Remove #[macro_use] extern crate tracing from rustc_mir_build.

Author: nnethercote

compiler/rustc_mir_build/src/build/block.rs

@@ -5,6 +5,7 @@ use rustc_middle::span_bug;
 use rustc_middle::thir::*;
 use rustc_middle::{mir::*, ty};
 use rustc_span::Span;
+use tracing::debug;
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     pub(crate) fn ast_block(

compiler/rustc_mir_build/src/build/cfg.rs

@@ -3,6 +3,7 @@
 use crate::build::CFG;
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
+use tracing::debug;
 
 impl<'tcx> CFG<'tcx> {
     pub(crate) fn block_data(&self, blk: BasicBlock) -> &BasicBlockData<'tcx> {

compiler/rustc_mir_build/src/build/custom/parse.rs

@@ -38,7 +38,7 @@ macro_rules! parse_by_kind {
     ) => {{
         let expr_id = $self.preparse($expr_id);
         let expr = &$self.thir[expr_id];
-        debug!("Trying to parse {:?} as {}", expr.kind, $expected);
+        tracing::debug!("Trying to parse {:?} as {}", expr.kind, $expected);
         let $expr_name = expr;
         match &expr.kind {
             $(

compiler/rustc_mir_build/src/build/expr/as_constant.rs

@@ -11,6 +11,7 @@ use rustc_middle::ty::{
 };
 use rustc_middle::{bug, span_bug};
 use rustc_target::abi::Size;
+use tracing::{instrument, trace};
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// Compile `expr`, yielding a compile-time constant. Assumes that

compiler/rustc_mir_build/src/build/expr/as_operand.rs

@@ -5,6 +5,7 @@ use crate::build::{BlockAnd, BlockAndExtension, Builder, NeedsTemporary};
 use rustc_middle::middle::region;
 use rustc_middle::mir::*;
 use rustc_middle::thir::*;
+use tracing::{debug, instrument};
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// Returns an operand suitable for use until the end of the current

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -15,6 +15,7 @@ use rustc_middle::ty::AdtDef;
 use rustc_middle::ty::{self, CanonicalUserTypeAnnotation, Ty, Variance};
 use rustc_span::Span;
 use rustc_target::abi::{FieldIdx, VariantIdx, FIRST_VARIANT};
+use tracing::{debug, instrument, trace};
 
 use std::assert_matches::assert_matches;
 use std::iter;

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -18,6 +18,7 @@ use rustc_middle::ty::cast::{mir_cast_kind, CastTy};
 use rustc_middle::ty::layout::IntegerExt;
 use rustc_middle::ty::{self, Ty, UpvarArgs};
 use rustc_span::{Span, DUMMY_SP};
+use tracing::debug;
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// Returns an rvalue suitable for use until the end of the current

compiler/rustc_mir_build/src/build/expr/as_temp.rs

@@ -6,6 +6,7 @@ use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_middle::middle::region;
 use rustc_middle::mir::*;
 use rustc_middle::thir::*;
+use tracing::{debug, instrument};
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// Compile `expr` into a fresh temporary. This is used when building

compiler/rustc_mir_build/src/build/expr/into.rs

@@ -12,6 +12,7 @@ use rustc_middle::thir::*;
 use rustc_middle::ty::CanonicalUserTypeAnnotation;
 use rustc_span::source_map::Spanned;
 use std::iter;
+use tracing::{debug, instrument};
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// Compile `expr`, storing the result into `destination`, which

compiler/rustc_mir_build/src/build/expr/stmt.rs

@@ -3,6 +3,7 @@ use crate::build::{BlockAnd, BlockAndExtension, BlockFrame, Builder};
 use rustc_middle::middle::region;
 use rustc_middle::mir::*;
 use rustc_middle::thir::*;
+use tracing::debug;
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
     /// Builds a block of MIR statements to evaluate the THIR `expr`.