Replace from log to tracing

src/librustc_ast_lowering/item.rs

@@ -17,9 +17,9 @@ use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::Span;
 use rustc_target::spec::abi;
 
-use tracing::debug;
 use smallvec::{smallvec, SmallVec};
 use std::collections::BTreeSet;
+use tracing::debug;
 
 pub(super) struct ItemLowerer<'a, 'lowering, 'hir> {
     pub(super) lctx: &'a mut LoweringContext<'lowering, 'hir>,

src/librustc_ast_lowering/lib.rs

@@ -64,10 +64,10 @@ use rustc_span::source_map::{respan, DesugaringKind, ExpnData, ExpnKind};
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::Span;
 
-use tracing::{debug, trace};
 use smallvec::{smallvec, SmallVec};
 use std::collections::BTreeMap;
 use std::mem;
+use tracing::{debug, trace};
 
 macro_rules! arena_vec {
     ($this:expr; $($x:expr),*) => ({

src/librustc_ast_lowering/path.rs

@@ -12,8 +12,8 @@ use rustc_session::lint::BuiltinLintDiagnostics;
 use rustc_span::symbol::Ident;
 use rustc_span::Span;
 
-use tracing::debug;
 use smallvec::smallvec;
+use tracing::debug;
 
 impl<'a, 'hir> LoweringContext<'a, 'hir> {
     crate fn lower_qpath(

src/librustc_ast_pretty/pp.rs

@@ -132,10 +132,10 @@
 //! methods called `Printer::scan_*`, and the 'PRINT' process is the
 //! method called `Printer::print`.
 
-use tracing::debug;
 use std::borrow::Cow;
 use std::collections::VecDeque;
 use std::fmt;
+use tracing::debug;
 
 /// How to break. Described in more detail in the module docs.
 #[derive(Clone, Copy, PartialEq)]