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.

Author: nnethercote

compiler/rustc_errors/src/diagnostic_impls.rs

@@ -108,13 +108,13 @@ impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::ExistentialTrait
 }
 
 impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::UnevaluatedConst<I> {
-    fn into_diag_arg(self) -> rustc_errors::DiagArgValue {
+    fn into_diag_arg(self) -> DiagArgValue {
         format!("{self:?}").into_diag_arg()
     }
 }
 
 impl<I: rustc_type_ir::Interner> IntoDiagArg for rustc_type_ir::FnSig<I> {
-    fn into_diag_arg(self) -> rustc_errors::DiagArgValue {
+    fn into_diag_arg(self) -> DiagArgValue {
         format!("{self:?}").into_diag_arg()
     }
 }

compiler/rustc_middle/src/hir/map/mod.rs

@@ -10,11 +10,10 @@ use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
 use rustc_hir::intravisit::Visitor;
 use rustc_hir::*;
 use rustc_hir_pretty as pprust_hir;
-use rustc_middle::hir::nested_filter;
 use rustc_span::def_id::StableCrateId;
 use rustc_span::{ErrorGuaranteed, Ident, Span, Symbol, kw, sym, with_metavar_spans};
 
-use crate::hir::ModuleItems;
+use crate::hir::{ModuleItems, nested_filter};
 use crate::middle::debugger_visualizer::DebuggerVisualizerFile;
 use crate::query::LocalCrate;
 use crate::ty::TyCtxt;

compiler/rustc_middle/src/middle/stability.rs

@@ -13,7 +13,6 @@ use rustc_feature::GateIssue;
 use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdMap};
 use rustc_hir::{self as hir, HirId};
 use rustc_macros::{Decodable, Encodable, HashStable, Subdiagnostic};
-use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_session::Session;
 use rustc_session::lint::builtin::{DEPRECATED, DEPRECATED_IN_FUTURE, SOFT_UNSTABLE};
 use rustc_session::lint::{BuiltinLintDiag, DeprecatedSinceKind, Level, Lint, LintBuffer};
@@ -23,6 +22,7 @@ use tracing::debug;
 
 pub use self::StabilityLevel::*;
 use crate::ty::TyCtxt;
+use crate::ty::print::with_no_trimmed_paths;
 
 #[derive(PartialEq, Clone, Copy, Debug)]
 pub enum StabilityLevel {

compiler/rustc_middle/src/mir/generic_graph.rs

@@ -1,5 +1,6 @@
 use gsgdt::{Edge, Graph, Node, NodeStyle};
-use rustc_middle::mir::*;
+
+use crate::mir::*;
 
 /// Convert an MIR function into a gsgdt Graph
 pub(crate) fn mir_fn_to_generic_graph<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'_>) -> Graph {

compiler/rustc_middle/src/mir/generic_graphviz.rs

@@ -2,7 +2,8 @@ use std::io::{self, Write};
 
 use rustc_data_structures::graph::{self, iterate};
 use rustc_graphviz as dot;
-use rustc_middle::ty::TyCtxt;
+
+use crate::ty::TyCtxt;
 
 pub struct GraphvizWriter<
     'a,

compiler/rustc_middle/src/mir/graphviz.rs

@@ -2,10 +2,10 @@ use std::io::{self, Write};
 
 use gsgdt::GraphvizSettings;
 use rustc_graphviz as dot;
-use rustc_middle::mir::*;
 
 use super::generic_graph::mir_fn_to_generic_graph;
 use super::pretty::dump_mir_def_ids;
+use crate::mir::*;
 
 /// Write a graphviz DOT graph of a list of MIRs.
 pub fn write_mir_graphviz<W>(tcx: TyCtxt<'_>, single: Option<DefId>, w: &mut W) -> io::Result<()>

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -20,7 +20,6 @@ use rustc_data_structures::sync::{AtomicU64, Lock};
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
-use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_serialize::{Decodable, Encodable};
 use tracing::{debug, trace};
 // Also make the error macros available from this module.
@@ -46,6 +45,7 @@ pub use self::pointer::{CtfeProvenance, Pointer, PointerArithmetic, Provenance};
 pub use self::value::Scalar;
 use crate::mir;
 use crate::ty::codec::{TyDecoder, TyEncoder};
+use crate::ty::print::with_no_trimmed_paths;
 use crate::ty::{self, Instance, Ty, TyCtxt};
 
 /// Uniquely identifies one of the following:

compiler/rustc_middle/src/mir/patch.rs

@@ -1,6 +1,7 @@
-use rustc_middle::mir::*;
 use tracing::debug;
 
+use crate::mir::*;
+
 /// This struct represents a patch to MIR, which can add
 /// new statements and basic blocks and patch over block
 /// terminators.

compiler/rustc_middle/src/mir/pretty.rs

@@ -5,17 +5,16 @@ use std::{fs, io};
 
 use rustc_abi::Size;
 use rustc_ast::InlineAsmTemplatePiece;
-use rustc_middle::mir::interpret::{
-    AllocBytes, AllocId, Allocation, GlobalAlloc, Pointer, Provenance, alloc_range,
-    read_target_uint,
-};
-use rustc_middle::mir::visit::Visitor;
-use rustc_middle::mir::*;
 use tracing::trace;
 use ty::print::PrettyPrinter;
 
 use super::graphviz::write_mir_fn_graphviz;
-use crate::mir::interpret::ConstAllocation;
+use crate::mir::interpret::{
+    AllocBytes, AllocId, Allocation, ConstAllocation, GlobalAlloc, Pointer, Provenance,
+    alloc_range, read_target_uint,
+};
+use crate::mir::visit::Visitor;
+use crate::mir::*;
 
 const INDENT: &str = "    ";
 /// Alignment for lining up comments following MIR statements

compiler/rustc_middle/src/query/erase.rs

@@ -101,9 +101,9 @@ impl<T> EraseType for Result<&'_ T, &'_ ty::layout::FnAbiError<'_>> {
     type Result = [u8; size_of::<Result<&'static (), &'static ty::layout::FnAbiError<'static>>>()];
 }
 
-impl<T> EraseType for Result<(&'_ T, rustc_middle::thir::ExprId), rustc_errors::ErrorGuaranteed> {
+impl<T> EraseType for Result<(&'_ T, crate::thir::ExprId), rustc_errors::ErrorGuaranteed> {
     type Result = [u8; size_of::<
-        Result<(&'static (), rustc_middle::thir::ExprId), rustc_errors::ErrorGuaranteed>,
+        Result<(&'static (), crate::thir::ExprId), rustc_errors::ErrorGuaranteed>,
     >()];
 }