Remove extern crate rustc_middle from numerous crates.

compiler/rustc_lint/src/array_into_iter.rs

@@ -3,6 +3,7 @@ use crate::{
     LateContext, LateLintPass, LintContext,
 };
 use rustc_hir as hir;
+use rustc_middle::bug;
 use rustc_middle::ty;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment};
 use rustc_session::lint::FutureIncompatibilityReason;

compiler/rustc_lint/src/builtin.rs

@@ -51,6 +51,7 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
 use rustc_hir::intravisit::FnKind as HirFnKind;
 use rustc_hir::{Body, FnDecl, GenericParamKind, Node, PatKind, PredicateOrigin};
+use rustc_middle::bug;
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::print::with_no_trimmed_paths;

compiler/rustc_lint/src/context.rs

@@ -27,6 +27,7 @@ use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::def_id::{CrateNum, DefId};
 use rustc_hir::definitions::{DefPathData, DisambiguatedDefPathData};
+use rustc_middle::bug;
 use rustc_middle::middle::privacy::EffectiveVisibilities;
 use rustc_middle::ty::layout::{LayoutError, LayoutOfHelpers, TyAndLayout};
 use rustc_middle::ty::print::{with_no_trimmed_paths, PrintError};

compiler/rustc_lint/src/context/diagnostics/check_cfg.rs

@@ -1,4 +1,5 @@
 use rustc_errors::{Applicability, Diag};
+use rustc_middle::bug;
 use rustc_session::{config::ExpectedValues, Session};
 use rustc_span::edit_distance::find_best_match_for_name;
 use rustc_span::{sym, Span, Symbol};

compiler/rustc_lint/src/levels.rs

@@ -22,6 +22,7 @@ use rustc_hir as hir;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::HirId;
 use rustc_index::IndexVec;
+use rustc_middle::bug;
 use rustc_middle::hir::nested_filter;
 use rustc_middle::lint::{
     lint_level, reveal_actual_level, LevelAndSource, LintExpectation, LintLevelSource,

compiler/rustc_lint/src/lib.rs

@@ -39,8 +39,6 @@
 #![feature(rustc_attrs)]
 #![allow(internal_features)]
 
-#[macro_use]
-extern crate rustc_middle;
 #[macro_use]
 extern crate tracing;
 

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -4,6 +4,7 @@ use rustc_ast as ast;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_infer::infer::TyCtxtInferExt;
+use rustc_middle::bug;
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty;
 use rustc_parse_format::{ParseMode, Parser, Piece};

compiler/rustc_lint/src/types.rs

@@ -17,6 +17,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::DiagMessage;
 use rustc_hir as hir;
 use rustc_hir::{is_range_literal, Expr, ExprKind, Node};
+use rustc_middle::bug;
 use rustc_middle::ty::layout::{IntegerExt, LayoutOf, SizeSkeleton};
 use rustc_middle::ty::GenericArgsRef;
 use rustc_middle::ty::{