Rollup merge of #136847 - nnethercote:simplify-intra-crate-quals, r=oli-obk

Simplify intra-crate qualifiers.

The following is a weird pattern for a file within `rustc_middle`:
```
use rustc_middle::aaa;
use crate::bbb;
```
More sensible and standard would be this:
```
use crate::{aaa, bbb};
```
I.e. we generally prefer using `crate::` to using a crate's own name. (Exceptions are things like in macros where `crate::` doesn't work because the macro is used in multiple crates.)

This commit fixes a bunch of these weird qualifiers.

r? `@jieyouxu`

5 files changed, 7 insertions, 8 deletions

diff --git a/compiler/rustc_middle/src/ty/cast.rs b/compiler/rustc_middle/src/ty/cast.rs
index b1316ceef5a..10f7d589636 100644
--- a/compiler/rustc_middle/src/ty/cast.rs
+++ b/compiler/rustc_middle/src/ty/cast.rs
@@ -2,8 +2,8 @@
 // typeck and codegen.
 
 use rustc_macros::{HashStable, TyDecodable, TyEncodable};
-use rustc_middle::mir;
 
+use crate::mir;
 use crate::ty::{self, Ty};
 
 /// Types that are represented as ints.
diff --git a/compiler/rustc_middle/src/ty/codec.rs b/compiler/rustc_middle/src/ty/codec.rs
index 94bf1aa4f03..6b6e0ffc656 100644
--- a/compiler/rustc_middle/src/ty/codec.rs
+++ b/compiler/rustc_middle/src/ty/codec.rs
@@ -13,8 +13,6 @@ use std::marker::DiscriminantKind;
 use rustc_abi::{FieldIdx, VariantIdx};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def_id::LocalDefId;
-use rustc_middle::mir::mono::MonoItem;
-use rustc_middle::ty::TyCtxt;
 use rustc_serialize::{Decodable, Encodable};
 use rustc_span::Span;
 use rustc_span::source_map::Spanned;
@@ -23,9 +21,10 @@ pub use rustc_type_ir::{TyDecoder, TyEncoder};
 use crate::arena::ArenaAllocatable;
 use crate::infer::canonical::{CanonicalVarInfo, CanonicalVarInfos};
 use crate::mir::interpret::{AllocId, ConstAllocation, CtfeProvenance};
+use crate::mir::mono::MonoItem;
 use crate::mir::{self};
 use crate::traits;
-use crate::ty::{self, AdtDef, GenericArgsRef, Ty};
+use crate::ty::{self, AdtDef, GenericArgsRef, Ty, TyCtxt};
 
 /// The shorthand encoding uses an enum's variant index `usize`
 /// and is offset by this value so it never matches a real variant.
diff --git a/compiler/rustc_middle/src/ty/instance.rs b/compiler/rustc_middle/src/ty/instance.rs
index b7a648aae3f..e9c19331e4a 100644
--- a/compiler/rustc_middle/src/ty/instance.rs
+++ b/compiler/rustc_middle/src/ty/instance.rs
@@ -10,13 +10,13 @@ use rustc_hir::def_id::{CrateNum, DefId};
 use rustc_hir::lang_items::LangItem;
 use rustc_index::bit_set::FiniteBitSet;
 use rustc_macros::{Decodable, Encodable, HashStable, Lift, TyDecodable, TyEncodable};
-use rustc_middle::ty::normalize_erasing_regions::NormalizationError;
 use rustc_span::def_id::LOCAL_CRATE;
 use rustc_span::{DUMMY_SP, Span, Symbol};
 use tracing::{debug, instrument};
 
 use crate::error;
 use crate::middle::codegen_fn_attrs::CodegenFnAttrFlags;
+use crate::ty::normalize_erasing_regions::NormalizationError;
 use crate::ty::print::{FmtPrinter, Printer, shrunk_instance_name};
 use crate::ty::{
     self, EarlyBinder, GenericArgs, GenericArgsRef, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index feae8ea312e..343aabd7bbb 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -1512,7 +1512,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
             ty::ExprKind::Binop(op) => {
                 let (_, _, c1, c2) = expr.binop_args();
 
-                let precedence = |binop: rustc_middle::mir::BinOp| {
+                let precedence = |binop: crate::mir::BinOp| {
                     use rustc_ast::util::parser::AssocOp;
                     AssocOp::from_ast_binop(binop.to_hir_binop()).precedence()
                 };
@@ -1558,7 +1558,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
             ty::ExprKind::UnOp(op) => {
                 let (_, ct) = expr.unop_args();
 
-                use rustc_middle::mir::UnOp;
+                use crate::mir::UnOp;
                 let formatted_op = match op {
                     UnOp::Not => "!",
                     UnOp::Neg => "-",
diff --git a/compiler/rustc_middle/src/ty/typeck_results.rs b/compiler/rustc_middle/src/ty/typeck_results.rs
index 49bdb5e9dc3..1b5b791bb24 100644
--- a/compiler/rustc_middle/src/ty/typeck_results.rs
+++ b/compiler/rustc_middle/src/ty/typeck_results.rs
@@ -14,13 +14,13 @@ use rustc_hir::{
 };
 use rustc_index::IndexVec;
 use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
-use rustc_middle::mir::FakeReadCause;
 use rustc_session::Session;
 use rustc_span::Span;
 
 use super::RvalueScopes;
 use crate::hir::place::Place as HirPlace;
 use crate::infer::canonical::Canonical;
+use crate::mir::FakeReadCause;
 use crate::traits::ObligationCause;
 use crate::ty::{
     self, BoundVar, CanonicalPolyFnSig, ClosureSizeProfileData, GenericArgKind, GenericArgs,