Rollup merge of rust-lang#144713 - nnethercote:rustc_middle-ty-cleanups, r=lcnr

`rustc_middle::ty` cleanups

r? `@davidtwco`

Author: Zalathar

compiler/rustc_borrowck/src/diagnostics/bound_region_errors.rs

@@ -277,7 +277,7 @@ where
         // `QueryNormalizeExt::query_normalize` used in the query and `normalize` called below:
         // the former fails to normalize the `nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs`
         // test. Check after #85499 lands to see if its fixes have erased this difference.
-        let (param_env, value) = key.into_parts();
+        let ty::ParamEnvAnd { param_env, value } = key;
         let _ = ocx.normalize(&cause, param_env, value.value);
 
         let diag = try_extract_error_from_fulfill_cx(
@@ -324,7 +324,7 @@ where
             mbcx.infcx.tcx.infer_ctxt().build_with_canonical(cause.span, &self.canonical_query);
         let ocx = ObligationCtxt::new(&infcx);
 
-        let (param_env, value) = key.into_parts();
+        let ty::ParamEnvAnd { param_env, value } = key;
         let _ = ocx.deeply_normalize(&cause, param_env, value.value);
 
         let diag = try_extract_error_from_fulfill_cx(

compiler/rustc_hir_typeck/src/fallback.rs

@@ -18,6 +18,7 @@ use rustc_span::{DUMMY_SP, Span};
 use rustc_trait_selection::traits::{ObligationCause, ObligationCtxt};
 use tracing::debug;
 
+use crate::typeck_root_ctxt::InferVarInfo;
 use crate::{FnCtxt, errors};
 
 #[derive(Copy, Clone)]
@@ -345,7 +346,7 @@ impl<'tcx> FnCtxt<'_, 'tcx> {
                 .map(|(_, info)| *info)
                 .collect();
 
-            let found_infer_var_info = ty::InferVarInfo {
+            let found_infer_var_info = InferVarInfo {
                 self_in_trait: infer_var_infos.items().any(|info| info.self_in_trait),
                 output: infer_var_infos.items().any(|info| info.output),
             };

compiler/rustc_hir_typeck/src/fn_ctxt/adjust_fulfillment_errors.rs

@@ -17,6 +17,21 @@ enum ClauseFlavor {
     Const,
 }
 
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+enum ParamTerm {
+    Ty(ty::ParamTy),
+    Const(ty::ParamConst),
+}
+
+impl ParamTerm {
+    fn index(self) -> usize {
+        match self {
+            ParamTerm::Ty(ty) => ty.index as usize,
+            ParamTerm::Const(ct) => ct.index as usize,
+        }
+    }
+}
+
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     pub(crate) fn adjust_fulfillment_error_for_expr_obligation(
         &self,
@@ -77,17 +92,17 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 _ => return false,
             };
 
-        let find_param_matching = |matches: &dyn Fn(ty::ParamTerm) -> bool| {
+        let find_param_matching = |matches: &dyn Fn(ParamTerm) -> bool| {
             predicate_args.iter().find_map(|arg| {
                 arg.walk().find_map(|arg| {
                     if let ty::GenericArgKind::Type(ty) = arg.kind()
                         && let ty::Param(param_ty) = *ty.kind()
-                        && matches(ty::ParamTerm::Ty(param_ty))
+                        && matches(ParamTerm::Ty(param_ty))
                     {
                         Some(arg)
                     } else if let ty::GenericArgKind::Const(ct) = arg.kind()
                         && let ty::ConstKind::Param(param_ct) = ct.kind()
-                        && matches(ty::ParamTerm::Const(param_ct))
+                        && matches(ParamTerm::Const(param_ct))
                     {
                         Some(arg)
                     } else {
@@ -106,14 +121,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // from a trait or impl, for example.
         let mut fallback_param_to_point_at = find_param_matching(&|param_term| {
             self.tcx.parent(generics.param_at(param_term.index(), self.tcx).def_id) != def_id
-                && !matches!(param_term, ty::ParamTerm::Ty(ty) if ty.name == kw::SelfUpper)
+                && !matches!(param_term, ParamTerm::Ty(ty) if ty.name == kw::SelfUpper)
         });
         // Finally, the `Self` parameter is possibly the reason that the predicate
         // is unsatisfied. This is less likely to be true for methods, because
         // method probe means that we already kinda check that the predicates due
         // to the `Self` type are true.
         let mut self_param_to_point_at = find_param_matching(
-            &|param_term| matches!(param_term, ty::ParamTerm::Ty(ty) if ty.name == kw::SelfUpper),
+            &|param_term| matches!(param_term, ParamTerm::Ty(ty) if ty.name == kw::SelfUpper),
         );
 
         // Finally, for ambiguity-related errors, we actually want to look

compiler/rustc_hir_typeck/src/typeck_root_ctxt.rs

@@ -17,6 +17,19 @@ use tracing::{debug, instrument};
 
 use super::callee::DeferredCallResolution;
 
+#[derive(Debug, Default, Copy, Clone)]
+pub(crate) struct InferVarInfo {
+    /// This is true if we identified that this Ty (`?T`) is found in a `?T: Foo`
+    /// obligation, where:
+    ///
+    ///  * `Foo` is not `Sized`
+    ///  * `(): Foo` may be satisfied
+    pub self_in_trait: bool,
+    /// This is true if we identified that this Ty (`?T`) is found in a `<_ as
+    /// _>::AssocType = ?T`
+    pub output: bool,
+}
+
 /// Data shared between a "typeck root" and its nested bodies,
 /// e.g. closures defined within the function. For example:
 /// ```ignore (illustrative)
@@ -71,7 +84,7 @@ pub(crate) struct TypeckRootCtxt<'tcx> {
     /// fallback. See the `fallback` module for details.
     pub(super) diverging_type_vars: RefCell<UnordSet<Ty<'tcx>>>,
 
-    pub(super) infer_var_info: RefCell<UnordMap<ty::TyVid, ty::InferVarInfo>>,
+    pub(super) infer_var_info: RefCell<UnordMap<ty::TyVid, InferVarInfo>>,
 }
 
 impl<'tcx> Deref for TypeckRootCtxt<'tcx> {

compiler/rustc_infer/src/infer/canonical/canonicalizer.rs

@@ -44,7 +44,7 @@ impl<'tcx> InferCtxt<'tcx> {
     where
         V: TypeFoldable<TyCtxt<'tcx>>,
     {
-        let (param_env, value) = value.into_parts();
+        let ty::ParamEnvAnd { param_env, value } = value;
         let canonical_param_env = self.tcx.canonical_param_env_cache.get_or_insert(
             self.tcx,
             param_env,

compiler/rustc_infer/src/infer/relate/generalize.rs

@@ -19,6 +19,24 @@ use crate::infer::type_variable::TypeVariableValue;
 use crate::infer::unify_key::ConstVariableValue;
 use crate::infer::{InferCtxt, RegionVariableOrigin, relate};
 
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+enum TermVid {
+    Ty(ty::TyVid),
+    Const(ty::ConstVid),
+}
+
+impl From<ty::TyVid> for TermVid {
+    fn from(value: ty::TyVid) -> Self {
+        TermVid::Ty(value)
+    }
+}
+
+impl From<ty::ConstVid> for TermVid {
+    fn from(value: ty::ConstVid) -> Self {
+        TermVid::Const(value)
+    }
+}
+
 impl<'tcx> InferCtxt<'tcx> {
     /// The idea is that we should ensure that the type variable `target_vid`
     /// is equal to, a subtype of, or a supertype of `source_ty`.
@@ -238,20 +256,18 @@ impl<'tcx> InferCtxt<'tcx> {
         &self,
         span: Span,
         structurally_relate_aliases: StructurallyRelateAliases,
-        target_vid: impl Into<ty::TermVid>,
+        target_vid: impl Into<TermVid>,
         ambient_variance: ty::Variance,
         source_term: T,
     ) -> RelateResult<'tcx, Generalization<T>> {
         assert!(!source_term.has_escaping_bound_vars());
         let (for_universe, root_vid) = match target_vid.into() {
-            ty::TermVid::Ty(ty_vid) => {
-                (self.probe_ty_var(ty_vid).unwrap_err(), ty::TermVid::Ty(self.root_var(ty_vid)))
+            TermVid::Ty(ty_vid) => {
+                (self.probe_ty_var(ty_vid).unwrap_err(), TermVid::Ty(self.root_var(ty_vid)))
             }
-            ty::TermVid::Const(ct_vid) => (
+            TermVid::Const(ct_vid) => (
                 self.probe_const_var(ct_vid).unwrap_err(),
-                ty::TermVid::Const(
-                    self.inner.borrow_mut().const_unification_table().find(ct_vid).vid,
-                ),
+                TermVid::Const(self.inner.borrow_mut().const_unification_table().find(ct_vid).vid),
             ),
         };
 
@@ -299,7 +315,7 @@ struct Generalizer<'me, 'tcx> {
     /// The vid of the type variable that is in the process of being
     /// instantiated. If we find this within the value we are folding,
     /// that means we would have created a cyclic value.
-    root_vid: ty::TermVid,
+    root_vid: TermVid,
 
     /// The universe of the type variable that is in the process of being
     /// instantiated. If we find anything that this universe cannot name,
@@ -469,7 +485,7 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for Generalizer<'_, 'tcx> {
             ty::Infer(ty::TyVar(vid)) => {
                 let mut inner = self.infcx.inner.borrow_mut();
                 let vid = inner.type_variables().root_var(vid);
-                if ty::TermVid::Ty(vid) == self.root_vid {
+                if TermVid::Ty(vid) == self.root_vid {
                     // If sub-roots are equal, then `root_vid` and
                     // `vid` are related via subtyping.
                     Err(self.cyclic_term_error())
@@ -621,7 +637,7 @@ impl<'tcx> TypeRelation<TyCtxt<'tcx>> for Generalizer<'_, 'tcx> {
                 // If root const vids are equal, then `root_vid` and
                 // `vid` are related and we'd be inferring an infinitely
                 // deep const.
-                if ty::TermVid::Const(
+                if TermVid::Const(
                     self.infcx.inner.borrow_mut().const_unification_table().find(vid).vid,
                 ) == self.root_vid
                 {

compiler/rustc_interface/src/passes.rs

@@ -29,7 +29,7 @@ use rustc_parse::{
     new_parser_from_file, new_parser_from_source_str, unwrap_or_emit_fatal, validate_attr,
 };
 use rustc_passes::{abi_test, input_stats, layout_test};
-use rustc_resolve::Resolver;
+use rustc_resolve::{Resolver, ResolverOutputs};
 use rustc_session::config::{CrateType, Input, OutFileName, OutputFilenames, OutputType};
 use rustc_session::cstore::Untracked;
 use rustc_session::output::{collect_crate_types, filename_for_input};
@@ -793,7 +793,7 @@ fn resolver_for_lowering_raw<'tcx>(
     // Make sure we don't mutate the cstore from here on.
     tcx.untracked().cstore.freeze();
 
-    let ty::ResolverOutputs {
+    let ResolverOutputs {
         global_ctxt: untracked_resolutions,
         ast_lowering: untracked_resolver_for_lowering,
     } = resolver.into_outputs();

compiler/rustc_middle/src/ty/codec.rs

@@ -510,12 +510,9 @@ impl_decodable_via_ref! {
     &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
     &'tcx traits::ImplSource<'tcx, ()>,
     &'tcx mir::Body<'tcx>,
-    &'tcx mir::ConcreteOpaqueTypes<'tcx>,
     &'tcx ty::List<ty::BoundVariableKind>,
     &'tcx ty::List<ty::Pattern<'tcx>>,
     &'tcx ty::ListWithCachedTypeInfo<ty::Clause<'tcx>>,
-    &'tcx ty::List<FieldIdx>,
-    &'tcx ty::List<(VariantIdx, FieldIdx)>,
 }
 
 #[macro_export]