Add `Ty` to `ConstKind::Value`

compiler/rustc_codegen_llvm/src/intrinsic.rs

@@ -1201,6 +1201,7 @@ fn generic_simd_intrinsic<'ll, 'tcx>(
             .expect_const()
             .eval(tcx, ty::ParamEnv::reveal_all(), span)
             .unwrap()
+            .1
             .unwrap_branch();
         let n = idx.len() as u64;
 

compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs

@@ -693,42 +693,46 @@ fn push_const_param<'tcx>(tcx: TyCtxt<'tcx>, ct: ty::Const<'tcx>, output: &mut S
         ty::ConstKind::Param(param) => {
             write!(output, "{}", param.name)
         }
-        // THISPR
+        ty::ConstKind::Value(ty, _) => {
-        _ => match { todo!() as Ty<'tcx> }.kind() {
+            match ty.kind() {
-            ty::Int(ity) => {
+                ty::Int(ity) => {
-                let bits = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
+                    // FIXME: directly extract the bits from a valtree instead of evaluating an
-                let val = Integer::from_int_ty(&tcx, *ity).size().sign_extend(bits) as i128;
+                    // alreay evaluated `Const` in order to get the bits.
-                write!(output, "{val}")
+                    let bits = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
-            }
+                    let val = Integer::from_int_ty(&tcx, *ity).size().sign_extend(bits) as i128;
-            ty::Uint(_) => {
+                    write!(output, "{val}")
-                let val = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
+                }
-                write!(output, "{val}")
+                ty::Uint(_) => {
-            }
+                    let val = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
-            ty::Bool => {
+                    write!(output, "{val}")
-                let val = ct.try_eval_bool(tcx, ty::ParamEnv::reveal_all()).unwrap();
+                }
-                write!(output, "{val}")
+                ty::Bool => {
-            }
+                    let val = ct.try_eval_bool(tcx, ty::ParamEnv::reveal_all()).unwrap();
-            _ => {
+                    write!(output, "{val}")
-                // If we cannot evaluate the constant to a known type, we fall back
+                }
-                // to emitting a stable hash value of the constant. This isn't very pretty
+                _ => {
-                // but we get a deterministic, virtually unique value for the constant.
+                    // If we cannot evaluate the constant to a known type, we fall back
-                //
+                    // to emitting a stable hash value of the constant. This isn't very pretty
-                // Let's only emit 64 bits of the hash value. That should be plenty for
+                    // but we get a deterministic, virtually unique value for the constant.
-                // avoiding collisions and will make the emitted type names shorter.
+                    //
-                let hash_short = tcx.with_stable_hashing_context(|mut hcx| {
+                    // Let's only emit 64 bits of the hash value. That should be plenty for
-                    let mut hasher = StableHasher::new();
+                    // avoiding collisions and will make the emitted type names shorter.
-                    let ct = ct.eval(tcx, ty::ParamEnv::reveal_all(), DUMMY_SP).unwrap();
+                    let hash_short = tcx.with_stable_hashing_context(|mut hcx| {
-                    hcx.while_hashing_spans(false, |hcx| ct.hash_stable(hcx, &mut hasher));
+                        let mut hasher = StableHasher::new();
-                    hasher.finish::<Hash64>()
+                        let ct = ct.eval(tcx, ty::ParamEnv::reveal_all(), DUMMY_SP).unwrap();
-                });
+                        hcx.while_hashing_spans(false, |hcx| ct.hash_stable(hcx, &mut hasher));
+                        hasher.finish::<Hash64>()
+                    });
 
-                if cpp_like_debuginfo(tcx) {
+                    if cpp_like_debuginfo(tcx) {
-                    write!(output, "CONST${hash_short:x}")
+                        write!(output, "CONST${hash_short:x}")
-                } else {
+                    } else {
-                    write!(output, "{{CONST#{hash_short:x}}}")
+                        write!(output, "{{CONST#{hash_short:x}}}")
+                    }
                 }
             }
-        },
+        }
+        _ => bug!("Invalid `Const` during codegen: {:?}", ct),
     }
     .unwrap();
 }

compiler/rustc_codegen_ssa/src/mir/constant.rs

@@ -43,7 +43,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             mir::Const::Ty(c) => match c.kind() {
                 // A constant that came from a const generic but was then used as an argument to old-style
                 // simd_shuffle (passing as argument instead of as a generic param).
-                rustc_type_ir::ConstKind::Value(valtree) => return Ok(Some(valtree)),
+                rustc_type_ir::ConstKind::Value(_, valtree) => return Ok(Some(valtree)),
                 other => span_bug!(constant.span, "{other:#?}"),
             },
             // We should never encounter `Const::Val` unless MIR opts (like const prop) evaluate

compiler/rustc_const_eval/src/check_consts/qualifs.rs

@@ -360,7 +360,7 @@ where
         Const::Ty(ct)
             if matches!(
                 ct.kind(),
-                ty::ConstKind::Param(_) | ty::ConstKind::Error(_) | ty::ConstKind::Value(_)
+                ty::ConstKind::Param(_) | ty::ConstKind::Error(_) | ty::ConstKind::Value(_, _)
             ) =>
         {
             None

compiler/rustc_hir_typeck/src/pat.rs

@@ -2409,7 +2409,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         min_len: u64,
     ) -> (Option<Ty<'tcx>>, Ty<'tcx>) {
         let len = match len.eval(self.tcx, self.param_env, span) {
-            Ok(val) => val
+            // FIXME(BoxyUwU): Assert the `Ty` is a `usize`?
+            Ok((_, val)) => val
                 .try_to_scalar()
                 .and_then(|scalar| scalar.try_to_int().ok())
                 .and_then(|int| int.try_to_target_usize(self.tcx).ok()),

compiler/rustc_infer/src/infer/freshen.rs

@@ -176,7 +176,7 @@ impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for TypeFreshener<'a, 'tcx> {
             }
 
             ty::ConstKind::Param(_)
-            | ty::ConstKind::Value(_)
+            | ty::ConstKind::Value(_, _)
             | ty::ConstKind::Unevaluated(..)
             | ty::ConstKind::Expr(..)
             | ty::ConstKind::Error(_) => ct.super_fold_with(self),

compiler/rustc_infer/src/infer/mod.rs

@@ -1299,7 +1299,7 @@ impl<'tcx> InferCtxt<'tcx> {
             | ty::ConstKind::Bound(_, _)
             | ty::ConstKind::Placeholder(_)
             | ty::ConstKind::Unevaluated(_)
-            | ty::ConstKind::Value(_)
+            | ty::ConstKind::Value(_, _)
             | ty::ConstKind::Error(_)
             | ty::ConstKind::Expr(_) => ct,
         }
@@ -1514,8 +1514,11 @@ impl<'tcx> InferCtxt<'tcx> {
         span: Span,
     ) -> Result<ty::Const<'tcx>, ErrorHandled> {
         match self.const_eval_resolve(param_env, unevaluated, span) {
-            // THISPR
+            Ok(Some(val)) => Ok(ty::Const::new_value(
-            Ok(Some(val)) => Ok(ty::Const::new_value(self.tcx, val, todo!())),
+                self.tcx,
+                val,
+                self.tcx.type_of(unevaluated.def).instantiate(self.tcx, unevaluated.args),
+            )),
             Ok(None) => {
                 let tcx = self.tcx;
                 let def_id = unevaluated.def;

compiler/rustc_middle/src/mir/consts.rs

@@ -249,7 +249,7 @@ impl<'tcx> Const<'tcx> {
     pub fn is_required_const(&self) -> bool {
         match self {
             Const::Ty(c) => match c.kind() {
-                ty::ConstKind::Value(_) => false, // already a value, cannot error
+                ty::ConstKind::Value(_, _) => false, // already a value, cannot error
                 _ => true,
             },
             Const::Val(..) => false, // already a value, cannot error
@@ -261,9 +261,7 @@ impl<'tcx> Const<'tcx> {
     pub fn try_to_scalar(self) -> Option<Scalar> {
         match self {
             Const::Ty(c) => match c.kind() {
-                // THISPR
+                ty::ConstKind::Value(ty, valtree) if ty.is_primitive() => {
-                // if c.ty().is_primitive()
-                ty::ConstKind::Value(valtree) if todo!() => {
                     // A valtree of a type where leaves directly represent the scalar const value.
                     // Just checking whether it is a leaf is insufficient as e.g. references are leafs
                     // but the leaf value is the value they point to, not the reference itself!
@@ -282,9 +280,9 @@ impl<'tcx> Const<'tcx> {
         match self {
             Const::Val(ConstValue::Scalar(Scalar::Int(x)), _) => Some(x),
             Const::Ty(c) => match c.kind() {
-                // THISPR
+                ty::ConstKind::Value(ty, valtree) if ty.is_primitive() => {
-                // if c.ty().is_primitive()
+                    Some(valtree.unwrap_leaf())
-                ty::ConstKind::Value(valtree) if todo!() => Some(valtree.unwrap_leaf()),
+                }
                 _ => None,
             },
             _ => None,
@@ -312,8 +310,8 @@ impl<'tcx> Const<'tcx> {
             Const::Ty(c) => {
                 // We want to consistently have a "clean" value for type system constants (i.e., no
                 // data hidden in the padding), so we always go through a valtree here.
-                let val = c.eval(tcx, param_env, span)?;
+                let (ty, val) = c.eval(tcx, param_env, span)?;
-                Ok(tcx.valtree_to_const_val((self.ty(), val)))
+                Ok(tcx.valtree_to_const_val((ty, val)))
             }
             Const::Unevaluated(uneval, _) => {
                 // FIXME: We might want to have a `try_eval`-like function on `Unevaluated`
@@ -341,17 +339,16 @@ impl<'tcx> Const<'tcx> {
         tcx: TyCtxt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
     ) -> Option<Scalar> {
-        match self {
+        if let Const::Ty(c) = self
-            // THISPR
+            && let ty::ConstKind::Value(ty, val) = c.kind()
-            // c.ty().is_primitive()
+            && ty.is_primitive()
-            Const::Ty(c) if todo!() => {
+        {
-                // Avoid the `valtree_to_const_val` query. Can only be done on primitive types that
+            // Avoid the `valtree_to_const_val` query. Can only be done on primitive types that
-                // are valtree leaves, and *not* on references. (References should return the
+            // are valtree leaves, and *not* on references. (References should return the
-                // pointer here, which valtrees don't represent.)
+            // pointer here, which valtrees don't represent.)
-                let val = c.eval(tcx, param_env, DUMMY_SP).ok()?;
+            Some(val.unwrap_leaf().into())
-                Some(val.unwrap_leaf().into())
+        } else {
-            }
+            self.eval(tcx, param_env, DUMMY_SP).ok()?.try_to_scalar()
-            _ => self.eval(tcx, param_env, DUMMY_SP).ok()?.try_to_scalar(),
         }
     }
 
@@ -446,11 +443,10 @@ impl<'tcx> Const<'tcx> {
 
     pub fn from_ty_const(c: ty::Const<'tcx>, tcx: TyCtxt<'tcx>) -> Self {
         match c.kind() {
-            ty::ConstKind::Value(valtree) => {
+            ty::ConstKind::Value(ty, valtree) => {
                 // Make sure that if `c` is normalized, then the return value is normalized.
-                // THISPR
+                let const_val = tcx.valtree_to_const_val((ty, valtree));
-                let const_val = tcx.valtree_to_const_val((todo!(), valtree));
+                Self::Val(const_val, ty)
-                Self::Val(const_val, todo!())
             }
             _ => Self::Ty(c),
         }
@@ -469,9 +465,7 @@ impl<'tcx> Const<'tcx> {
                 // A valtree may be a reference. Valtree references correspond to a
                 // different allocation each time they are evaluated. Valtrees for primitive
                 // types are fine though.
-                // THISPR
+                ty::ConstKind::Value(ty, _) => ty.is_primitive(),
-                // c.ty().is_primitive()
-                ty::ConstKind::Value(_) => todo!(),
                 ty::ConstKind::Unevaluated(..) | ty::ConstKind::Expr(..) => false,
                 // This can happen if evaluation of a constant failed. The result does not matter
                 // much since compilation is doomed.

compiler/rustc_middle/src/mir/pretty.rs

@@ -1318,7 +1318,7 @@ impl<'tcx> Visitor<'tcx> for ExtraComments<'tcx> {
                     ty::ConstKind::Unevaluated(uv) => {
                         format!("ty::Unevaluated({}, {:?})", self.tcx.def_path_str(uv.def), uv.args,)
                     }
-                    ty::ConstKind::Value(val) => format!("ty::Valtree({})", fmt_valtree(&val)),
+                    ty::ConstKind::Value(_, val) => format!("ty::Valtree({})", fmt_valtree(&val)),
                     // No `ty::` prefix since we also use this to represent errors from `mir::Unevaluated`.
                     ty::ConstKind::Error(_) => "Error".to_string(),
                     // These variants shouldn't exist in the MIR.

compiler/rustc_middle/src/ty/consts.rs

@@ -24,7 +24,7 @@ pub type ConstKind<'tcx> = ir::ConstKind<TyCtxt<'tcx>>;
 pub type UnevaluatedConst<'tcx> = ir::UnevaluatedConst<TyCtxt<'tcx>>;
 
 #[cfg(target_pointer_width = "64")]
-rustc_data_structures::static_assert_size!(ConstKind<'_>, 24);
+rustc_data_structures::static_assert_size!(ConstKind<'_>, 32);
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash, HashStable)]
 #[rustc_pass_by_value]
@@ -168,10 +168,6 @@ impl<'tcx> rustc_type_ir::inherent::Const<TyCtxt<'tcx>> for Const<'tcx> {
     fn new_unevaluated(interner: TyCtxt<'tcx>, uv: ty::UnevaluatedConst<'tcx>) -> Self {
         Const::new_unevaluated(interner, uv)
     }
-
-    fn ty(self) -> Ty<'tcx> {
-        self.ty()
-    }
 }
 
 impl<'tcx> Const<'tcx> {
@@ -311,7 +307,7 @@ impl<'tcx> Const<'tcx> {
         tcx: TyCtxt<'tcx>,
         param_env: ParamEnv<'tcx>,
         span: Span,
-    ) -> Result<ValTree<'tcx>, ErrorHandled> {
+    ) -> Result<(Ty<'tcx>, ValTree<'tcx>), ErrorHandled> {
         assert!(!self.has_escaping_bound_vars(), "escaping vars in {self:?}");
         match self.kind() {
             ConstKind::Unevaluated(unevaluated) => {
@@ -329,9 +325,9 @@ impl<'tcx> Const<'tcx> {
                     );
                     return Err(e.into());
                 };
-                Ok(c)
+                Ok((tcx.type_of(unevaluated.def).instantiate(tcx, unevaluated.args), c))
             }
-            ConstKind::Value(val) => Ok(val),
+            ConstKind::Value(ty, val) => Ok((ty, val)),
             ConstKind::Error(g) => Err(g.into()),
             ConstKind::Param(_)
             | ConstKind::Infer(_)
@@ -345,7 +341,7 @@ impl<'tcx> Const<'tcx> {
     #[inline]
     pub fn normalize(self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Self {
         match self.eval(tcx, param_env, DUMMY_SP) {
-            Ok(val) => Self::new_value(tcx, val, self.ty_for_ctfe(tcx).unwrap()),
+            Ok((ty, val)) => Self::new_value(tcx, val, ty),
             Err(ErrorHandled::Reported(r, _span)) => Self::new_error(tcx, r.into()),
             Err(ErrorHandled::TooGeneric(_span)) => self,
         }
@@ -356,8 +352,10 @@ impl<'tcx> Const<'tcx> {
         self,
         tcx: TyCtxt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
-    ) -> Option<Scalar> {
+    ) -> Option<(Ty<'tcx>, Scalar)> {
-        self.eval(tcx, param_env, DUMMY_SP).ok()?.try_to_scalar()
+        let (ty, val) = self.eval(tcx, param_env, DUMMY_SP).ok()?;
+        let val = val.try_to_scalar()?;
+        Some((ty, val))
     }
 
     #[inline]
@@ -368,8 +366,10 @@ impl<'tcx> Const<'tcx> {
         self,
         tcx: TyCtxt<'tcx>,
         param_env: ParamEnv<'tcx>,
-    ) -> Option<ScalarInt> {
+    ) -> Option<(Ty<'tcx>, ScalarInt)> {
-        self.try_eval_scalar(tcx, param_env)?.try_to_int().ok()
+        let (ty, scalar) = self.try_eval_scalar(tcx, param_env)?;
+        let val = scalar.try_to_int().ok()?;
+        Some((ty, val))
     }
 
     #[inline]
@@ -377,15 +377,10 @@ impl<'tcx> Const<'tcx> {
     /// generics (or erroneous code) or if the value can't be represented as bits (e.g. because it
     /// contains const generic parameters or pointers).
     pub fn try_eval_bits(self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Option<u128> {
-        let int = self.try_eval_scalar_int(tcx, param_env)?;
+        let (ty, scalar) = self.try_eval_scalar_int(tcx, param_env)?;
-        let size = tcx
+        let size = tcx.layout_of(param_env.with_reveal_all_normalized(tcx).and(ty)).ok()?.size;
-            .layout_of(
-                param_env.with_reveal_all_normalized(tcx).and(self.ty_for_ctfe(tcx).unwrap()),
-            )
-            .ok()?
-            .size;
         // if `ty` does not depend on generic parameters, use an empty param_env
-        int.try_to_bits(size).ok()
+        scalar.try_to_bits(size).ok()
     }
 
     #[inline]
@@ -401,12 +396,14 @@ impl<'tcx> Const<'tcx> {
         tcx: TyCtxt<'tcx>,
         param_env: ParamEnv<'tcx>,
     ) -> Option<u64> {
-        self.try_eval_scalar_int(tcx, param_env)?.try_to_target_usize(tcx).ok()
+        let (_, scalar) = self.try_eval_scalar_int(tcx, param_env)?;
+        scalar.try_to_target_usize(tcx).ok()
     }
 
     #[inline]
     pub fn try_eval_bool(self, tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>) -> Option<bool> {
-        self.try_eval_scalar_int(tcx, param_env)?.try_into().ok()
+        let (_, scalar) = self.try_eval_scalar_int(tcx, param_env)?;
+        scalar.try_into().ok()
     }
 
     #[inline]
@@ -419,7 +416,7 @@ impl<'tcx> Const<'tcx> {
     /// Panics if self.kind != ty::ConstKind::Value
     pub fn to_valtree(self) -> ty::ValTree<'tcx> {
         match self.kind() {
-            ty::ConstKind::Value(valtree) => valtree,
+            ty::ConstKind::Value(_, valtree) => valtree,
             _ => bug!("expected ConstKind::Value, got {:?}", self.kind()),
         }
     }
@@ -427,7 +424,7 @@ impl<'tcx> Const<'tcx> {
     /// Attempts to convert to a `ValTree`
     pub fn try_to_valtree(self) -> Option<ty::ValTree<'tcx>> {
         match self.kind() {
-            ty::ConstKind::Value(valtree) => Some(valtree),
+            ty::ConstKind::Value(_, valtree) => Some(valtree),
             _ => None,
         }
     }

compiler/rustc_middle/src/ty/context.rs

@@ -601,9 +601,15 @@ impl<'tcx> CommonConsts<'tcx> {
         };
 
         CommonConsts {
-            unit: mk_const(ty::ConstKind::Value(ty::ValTree::zst())),
+            unit: mk_const(ty::ConstKind::Value(types.unit, ty::ValTree::zst())),
-            true_: mk_const(ty::ConstKind::Value(ty::ValTree::Leaf(ty::ScalarInt::TRUE))),
+            true_: mk_const(ty::ConstKind::Value(
-            false_: mk_const(ty::ConstKind::Value(ty::ValTree::Leaf(ty::ScalarInt::FALSE))),
+                types.bool,
+                ty::ValTree::Leaf(ty::ScalarInt::TRUE),
+            )),
+            false_: mk_const(ty::ConstKind::Value(
+                types.bool,
+                ty::ValTree::Leaf(ty::ScalarInt::FALSE),
+            )),
         }
     }
 }

compiler/rustc_middle/src/ty/fast_reject.rs

@@ -337,7 +337,7 @@ impl DeepRejectCtxt {
             | ty::ConstKind::Error(_) => {
                 return true;
             }
-            ty::ConstKind::Value(impl_val) => impl_val,
+            ty::ConstKind::Value(_, impl_val) => impl_val,
             ty::ConstKind::Infer(_) | ty::ConstKind::Bound(..) | ty::ConstKind::Placeholder(_) => {
                 bug!("unexpected impl arg: {:?}", impl_ct)
             }
@@ -357,7 +357,7 @@ impl DeepRejectCtxt {
             ty::ConstKind::Expr(_) | ty::ConstKind::Unevaluated(_) | ty::ConstKind::Error(_) => {
                 true
             }
-            ty::ConstKind::Value(obl_val) => obl_val == impl_val,
+            ty::ConstKind::Value(_, obl_val) => obl_val == impl_val,
 
             ty::ConstKind::Infer(_) => true,
 

compiler/rustc_middle/src/ty/flags.rs

@@ -372,7 +372,7 @@ impl FlagComputation {
                 self.add_flags(TypeFlags::HAS_CT_PLACEHOLDER);
                 self.add_flags(TypeFlags::STILL_FURTHER_SPECIALIZABLE);
             }
-            ty::ConstKind::Value(_) => {}
+            ty::ConstKind::Value(ty, _) => self.add_ty(ty),
             ty::ConstKind::Expr(e) => self.add_args(e.args()),
             ty::ConstKind::Error(_) => self.add_flags(TypeFlags::HAS_ERROR),
         }

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -1511,8 +1511,8 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
                 _ => print_underscore!(),
             },
             ty::ConstKind::Param(ParamConst { name, .. }) => p!(write("{}", name)),
-            ty::ConstKind::Value(value) => {
+            ty::ConstKind::Value(ty, value) => {
-                return self.pretty_print_const_valtree(value, todo!(), print_ty);
+                return self.pretty_print_const_valtree(value, ty, print_ty);
             }
 
             ty::ConstKind::Bound(debruijn, bound_var) => {
@@ -1666,7 +1666,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
             ty::Ref(_, inner, _) => {
                 if let ty::Array(elem, len) = inner.kind() {
                     if let ty::Uint(ty::UintTy::U8) = elem.kind() {
-                        if let ty::ConstKind::Value(ty::ValTree::Leaf(int)) = len.kind() {
+                        if let ty::ConstKind::Value(_, ty::ValTree::Leaf(int)) = len.kind() {
                             match self.tcx().try_get_global_alloc(prov.alloc_id()) {
                                 Some(GlobalAlloc::Memory(alloc)) => {
                                     let len = int.assert_bits(self.tcx().data_layout.pointer_size);

compiler/rustc_middle/src/ty/relate.rs

@@ -646,7 +646,7 @@ pub fn structurally_relate_consts<'tcx, R: TypeRelation<'tcx>>(
             true
         }
         (ty::ConstKind::Placeholder(p1), ty::ConstKind::Placeholder(p2)) => p1 == p2,
-        (ty::ConstKind::Value(a_val), ty::ConstKind::Value(b_val)) => a_val == b_val,
+        (ty::ConstKind::Value(_, a_val), ty::ConstKind::Value(_, b_val)) => a_val == b_val,
 
         // While this is slightly incorrect, it shouldn't matter for `min_const_generics`
         // and is the better alternative to waiting until `generic_const_exprs` can

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -201,18 +201,16 @@ impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for ty::Const<'tcx> {
         f: &mut core::fmt::Formatter<'_>,
     ) -> core::fmt::Result {
         // If this is a value, we spend some effort to make it look nice.
-        if let ConstKind::Value(_) = this.data.kind() {
+        if let ConstKind::Value(_, _) = this.data.kind() {
             return ty::tls::with(move |tcx| {
                 // Somehow trying to lift the valtree results in lifetime errors, so we lift the
                 // entire constant.
                 let lifted = tcx.lift(*this.data).unwrap();
-                let ConstKind::Value(valtree) = lifted.kind() else {
+                let ConstKind::Value(ty, valtree) = lifted.kind() else {
                     bug!("we checked that this is a valtree")
                 };
                 let mut cx = FmtPrinter::new(tcx, Namespace::ValueNS);
-                // THISPR
+                cx.pretty_print_const_valtree(valtree, ty, /*print_ty*/ true)?;
-                todo!();
-                // cx.pretty_print_const_valtree(valtree, lifted.ty(), /*print_ty*/ true)?;
                 f.write_str(&cx.into_buffer())
             });
         }
@@ -652,7 +650,9 @@ impl<'tcx> TypeSuperFoldable<TyCtxt<'tcx>> for ty::Const<'tcx> {
             }
             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::Value(t, v) => {
+                ConstKind::Value(t.try_fold_with(folder)?, 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)?),
         };
@@ -671,7 +671,10 @@ impl<'tcx> TypeSuperVisitable<TyCtxt<'tcx>> for ty::Const<'tcx> {
             }
             ConstKind::Placeholder(p) => p.visit_with(visitor),
             ConstKind::Unevaluated(uv) => uv.visit_with(visitor),
-            ConstKind::Value(v) => v.visit_with(visitor),
+            ConstKind::Value(t, v) => {
+                try_visit!(t.visit_with(visitor));
+                v.visit_with(visitor)
+            }
             ConstKind::Error(e) => e.visit_with(visitor),
             ConstKind::Expr(e) => e.visit_with(visitor),
         }

compiler/rustc_middle/src/ty/walk.rs

@@ -217,9 +217,10 @@ fn push_inner<'tcx>(stack: &mut TypeWalkerStack<'tcx>, parent: GenericArg<'tcx>)
             | ty::ConstKind::Param(_)
             | ty::ConstKind::Placeholder(_)
             | ty::ConstKind::Bound(..)
-            | ty::ConstKind::Value(_)
             | ty::ConstKind::Error(_) => {}
 
+            ty::ConstKind::Value(ty, _) => stack.push(ty.into()),
+
             ty::ConstKind::Expr(expr) => stack.extend(expr.args().iter().rev()),
             ty::ConstKind::Unevaluated(ct) => {
                 stack.extend(ct.args.iter().rev());

compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs

@@ -101,7 +101,7 @@ impl<'tcx> ConstToPat<'tcx> {
         // level of indirection can be eliminated
 
         let have_valtree =
-            matches!(cv, mir::Const::Ty(c) if matches!(c.kind(), ty::ConstKind::Value(_)));
+            matches!(cv, mir::Const::Ty(c) if matches!(c.kind(), ty::ConstKind::Value(_, _)));
         let inlined_const_as_pat = match cv {
             mir::Const::Ty(c) => match c.kind() {
                 ty::ConstKind::Param(_)
@@ -113,8 +113,8 @@ impl<'tcx> ConstToPat<'tcx> {
                 | ty::ConstKind::Expr(_) => {
                     span_bug!(self.span, "unexpected const in `to_pat`: {:?}", c.kind())
                 }
-                ty::ConstKind::Value(valtree) => {
+                ty::ConstKind::Value(ty, valtree) => {
-                    self.recur(valtree, cv.ty()).unwrap_or_else(|_: FallbackToOpaqueConst| {
+                    self.recur(valtree, ty).unwrap_or_else(|_: FallbackToOpaqueConst| {
                         Box::new(Pat {
                             span: self.span,
                             ty: cv.ty(),

compiler/rustc_next_trait_solver/src/canonicalizer.rs

@@ -416,7 +416,7 @@ impl<Infcx: InferCtxtLike<Interner = I>, I: Interner> TypeFolder<I>
             // FIXME: See comment above -- we could fold the region separately or something.
             ty::ConstKind::Bound(_, _)
             | ty::ConstKind::Unevaluated(_)
-            | ty::ConstKind::Value(_)
+            | ty::ConstKind::Value(_, _)
             | ty::ConstKind::Error(_)
             | ty::ConstKind::Expr(_) => return c.super_fold_with(self),
         };

compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs

@@ -116,12 +116,10 @@ fn encode_const<'tcx>(
         }
 
         // Literal arguments
-        ty::ConstKind::Value(..) => {
+        ty::ConstKind::Value(ct_ty, ..) => {
             // L<element-type>[n]<element-value>E as literal argument
 
             // Element type
-            // THISPR
-            let ct_ty: Ty<'tcx> = todo!();
             s.push_str(&encode_ty(tcx, ct_ty, dict, options));
 
             // The only allowed types of const values are bool, u8, u16, u32,

compiler/rustc_smir/src/rustc_smir/convert/ty.rs

@@ -415,7 +415,7 @@ pub fn mir_const_from_ty_const<'tcx>(
     ty: Ty<'tcx>,
 ) -> stable_mir::ty::MirConst {
     let kind = match ty_const.kind() {
-        ty::Value(val) => {
+        ty::Value(ty, val) => {
             let val = match val {
                 ty::ValTree::Leaf(scalar) => ty::ValTree::Leaf(scalar),
                 ty::ValTree::Branch(branch) => {
@@ -456,7 +456,7 @@ impl<'tcx> Stable<'tcx> for ty::Const<'tcx> {
 
     fn stable(&self, tables: &mut Tables<'_>) -> Self::T {
         let kind = match self.kind() {
-            ty::Value(val) => {
+            ty::Value(ty, val) => {
                 let val = match val {
                     ty::ValTree::Leaf(scalar) => ty::ValTree::Leaf(scalar),
                     ty::ValTree::Branch(branch) => {
@@ -464,9 +464,7 @@ impl<'tcx> Stable<'tcx> for ty::Const<'tcx> {
                     }
                 };
 
-                // THISPR
+                let ty = tables.tcx.lift(ty).unwrap();
-                let ty = todo!();
-                // let ty = tables.tcx.lift(c.ty()).unwrap();
                 let const_val = tables.tcx.valtree_to_const_val((ty, val));
                 if matches!(const_val, mir::ConstValue::ZeroSized) {
                     stable_mir::ty::TyConstKind::ZSTValue(ty.stable(tables))

compiler/rustc_symbol_mangling/src/legacy.rs

@@ -269,21 +269,16 @@ impl<'tcx> Printer<'tcx> for SymbolPrinter<'tcx> {
     }
 
     fn print_const(&mut self, ct: ty::Const<'tcx>) -> Result<(), PrintError> {
-        // THISPR
-        let ct_ty: Ty<'tcx> = todo!();
-
         // only print integers
-        match (ct.kind(), ct_ty.kind()) {
+        match ct.kind() {
-            (ty::ConstKind::Value(ty::ValTree::Leaf(scalar)), ty::Int(_) | ty::Uint(_)) => {
+            ty::ConstKind::Value(ty, ty::ValTree::Leaf(scalar)) if ty.is_integral() => {
                 // The `pretty_print_const` formatting depends on -Zverbose-internals
                 // flag, so we cannot reuse it here.
-                let signed = matches!(ct_ty.kind(), ty::Int(_));
+                let signed = matches!(ty.kind(), ty::Int(_));
                 write!(
                     self,
                     "{:#?}",
-                    // THISPR
+                    ty::ConstInt::new(scalar, signed, ty.is_ptr_sized_integral())
-                    // ct.ty().is_ptr_sized_integral()
-                    ty::ConstInt::new(scalar, signed, todo!())
                 )?;
             }
             _ => self.write_str("_")?,

compiler/rustc_symbol_mangling/src/v0.rs

@@ -541,8 +541,8 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
     fn print_const(&mut self, ct: ty::Const<'tcx>) -> Result<(), PrintError> {
         // We only mangle a typed value if the const can be evaluated.
         let ct = ct.normalize(self.tcx, ty::ParamEnv::reveal_all());
-        match ct.kind() {
+        let (ct_ty, valtree) = match ct.kind() {
-            ty::ConstKind::Value(_) => {}
+            ty::ConstKind::Value(ty, val) => (ty, val),
 
             // Placeholders (should be demangled as `_`).
             // NOTE(eddyb) despite `Unevaluated` having a `DefId` (and therefore
@@ -559,7 +559,7 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
                 self.push("p");
                 return Ok(());
             }
-        }
+        };
 
         if let Some(&i) = self.consts.get(&ct) {
             self.print_backref(i)?;
@@ -567,18 +567,15 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
         }
 
         let start = self.out.len();
-        // THISPR
-        let ty: Ty<'tcx> = todo!();
-        // let ty = ct.ty();
 
-        match ty.kind() {
+        match ct_ty.kind() {
             ty::Uint(_) | ty::Int(_) | ty::Bool | ty::Char => {
-                ty.print(self)?;
+                ct_ty.print(self)?;
 
                 let mut bits = ct.eval_bits(self.tcx, ty::ParamEnv::reveal_all());
 
                 // Negative integer values are mangled using `n` as a "sign prefix".
-                if let ty::Int(ity) = ty.kind() {
+                if let ty::Int(ity) = ct_ty.kind() {
                     let val =
                         Integer::from_int_ty(&self.tcx, *ity).size().sign_extend(bits) as i128;
                     if val < 0 {
@@ -600,38 +597,32 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
 
                 match inner_ty.kind() {
                     ty::Str if mutbl.is_not() => {
-                        match ct.kind() {
+                        let slice =
-                            ty::ConstKind::Value(valtree) => {
+                            valtree.try_to_raw_bytes(self.tcx(), ct_ty).unwrap_or_else(|| {
-                                let slice =
+                                bug!(
-                                    valtree.try_to_raw_bytes(self.tcx(), ty).unwrap_or_else(|| {
+                                    "expected to get raw bytes from valtree {:?} for type {:}",
-                                        bug!(
+                                    valtree,
-                                        "expected to get raw bytes from valtree {:?} for type {:}",
+                                    ct_ty
-                                        valtree, ty
+                                )
-                                    )
+                            });
-                                    });
+                        let s =
-                                let s = std::str::from_utf8(slice)
+                            std::str::from_utf8(slice).expect("non utf8 str from MIR interpreter");
-                                    .expect("non utf8 str from MIR interpreter");
 
-                                self.push("e");
+                        self.push("e");
 
-                                // FIXME(eddyb) use a specialized hex-encoding loop.
+                        // FIXME(eddyb) use a specialized hex-encoding loop.
-                                for byte in s.bytes() {
+                        for byte in s.bytes() {
-                                    let _ = write!(self.out, "{byte:02x}");
+                            let _ = write!(self.out, "{byte:02x}");
-                                }
-
-                                self.push("_");
-                            }
-
-                            _ => {
-                                bug!("symbol_names: unsupported `&str` constant: {:?}", ct);
-                            }
                         }
+
+                        self.push("_");
                     }
                     _ => {
-                        let pointee_ty =
+                        let pointee_ty = ct_ty
-                            ty.builtin_deref(true).expect("tried to dereference on non-ptr type");
+                            .builtin_deref(true)
-                        // FIXME(const_generics): add an assert that we only do this for valtrees.
+                            .expect("tried to dereference on non-ptr type");
-                        let dereferenced_const = self.tcx.mk_ct_from_kind(ct.kind());
+                        let dereferenced_const =
+                            ty::Const::new_value(self.tcx, valtree, pointee_ty);
                         dereferenced_const.print(self)?;
                     }
                 }
@@ -649,7 +640,7 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
                     Ok(())
                 };
 
-                match *ty.kind() {
+                match *ct_ty.kind() {
                     ty::Array(..) | ty::Slice(_) => {
                         self.push("A");
                         print_field_list(self)?;
@@ -698,7 +689,7 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
                 }
             }
             _ => {
-                bug!("symbol_names: unsupported constant of type `{}` ({:?})", ty, ct);
+                bug!("symbol_names: unsupported constant of type `{}` ({:?})", ct_ty, ct);
             }
         }
 

compiler/rustc_trait_selection/src/solve/eval_ctxt/mod.rs

@@ -1040,8 +1040,13 @@ impl<'tcx> EvalCtxt<'_, InferCtxt<'tcx>> {
     ) -> Option<ty::Const<'tcx>> {
         use rustc_middle::mir::interpret::ErrorHandled;
         match self.infcx.const_eval_resolve(param_env, unevaluated, DUMMY_SP) {
-            // THISPR
+            Ok(Some(val)) => Some(ty::Const::new_value(
-            Ok(Some(val)) => Some(ty::Const::new_value(self.interner(), val, todo!())),
+                self.interner(),
+                val,
+                self.interner()
+                    .type_of(unevaluated.def)
+                    .instantiate(self.interner(), unevaluated.args),
+            )),
             Ok(None) | Err(ErrorHandled::TooGeneric(_)) => None,
             Err(ErrorHandled::Reported(e, _)) => {
                 Some(ty::Const::new_error(self.interner(), e.into()))

compiler/rustc_trait_selection/src/solve/mod.rs

@@ -178,7 +178,9 @@ impl<'a, 'tcx> EvalCtxt<'a, InferCtxt<'tcx>> {
             ty::ConstKind::Infer(_) => {
                 self.evaluate_added_goals_and_make_canonical_response(Certainty::AMBIGUOUS)
             }
-            ty::ConstKind::Placeholder(_) | ty::ConstKind::Value(_) | ty::ConstKind::Error(_) => {
+            ty::ConstKind::Placeholder(_)
+            | ty::ConstKind::Value(_, _)
+            | ty::ConstKind::Error(_) => {
                 self.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
             }
             // We can freely ICE here as:

compiler/rustc_trait_selection/src/traits/auto_trait.rs

@@ -765,8 +765,7 @@ impl<'tcx> AutoTraitFinder<'tcx> {
                                 unevaluated,
                                 obligation.cause.span,
                             ) {
-                                // THISPR
+                                Ok(Some(valtree)) => Ok(ty::Const::new_value(selcx.tcx(),valtree, self.tcx.type_of(unevaluated.def).instantiate(self.tcx, unevaluated.args))),
-                                Ok(Some(valtree)) => Ok(ty::Const::new_value(selcx.tcx(),valtree, todo!())),
                                 Ok(None) => {
                                     let tcx = self.tcx;
                                     let reported =

compiler/rustc_trait_selection/src/traits/const_evaluatable.rs

@@ -34,7 +34,7 @@ pub fn is_const_evaluatable<'tcx>(
         ty::ConstKind::Param(_)
         | ty::ConstKind::Bound(_, _)
         | ty::ConstKind::Placeholder(_)
-        | ty::ConstKind::Value(_)
+        | ty::ConstKind::Value(_, _)
         | ty::ConstKind::Error(_) => return Ok(()),
         ty::ConstKind::Infer(_) => return Err(NotConstEvaluatable::MentionsInfer),
     };

compiler/rustc_transmute/src/lib.rs

@@ -135,7 +135,7 @@ mod rustc {
             use rustc_middle::ty::ScalarInt;
             use rustc_span::symbol::sym;
 
-            let Ok(cv) = c.eval(tcx, param_env, DUMMY_SP) else {
+            let Ok((ty, cv)) = c.eval(tcx, param_env, DUMMY_SP) else {
                 return Some(Self {
                     alignment: true,
                     lifetimes: true,
@@ -144,8 +144,7 @@ mod rustc {
                 });
             };
 
-            let assume_def_id = tcx.get_lang_items(()).get(LangItem::TransmuteOpts)?;
+            let adt_def = ty.ty_adt_def()?;
-            let adt_def = tcx.adt_def(assume_def_id);
 
             assert_eq!(
                 tcx.require_lang_item(LangItem::TransmuteOpts, None),

compiler/rustc_ty_utils/src/consts.rs

@@ -23,7 +23,7 @@ fn destructure_const<'tcx>(
     tcx: TyCtxt<'tcx>,
     const_: ty::Const<'tcx>,
 ) -> ty::DestructuredConst<'tcx> {
-    let ty::ConstKind::Value(valtree) = const_.kind() else {
+    let ty::ConstKind::Value(ct_ty, valtree) = const_.kind() else {
         bug!("cannot destructure constant {:?}", const_)
     };
 
@@ -32,9 +32,6 @@ fn destructure_const<'tcx>(
         _ => bug!("cannot destructure constant {:?}", const_),
     };
 
-    // THISPR
-    let ct_ty: Ty<'tcx> = todo!();
-
     let (fields, variant) = match ct_ty.kind() {
         ty::Array(inner_ty, _) | ty::Slice(inner_ty) => {
             // construct the consts for the elements of the array/slice

compiler/rustc_type_ir/src/const_kind.rs

@@ -32,7 +32,7 @@ pub enum ConstKind<I: Interner> {
     Unevaluated(ty::UnevaluatedConst<I>),
 
     /// Used to hold computed value.
-    Value(I::ValueConst),
+    Value(I::Ty, I::ValueConst),
 
     /// A placeholder for a const which could not be computed; this is
     /// propagated to avoid useless error messages.
@@ -51,7 +51,7 @@ impl<I: Interner> PartialEq for ConstKind<I> {
             (Bound(l0, l1), Bound(r0, r1)) => l0 == r0 && l1 == r1,
             (Placeholder(l0), Placeholder(r0)) => l0 == r0,
             (Unevaluated(l0), Unevaluated(r0)) => l0 == r0,
-            (Value(l0), Value(r0)) => l0 == r0,
+            (Value(l0, l1), Value(r0, r1)) => l0 == r0 && l1 == r1,
             (Error(l0), Error(r0)) => l0 == r0,
             (Expr(l0), Expr(r0)) => l0 == r0,
             _ => false,
@@ -80,7 +80,7 @@ impl<I: Interner> DebugWithInfcx<I> for ConstKind<I> {
             Unevaluated(uv) => {
                 write!(f, "{:?}", &this.wrap(uv))
             }
-            Value(valtree) => write!(f, "{valtree:?}"),
+            Value(ty, valtree) => write!(f, "({valtree:?}: {:?})", &this.wrap(ty)),
             Error(_) => write!(f, "{{const error}}"),
             Expr(expr) => write!(f, "{:?}", &this.wrap(expr)),
         }