Always use ty:: qualifier for TyKind enum variants.

Because that's the way it should be done.

Author: nnethercote

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -9,9 +9,10 @@ use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::traits::{ImplSource, Obligation, ObligationCause};
 use rustc_middle::mir::{self, CallSource};
 use rustc_middle::ty::print::with_no_trimmed_paths;
-use rustc_middle::ty::TraitRef;
-use rustc_middle::ty::{suggest_constraining_type_param, Adt, Closure, FnDef, FnPtr, Param, Ty};
-use rustc_middle::ty::{GenericArgKind, GenericArgsRef};
+use rustc_middle::ty::{
+    self as middle_ty, suggest_constraining_type_param, Closure, FnDef, FnPtr, GenericArgKind,
+    GenericArgsRef, Param, TraitRef, Ty,
+};
 use rustc_middle::util::{call_kind, CallDesugaringKind, CallKind};
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::sym;
@@ -123,7 +124,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                         );
                     }
                 }
-                Adt(..) => {
+                middle_ty::Adt(..) => {
                     let obligation =
                         Obligation::new(tcx, ObligationCause::dummy(), param_env, trait_ref);
 

compiler/rustc_hir_typeck/src/method/prelude2021.rs

@@ -8,7 +8,7 @@ use hir::ItemKind;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
-use rustc_middle::ty::{Adt, Array, Ref, Ty};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::lint::builtin::RUST_2021_PRELUDE_COLLISIONS;
 use rustc_span::symbol::kw::{Empty, Underscore};
 use rustc_span::symbol::{sym, Ident};
@@ -44,7 +44,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // but `[T; N].into_iter()` doesn't resolve to IntoIterator::into_iter
             // before Rust 2021, which results in the same problem.
             // It is only a problem for arrays.
-            sym::into_iter if let Array(..) = self_ty.kind() => {
+            sym::into_iter if let ty::Array(..) = self_ty.kind() => {
                 // In this case, it wasn't really a prelude addition that was the problem.
                 // Instead, the problem is that the array-into_iter hack will no longer apply in Rust 2021.
                 rustc_lint::ARRAY_INTO_ITER
@@ -64,7 +64,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     pick.autoref_or_ptr_adjustment,
                     Some(probe::AutorefOrPtrAdjustment::Autoref { .. })
                 )
-                && matches!(self_ty.kind(), Ref(..))
+                && matches!(self_ty.kind(), ty::Ref(..))
             {
                 return;
             }
@@ -280,7 +280,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 // the user has written the self type with generics already which we (naively) do by looking
                 // for a "<" in `self_ty_name`.
                 if !self_ty_name.contains('<') {
-                    if let Adt(def, _) = self_ty.kind() {
+                    if let ty::Adt(def, _) = self_ty.kind() {
                         let generics = self.tcx.generics_of(def.did());
                         if !generics.params.is_empty() {
                             let counts = generics.own_counts();

compiler/rustc_hir_typeck/src/pat.rs

@@ -12,7 +12,7 @@ use rustc_hir::{HirId, Pat, PatKind};
 use rustc_infer::infer;
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_middle::mir::interpret::ErrorHandled;
-use rustc_middle::ty::{self, Adt, BindingMode, Ty, TypeVisitableExt};
+use rustc_middle::ty::{self, BindingMode, Ty, TypeVisitableExt};
 use rustc_session::lint::builtin::NON_EXHAUSTIVE_OMITTED_PATTERNS;
 use rustc_span::edit_distance::find_best_match_for_name;
 use rustc_span::hygiene::DesugaringKind;
@@ -1007,7 +1007,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     }
                     _ => {
                         let (type_def_id, item_def_id) = match pat_ty.kind() {
-                            Adt(def, _) => match res {
+                            ty::Adt(def, _) => match res {
                                 Res::Def(DefKind::Const, def_id) => (Some(def.did()), Some(def_id)),
                                 _ => (None, None),
                             },

src/librustdoc/html/render/type_layout.rs

@@ -3,8 +3,7 @@ use askama::Template;
 use rustc_data_structures::captures::Captures;
 use rustc_hir::def_id::DefId;
 use rustc_middle::span_bug;
-use rustc_middle::ty::layout::LayoutError;
-use rustc_middle::ty::Adt;
+use rustc_middle::ty::{self, layout::LayoutError};
 use rustc_span::symbol::Symbol;
 use rustc_target::abi::{Primitive, TagEncoding, Variants};
 
@@ -57,7 +56,7 @@ pub(crate) fn document_type_layout<'a, 'cx: 'a>(
             variants
                 .iter_enumerated()
                 .map(|(variant_idx, variant_layout)| {
-                    let Adt(adt, _) = type_layout.ty.kind() else {
+                    let ty::Adt(adt, _) = type_layout.ty.kind() else {
                         span_bug!(tcx.def_span(ty_def_id), "not an adt")
                     };
                     let name = adt.variant(variant_idx).name;

src/tools/clippy/clippy_lints/src/derivable_impls.rs

@@ -9,7 +9,7 @@ use rustc_hir::{
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::adjustment::{Adjust, PointerCoercion};
-use rustc_middle::ty::{self, Adt, AdtDef, GenericArgsRef, Ty, TypeckResults};
+use rustc_middle::ty::{self, AdtDef, GenericArgsRef, Ty, TypeckResults};
 use rustc_session::impl_lint_pass;
 use rustc_span::sym;
 
@@ -198,7 +198,7 @@ impl<'tcx> LateLintPass<'tcx> for DerivableImpls {
             && let Node::ImplItem(impl_item) = cx.tcx.hir_node(impl_item_hir)
             && let ImplItemKind::Fn(_, b) = &impl_item.kind
             && let Body { value: func_expr, .. } = cx.tcx.hir().body(*b)
-            && let &Adt(adt_def, args) = cx.tcx.type_of(item.owner_id).instantiate_identity().kind()
+            && let &ty::Adt(adt_def, args) = cx.tcx.type_of(item.owner_id).instantiate_identity().kind()
             && let attrs = cx.tcx.hir().attrs(item.hir_id())
             && !attrs.iter().any(|attr| attr.doc_str().is_some())
             && cx.tcx.hir().attrs(impl_item_hir).is_empty()

src/tools/clippy/clippy_lints/src/from_raw_with_void_ptr.rs

@@ -4,7 +4,7 @@ use clippy_utils::ty::is_c_void;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{Expr, ExprKind, QPath};
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_middle::ty::{RawPtr, TypeAndMut};
+use rustc_middle::ty::{self, TypeAndMut};
 use rustc_session::declare_lint_pass;
 use rustc_span::sym;
 
@@ -44,7 +44,7 @@ impl LateLintPass<'_> for FromRawWithVoidPtr {
             && seg.ident.name == sym!(from_raw)
             && let Some(type_str) = path_def_id(cx, ty).and_then(|id| def_id_matches_type(cx, id))
             && let arg_kind = cx.typeck_results().expr_ty(arg).kind()
-            && let RawPtr(TypeAndMut { ty, .. }) = arg_kind
+            && let ty::RawPtr(TypeAndMut { ty, .. }) = arg_kind
             && is_c_void(cx, *ty)
         {
             let msg = format!("creating a `{type_str}` from a void raw pointer");

src/tools/clippy/clippy_lints/src/functions/result.rs

@@ -2,7 +2,7 @@ use rustc_errors::Diag;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LintContext};
 use rustc_middle::lint::in_external_macro;
-use rustc_middle::ty::{self, Adt, Ty};
+use rustc_middle::ty::{self, Ty};
 use rustc_span::{sym, Span};
 
 use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then};
@@ -86,7 +86,7 @@ fn check_result_unit_err(cx: &LateContext<'_>, err_ty: Ty<'_>, fn_header_span: S
 }
 
 fn check_result_large_err<'tcx>(cx: &LateContext<'tcx>, err_ty: Ty<'tcx>, hir_ty_span: Span, large_err_threshold: u64) {
-    if let Adt(adt, subst) = err_ty.kind()
+    if let ty::Adt(adt, subst) = err_ty.kind()
         && let Some(local_def_id) = err_ty
             .ty_adt_def()
             .expect("already checked this is adt")

src/tools/clippy/clippy_lints/src/implicit_saturating_add.rs

@@ -7,7 +7,7 @@ use rustc_data_structures::packed::Pu128;
 use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, Block, Expr, ExprKind, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_middle::ty::{Int, IntTy, Ty, Uint, UintTy};
+use rustc_middle::ty::{IntTy, Ty, UintTy};
 use rustc_session::declare_lint_pass;
 
 declare_clippy_lint! {
@@ -97,6 +97,7 @@ impl<'tcx> LateLintPass<'tcx> for ImplicitSaturatingAdd {
 }
 
 fn get_int_max(ty: Ty<'_>) -> Option<u128> {
+    use rustc_middle::ty::{Int, Uint};
     match ty.peel_refs().kind() {
         Int(IntTy::I8) => i8::MAX.try_into().ok(),
         Int(IntTy::I16) => i16::MAX.try_into().ok(),

src/tools/clippy/clippy_lints/src/large_enum_variant.rs

@@ -7,7 +7,7 @@ use rustc_errors::Applicability;
 use rustc_hir::{Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::lint::in_external_macro;
-use rustc_middle::ty::{Adt, Ty};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::impl_lint_pass;
 use rustc_span::Span;
 
@@ -82,7 +82,7 @@ impl<'tcx> LateLintPass<'tcx> for LargeEnumVariant {
         }
         if let ItemKind::Enum(ref def, _) = item.kind {
             let ty = cx.tcx.type_of(item.owner_id).instantiate_identity();
-            let Adt(adt, subst) = ty.kind() else {
+            let ty::Adt(adt, subst) = ty.kind() else {
                 panic!("already checked whether this is an enum")
             };
             if adt.variants().len() <= 1 {
@@ -167,7 +167,7 @@ impl<'tcx> LateLintPass<'tcx> for LargeEnumVariant {
 }
 
 fn maybe_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
-    if let Adt(_def, args) = ty.kind()
+    if let ty::Adt(_def, args) = ty.kind()
         && args.types().next().is_some()
         && let Some(copy_trait) = cx.tcx.lang_items().copy_trait()
     {

src/tools/clippy/clippy_lints/src/methods/unnecessary_join.rs

@@ -4,7 +4,7 @@ use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, LangItem};
 use rustc_lint::LateContext;
-use rustc_middle::ty::{Ref, Slice};
+use rustc_middle::ty;
 use rustc_span::Span;
 
 use super::UNNECESSARY_JOIN;
@@ -18,9 +18,9 @@ pub(super) fn check<'tcx>(
 ) {
     let applicability = Applicability::MachineApplicable;
     let collect_output_adjusted_type = cx.typeck_results().expr_ty_adjusted(join_self_arg);
-    if let Ref(_, ref_type, _) = collect_output_adjusted_type.kind()
+    if let ty::Ref(_, ref_type, _) = collect_output_adjusted_type.kind()
         // the turbofish for collect is ::<Vec<String>>
-        && let Slice(slice) = ref_type.kind()
+        && let ty::Slice(slice) = ref_type.kind()
         && is_type_lang_item(cx, *slice, LangItem::String)
         // the argument for join is ""
         && let ExprKind::Lit(spanned) = &join_arg.kind