Deal with fallout

compiler/rustc_codegen_cranelift/src/base.rs

@@ -706,7 +706,6 @@ fn codegen_stmt<'tcx>(
                     let times = fx
                         .monomorphize(times)
                         .eval(fx.tcx, ParamEnv::reveal_all())
-                        .kind()
                         .try_to_bits(fx.tcx.data_layout.pointer_size)
                         .unwrap();
                     if operand.layout().size.bytes() == 0 {

compiler/rustc_middle/src/mir/mod.rs

@@ -2329,7 +2329,7 @@ impl<'tcx> ConstantKind<'tcx> {
     pub fn eval(self, tcx: TyCtxt<'tcx>, param_env: ty::ParamEnv<'tcx>) -> Self {
         match self {
             Self::Ty(c) => {
-                if let Some(val) = c.kind().try_eval_for_mir(tcx, param_env) {
+                if let Some(val) = c.try_eval_for_mir(tcx, param_env) {
                     match val {
                         Ok(val) => Self::Val(val, c.ty()),
                         Err(guar) => Self::Ty(ty::Const::new_error(tcx, guar, self.ty())),
@@ -2867,7 +2867,7 @@ fn pretty_print_const_value<'tcx>(
                 }
             }
             (ConstValue::ByRef { alloc, offset }, ty::Array(t, n)) if *t == u8_type => {
-                let n = n.kind().try_to_bits(tcx.data_layout.pointer_size).unwrap();
+                let n = n.try_to_bits(tcx.data_layout.pointer_size).unwrap();
                 // cast is ok because we already checked for pointer size (32 or 64 bit) above
                 let range = AllocRange { start: offset, size: Size::from_bytes(n) };
                 let byte_str = alloc.inner().get_bytes_strip_provenance(&tcx, range).unwrap();

compiler/rustc_middle/src/ty/consts.rs

@@ -54,7 +54,7 @@ impl<'tcx> Const<'tcx> {
 
     #[inline]
     pub fn kind(self) -> ConstKind<'tcx> {
-        self.0.kind
+        self.0.kind.clone()
     }
 
     #[inline]

compiler/rustc_middle/src/ty/consts/kind.rs

@@ -1,7 +1,6 @@
 use super::Const;
 use crate::mir;
 use crate::ty::abstract_const::CastKind;
-use crate::ty::sty::ConstKind;
 use crate::ty::subst::SubstsRef;
 use crate::ty::{self, List, Ty};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
@@ -36,12 +35,6 @@ impl<'tcx> UnevaluatedConst<'tcx> {
     }
 }
 
-impl<'tcx> From<ty::ConstVid<'tcx>> for ConstKind<'tcx> {
-    fn from(const_vid: ty::ConstVid<'tcx>) -> Self {
-        InferConst::Var(const_vid).into()
-    }
-}
-
 #[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Hash)]
 #[derive(HashStable, TyEncodable, TyDecodable, TypeVisitable, TypeFoldable)]
 pub enum Expr<'tcx> {
@@ -55,7 +48,7 @@ pub enum Expr<'tcx> {
 static_assert_size!(Expr<'_>, 24);
 
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-static_assert_size!(ConstKind<'_>, 32);
+static_assert_size!(super::ConstKind<'_>, 32);
 
 /// An inference variable for a const, for use in const generics.
 #[derive(Copy, Clone, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Hash)]

compiler/rustc_middle/src/ty/inhabitedness/inhabited_predicate.rs

@@ -170,7 +170,7 @@ impl<'tcx> InhabitedPredicate<'tcx> {
         match self {
             Self::ConstIsZero(c) => {
                 let c = ty::EarlyBinder::bind(c).subst(tcx, substs);
-                let pred = match c.kind().try_to_target_usize(tcx) {
+                let pred = match c.try_to_target_usize(tcx) {
                     Some(0) => Self::True,
                     Some(1..) => Self::False,
                     None => Self::ConstIsZero(c),

compiler/rustc_middle/src/ty/inhabitedness/mod.rs

@@ -197,7 +197,7 @@ fn inhabited_predicate_type<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> InhabitedP
 
         // If we can evaluate the array length before having a `ParamEnv`, then
         // we can simplify the predicate. This is an optimization.
-        Array(ty, len) => match len.kind().try_to_target_usize(tcx) {
+        Array(ty, len) => match len.try_to_target_usize(tcx) {
             Some(0) => InhabitedPredicate::True,
             Some(1..) => ty.inhabited_predicate(tcx),
             None => ty.inhabited_predicate(tcx).or(tcx, InhabitedPredicate::ConstIsZero(len)),

compiler/rustc_middle/src/ty/mod.rs

@@ -66,6 +66,10 @@ use std::{fmt, str};
 
 pub use crate::ty::diagnostics::*;
 pub use rustc_type_ir::AliasKind::*;
+pub use rustc_type_ir::ConstKind::{
+    Bound as BoundCt, Error as ErrorCt, Expr as ExprCt, Infer as InferCt, Param as ParamCt,
+    Placeholder as PlaceholderCt, Unevaluated, Value,
+};
 pub use rustc_type_ir::DynKind::*;
 pub use rustc_type_ir::InferTy::*;
 pub use rustc_type_ir::RegionKind::*;

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -11,6 +11,7 @@ use crate::ty::{self, AliasTy, InferConst, Lift, Term, TermKind, Ty, TyCtxt};
 use rustc_hir::def::Namespace;
 use rustc_index::{Idx, IndexVec};
 use rustc_target::abi::TyAndLayout;
+use rustc_type_ir::ConstKind;
 
 use std::fmt;
 use std::ops::ControlFlow;
@@ -710,7 +711,18 @@ impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for ty::Const<'tcx> {
         folder: &mut F,
     ) -> Result<Self, F::Error> {
         let ty = self.ty().try_fold_with(folder)?;
-        let kind = self.kind().try_fold_with(folder)?;
+        let kind = match self.kind() {
+            ConstKind::Param(p) => ConstKind::Param(p.try_fold_with(folder)?),
+            ConstKind::Infer(i) => ConstKind::Infer(i.try_fold_with(folder)?),
+            ConstKind::Bound(d, b) => {
+                ConstKind::Bound(d.try_fold_with(folder)?, b.try_fold_with(folder)?)
+            }
+            ConstKind::Placeholder(p) => ConstKind::Placeholder(p.try_fold_with(folder)?),
+            ConstKind::Unevaluated(uv) => ConstKind::Unevaluated(uv.try_fold_with(folder)?),
+            ConstKind::Value(v) => ConstKind::Value(v.try_fold_with(folder)?),
+            ConstKind::Error(e) => ConstKind::Error(e.try_fold_with(folder)?),
+            ConstKind::Expr(e) => ConstKind::Expr(e.try_fold_with(folder)?),
+        };
         if ty != self.ty() || kind != self.kind() {
             Ok(folder.interner().mk_ct_from_kind(kind, ty))
         } else {
@@ -725,7 +737,19 @@ impl<'tcx> TypeSuperVisitable<TyCtxt<'tcx>> for ty::Const<'tcx> {
         visitor: &mut V,
     ) -> ControlFlow<V::BreakTy> {
         self.ty().visit_with(visitor)?;
-        self.kind().visit_with(visitor)
+        match self.kind() {
+            ConstKind::Param(p) => p.visit_with(visitor),
+            ConstKind::Infer(i) => i.visit_with(visitor),
+            ConstKind::Bound(d, b) => {
+                d.visit_with(visitor)?;
+                b.visit_with(visitor)
+            }
+            ConstKind::Placeholder(p) => p.visit_with(visitor),
+            ConstKind::Unevaluated(uv) => uv.visit_with(visitor),
+            ConstKind::Value(v) => v.visit_with(visitor),
+            ConstKind::Error(e) => e.visit_with(visitor),
+            ConstKind::Expr(e) => e.visit_with(visitor),
+        }
     }
 }
 

compiler/rustc_middle/src/ty/util.rs

@@ -1306,7 +1306,7 @@ pub fn needs_drop_components<'tcx>(
         ty::Array(elem_ty, size) => {
             match needs_drop_components(*elem_ty, target_layout) {
                 Ok(v) if v.is_empty() => Ok(v),
-                res => match size.kind().try_to_bits(target_layout.pointer_size) {
+                res => match size.try_to_bits(target_layout.pointer_size) {
                     // Arrays of size zero don't need drop, even if their element
                     // type does.
                     Some(0) => Ok(SmallVec::new()),

compiler/rustc_symbol_mangling/src/legacy.rs

@@ -230,7 +230,7 @@ impl<'tcx> Printer<'tcx> for &mut SymbolPrinter<'tcx> {
                 self.write_str("[")?;
                 self = self.print_type(ty)?;
                 self.write_str("; ")?;
-                if let Some(size) = size.kind().try_to_bits(self.tcx().data_layout.pointer_size) {
+                if let Some(size) = size.try_to_bits(self.tcx().data_layout.pointer_size) {
                     write!(self, "{size}")?
                 } else if let ty::ConstKind::Param(param) = size.kind() {
                     self = param.print(self)?

compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs

@@ -112,7 +112,7 @@ fn encode_const<'tcx>(
         let _ = write!(s, "{value}");
     }
 
-    if let Some(scalar_int) = c.kind().try_to_scalar_int() {
+    if let Some(scalar_int) = c.try_to_scalar_int() {
         let signed = c.ty().is_signed();
         match scalar_int.size().bits() {
             8 if signed => push_signed_value(&mut s, scalar_int.try_to_i8().unwrap(), 0),
@@ -504,8 +504,7 @@ fn encode_ty<'tcx>(
             let _ = write!(
                 s,
                 "{}",
-                &len.kind()
-                    .try_to_scalar()
+                &len.try_to_scalar()
                     .unwrap()
                     .to_u64()
                     .unwrap_or_else(|_| panic!("failed to convert length to u64"))
@@ -815,7 +814,6 @@ fn transform_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, options: TransformTyOptio
 
         ty::Array(ty0, len) => {
             let len = len
-                .kind()
                 .try_to_scalar()
                 .unwrap()
                 .to_u64()

compiler/rustc_symbol_mangling/src/v0.rs

@@ -651,7 +651,7 @@ impl<'tcx> Printer<'tcx> for &mut SymbolMangler<'tcx> {
                             .builtin_deref(true)
                             .expect("tried to dereference on non-ptr type")
                             .ty;
-                        // FIXME: add an assert that we only do this for valtrees.
+                        // FIXME(const_generics): add an assert that we only do this for valtrees.
                         let dereferenced_const = self.tcx.mk_ct_from_kind(ct.kind(), pointee_ty);
                         self = dereferenced_const.print(self)?;
                     }

compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs

@@ -278,7 +278,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             // Arrays give us `[]`, `[{ty}; _]` and `[{ty}; N]`
             if let ty::Array(aty, len) = self_ty.kind() {
                 flags.push((sym::_Self, Some("[]".to_string())));
-                let len = len.kind().try_to_value().and_then(|v| v.try_to_target_usize(self.tcx));
+                let len = len.try_to_value().and_then(|v| v.try_to_target_usize(self.tcx));
                 flags.push((sym::_Self, Some(format!("[{}; _]", aty))));
                 if let Some(n) = len {
                     flags.push((sym::_Self, Some(format!("[{}; {}]", aty, n))));

compiler/rustc_trait_selection/src/traits/fulfill.rs

@@ -528,7 +528,7 @@ impl<'a, 'tcx> ObligationProcessor for FulfillProcessor<'a, 'tcx> {
                         debug!("equating consts:\nc1= {:?}\nc2= {:?}", c1, c2);
 
                         use rustc_hir::def::DefKind;
-                        use ty::ConstKind::Unevaluated;
+                        use ty::Unevaluated;
                         match (c1.kind(), c2.kind()) {
                             (Unevaluated(a), Unevaluated(b))
                                 if a.def == b.def && tcx.def_kind(a.def) == DefKind::AssocConst =>

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -897,7 +897,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                         );
 
                         use rustc_hir::def::DefKind;
-                        use ty::ConstKind::Unevaluated;
+                        use ty::Unevaluated;
                         match (c1.kind(), c2.kind()) {
                             (Unevaluated(a), Unevaluated(b))
                                 if a.def == b.def && tcx.def_kind(a.def) == DefKind::AssocConst =>

src/tools/clippy/clippy_utils/src/consts.rs

@@ -689,7 +689,7 @@ pub fn miri_to_const<'tcx>(lcx: &LateContext<'tcx>, result: mir::ConstantKind<'t
         mir::ConstantKind::Val(ConstValue::ByRef { alloc, offset: _ }, _) => match result.ty().kind() {
             ty::Adt(adt_def, _) if adt_def.is_struct() => Some(Constant::Adt(result)),
             ty::Array(sub_type, len) => match sub_type.kind() {
-                ty::Float(FloatTy::F32) => match len.kind().try_to_target_usize(lcx.tcx) {
+                ty::Float(FloatTy::F32) => match len.try_to_target_usize(lcx.tcx) {
                     Some(len) => alloc
                         .inner()
                         .inspect_with_uninit_and_ptr_outside_interpreter(0..(4 * usize::try_from(len).unwrap()))
@@ -700,7 +700,7 @@ pub fn miri_to_const<'tcx>(lcx: &LateContext<'tcx>, result: mir::ConstantKind<'t
                         .map(Constant::Vec),
                     _ => None,
                 },
-                ty::Float(FloatTy::F64) => match len.kind().try_to_target_usize(lcx.tcx) {
+                ty::Float(FloatTy::F64) => match len.try_to_target_usize(lcx.tcx) {
                     Some(len) => alloc
                         .inner()
                         .inspect_with_uninit_and_ptr_outside_interpreter(0..(8 * usize::try_from(len).unwrap()))

tests/mir-opt/issue_99325.main.built.after.mir

@@ -2,7 +2,7 @@
 
 | User Type Annotations
 | 0: user_ty: Canonical { value: TypeOf(DefId(0:3 ~ issue_99325[22bb]::function_with_bytes), UserSubsts { substs: [Const { ty: &'static [u8; 4], kind: Branch([Leaf(0x41), Leaf(0x41), Leaf(0x41), Leaf(0x41)]) }], user_self_ty: None }), max_universe: U0, variables: [] }, span: $DIR/issue_99325.rs:10:16: 10:46, inferred_ty: fn() -> &'static [u8] {function_with_bytes::<&*b"AAAA">}
-| 1: user_ty: Canonical { value: TypeOf(DefId(0:3 ~ issue_99325[22bb]::function_with_bytes), UserSubsts { substs: [Const { ty: &'static [u8; 4], kind: Unevaluated([], DefId(0:8 ~ issue_99325[22bb]::main::{constant#1})) }], user_self_ty: None }), max_universe: U0, variables: [] }, span: $DIR/issue_99325.rs:11:16: 11:68, inferred_ty: fn() -> &'static [u8] {function_with_bytes::<&*b"AAAA">}
+| 1: user_ty: Canonical { value: TypeOf(DefId(0:3 ~ issue_99325[22bb]::function_with_bytes), UserSubsts { substs: [Const { ty: &'static [u8; 4], kind: UnevaluatedConst { def: DefId(0:8 ~ issue_99325[22bb]::main::{constant#1}), substs: [] } }], user_self_ty: None }), max_universe: U0, variables: [] }, span: $DIR/issue_99325.rs:11:16: 11:68, inferred_ty: fn() -> &'static [u8] {function_with_bytes::<&*b"AAAA">}
 |
 fn main() -> () {
     let mut _0: ();