_error;
 use rustc_trait_selection::traits::{self, hir_ty_lowering_object_safety_violations};
 use smallvec::{smallvec, SmallVec};
+use tracing::{debug, instrument};
 
 use super::HirTyLowerer;
 use crate::bounds::Bounds;
diff --git a/compiler/rustc_hir_analysis/src/hir_wf_check.rs b/compiler/rustc_hir_analysis/src/hir_wf_check.rs
index 3ecf61501f6..2fa4ca68073 100644
--- a/compiler/rustc_hir_analysis/src/hir_wf_check.rs
+++ b/compiler/rustc_hir_analysis/src/hir_wf_check.rs
@@ -8,6 +8,7 @@
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::def_id::LocalDefId;
 use rustc_trait_selection::traits::{self, ObligationCtxt};
+use tracing::debug;
 
 use crate::collect::ItemCtxt;
 
diff --git a/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs b/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
index f44a78bac4d..147646930dd 100644
--- a/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
+++ b/compiler/rustc_hir_analysis/src/impl_wf_check/min_specialization.rs
@@ -77,6 +77,7 @@
 use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
 use rustc_trait_selection::traits::outlives_bounds::InferCtxtExt as _;
 use rustc_trait_selection::traits::{self, translate_args_with_cause, wf, ObligationCtxt};
+use tracing::{debug, instrument};
 
 use crate::errors::GenericArgsOnOverriddenImpl;
 use crate::{constrained_generic_params as cgp, errors};
diff --git a/compiler/rustc_hir_analysis/src/lib.rs b/compiler/rustc_hir_analysis/src/lib.rs
index 891e4fcd019..1481a4dd141 100644
--- a/compiler/rustc_hir_analysis/src/lib.rs
+++ b/compiler/rustc_hir_analysis/src/lib.rs
@@ -75,9 +75,6 @@
 #![warn(unreachable_pub)]
 // tidy-alphabetical-end
 
-#[macro_use]
-extern crate tracing;
-
 // These are used by Clippy.
 pub mod check;
 
diff --git a/compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs b/compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs
index 454c20d3e64..c2377b4781c 100644
--- a/compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs
+++ b/compiler/rustc_hir_analysis/src/outlives/implicit_infer.rs
@@ -3,6 +3,7 @@
 use rustc_hir::def_id::DefId;
 use rustc_middle::ty::{self, GenericArg, GenericArgKind, Ty, TyCtxt};
 use rustc_span::Span;
+use tracing::debug;
 
 use super::explicit::ExplicitPredicatesMap;
 use super::utils::*;
diff --git a/compiler/rustc_hir_analysis/src/variance/constraints.rs b/compiler/rustc_hir_analysis/src/variance/constraints.rs
index 4fb7a02f8c9..415b23d812b 100644
--- a/compiler/rustc_hir_analysis/src/variance/constraints.rs
+++ b/compiler/rustc_hir_analysis/src/variance/constraints.rs
@@ -8,6 +8,7 @@
 use rustc_hir::def::DefKind;
 use rustc_middle::ty::{self, GenericArgKind, GenericArgsRef, Ty, TyCtxt};
 use rustc_middle::{bug, span_bug};
+use tracing::{debug, instrument};
 
 use super::terms::VarianceTerm::*;
 use super::terms::*;
diff --git a/compiler/rustc_hir_analysis/src/variance/mod.rs b/compiler/rustc_hir_analysis/src/variance/mod.rs
index e8e2caf7e62..12bb9a3f9e0 100644
--- a/compiler/rustc_hir_analysis/src/variance/mod.rs
+++ b/compiler/rustc_hir_analysis/src/variance/mod.rs
@@ -12,6 +12,7 @@
 use rustc_middle::ty::{
     self, CrateVariancesMap, GenericArgsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable,
 };
+use tracing::{debug, instrument};
 
 /// Defines the `TermsContext` basically houses an arena where we can
 /// allocate terms.
diff --git a/compiler/rustc_hir_analysis/src/variance/solve.rs b/compiler/rustc_hir_analysis/src/variance/solve.rs
index 4f1bac17e71..d0bdca86779 100644
--- a/compiler/rustc_hir_analysis/src/variance/solve.rs
+++ b/compiler/rustc_hir_analysis/src/variance/solve.rs
@@ -7,6 +7,7 @@
 
 use rustc_hir::def_id::DefIdMap;
 use rustc_middle::ty;
+use tracing::debug;
 
 use super::constraints::*;
 use super::terms::VarianceTerm::*;
diff --git a/compiler/rustc_hir_analysis/src/variance/terms.rs b/compiler/rustc_hir_analysis/src/variance/terms.rs
index 597699b37b1..cf38957bf24 100644
--- a/compiler/rustc_hir_analysis/src/variance/terms.rs
+++ b/compiler/rustc_hir_analysis/src/variance/terms.rs
@@ -15,6 +15,7 @@
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{LocalDefId, LocalDefIdMap};
 use rustc_middle::ty::{self, TyCtxt};
+use tracing::debug;
 
 use self::VarianceTerm::*;