Remove extern crate tracing from numerous crates.

Author: nnethercote

compiler/rustc_ast/src/lib.rs

@@ -20,9 +20,6 @@
 #![feature(negative_impls)]
 #![feature(stmt_expr_attributes)]
 
-#[macro_use]
-extern crate tracing;
-
 pub mod util {
     pub mod case;
     pub mod classify;

compiler/rustc_ast/src/util/literal.rs

@@ -8,6 +8,7 @@ use rustc_lexer::unescape::{
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::Span;
 use std::{ascii, fmt, str};
+use tracing::debug;
 
 // Escapes a string, represented as a symbol. Reuses the original symbol,
 // avoiding interning, if no changes are required.

compiler/rustc_ast_lowering/src/index.rs

@@ -7,6 +7,7 @@ use rustc_index::IndexVec;
 use rustc_middle::span_bug;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::{Span, DUMMY_SP};
+use tracing::{debug, instrument};
 
 /// A visitor that walks over the HIR and collects `Node`s into a HIR map.
 struct NodeCollector<'a, 'hir> {

compiler/rustc_ast_lowering/src/item.rs

@@ -20,6 +20,7 @@ use rustc_span::{DesugaringKind, Span, Symbol};
 use rustc_target::spec::abi;
 use smallvec::{smallvec, SmallVec};
 use thin_vec::ThinVec;
+use tracing::instrument;
 
 pub(super) struct ItemLowerer<'a, 'hir> {
     pub(super) tcx: TyCtxt<'hir>,

compiler/rustc_ast_lowering/src/lib.rs

@@ -37,11 +37,7 @@
 #![feature(box_patterns)]
 #![feature(let_chains)]
 
-#[macro_use]
-extern crate tracing;
-
 use crate::errors::{AssocTyParentheses, AssocTyParenthesesSub, MisplacedImplTrait};
-
 use rustc_ast::node_id::NodeMap;
 use rustc_ast::ptr::P;
 use rustc_ast::{self as ast, *};
@@ -69,6 +65,7 @@ use rustc_span::{DesugaringKind, Span, DUMMY_SP};
 use smallvec::{smallvec, SmallVec};
 use std::collections::hash_map::Entry;
 use thin_vec::ThinVec;
+use tracing::{debug, instrument, trace};
 
 macro_rules! arena_vec {
     ($this:expr; $($x:expr),*) => (

compiler/rustc_ast_lowering/src/path.rs

@@ -18,6 +18,7 @@ use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::{BytePos, DesugaringKind, Span, Symbol, DUMMY_SP};
 
 use smallvec::{smallvec, SmallVec};
+use tracing::{debug, instrument};
 
 impl<'a, 'hir> LoweringContext<'a, 'hir> {
     #[instrument(level = "trace", skip(self))]

compiler/rustc_builtin_macros/src/cfg_eval.rs

@@ -18,6 +18,7 @@ use rustc_session::Session;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
 use smallvec::SmallVec;
+use tracing::instrument;
 
 pub(crate) fn expand(
     ecx: &mut ExtCtxt<'_>,

compiler/rustc_builtin_macros/src/lib.rs

@@ -19,11 +19,7 @@
 
 extern crate proc_macro;
 
-#[macro_use]
-extern crate tracing;
-
 use crate::deriving::*;
-
 use rustc_expand::base::{MacroExpanderFn, ResolverExpand, SyntaxExtensionKind};
 use rustc_expand::proc_macro::BangProcMacro;
 use rustc_span::symbol::sym;

compiler/rustc_builtin_macros/src/test.rs

@@ -12,6 +12,7 @@ use rustc_span::{ErrorGuaranteed, FileNameDisplayPreference, Span};
 use std::assert_matches::assert_matches;
 use std::iter;
 use thin_vec::{thin_vec, ThinVec};
+use tracing::debug;
 
 /// #[test_case] is used by custom test authors to mark tests
 /// When building for test, it needs to make the item public and gensym the name

compiler/rustc_driver_impl/src/lib.rs

@@ -14,9 +14,6 @@
 #![feature(panic_update_hook)]
 #![feature(result_flattening)]
 
-#[macro_use]
-extern crate tracing;
-
 use rustc_ast as ast;
 use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults};
 use rustc_const_eval::CTRL_C_RECEIVED;
@@ -46,7 +43,6 @@ use rustc_span::symbol::sym;
 use rustc_span::FileName;
 use rustc_target::json::ToJson;
 use rustc_target::spec::{Target, TargetTriple};
-
 use std::cmp::max;
 use std::collections::BTreeMap;
 use std::env;
@@ -62,6 +58,7 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, OnceLock};
 use std::time::{Instant, SystemTime};
 use time::OffsetDateTime;
+use tracing::trace;
 
 #[allow(unused_macros)]
 macro do_not_use_print($($t:tt)*) {