More aliases

crates/hir-ty/src/interner.rs

@@ -1,9 +1,15 @@
 //! Implementation of the Chalk `Interner` trait, which allows customizing the
 //! representation of the various objects Chalk deals with (types, goals etc.).
 
-use crate::{chalk_db, tls, ConstScalar, GenericArg};
+use crate::{
+    chalk_db, tls, AliasTy, CanonicalVarKind, CanonicalVarKinds, ClosureId, Const, ConstData,
+    ConstScalar, Constraint, Constraints, FnDefId, GenericArg, GenericArgData, Goal, GoalData,
+    Goals, InEnvironment, Lifetime, LifetimeData, OpaqueTy, OpaqueTyId, ProgramClause,
+    ProgramClauseData, ProgramClauses, ProjectionTy, QuantifiedWhereClause, QuantifiedWhereClauses,
+    Substitution, Ty, TyData, TyKind, VariableKind, VariableKinds,
+};
 use base_db::salsa::InternId;
-use chalk_ir::{Goal, GoalData};
+use chalk_ir::{ProgramClauseImplication, SeparatorTraitRef, Variance};
 use hir_def::TypeAliasId;
 use intern::{impl_internable, Interned};
 use smallvec::SmallVec;
@@ -30,37 +36,70 @@ fn deref(&self) -> &Self::Target {
     }
 }
 
+#[derive(Eq)]
+pub struct PreHashedWrapper<T>(T, u64);
+
+impl<T: fmt::Debug> fmt::Debug for PreHashedWrapper<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.0, f)
+    }
+}
+
+impl<T: PartialEq> PartialEq for PreHashedWrapper<T> {
+    fn eq(&self, other: &Self) -> bool {
+        self.1 == other.1 && self.0 == other.0
+    }
+}
+
+impl<T> std::ops::Deref for PreHashedWrapper<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<T: std::hash::Hash> std::hash::Hash for PreHashedWrapper<T> {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        state.write_u64(self.1);
+    }
+}
+
 impl_internable!(
-    InternedWrapper<Vec<chalk_ir::VariableKind<Interner>>>,
+    InternedWrapper<Vec<VariableKind>>,
     InternedWrapper<SmallVec<[GenericArg; 2]>>,
-    InternedWrapper<chalk_ir::TyData<Interner>>,
-    InternedWrapper<chalk_ir::LifetimeData<Interner>>,
-    InternedWrapper<chalk_ir::ConstData<Interner>>,
+    InternedWrapper<TyData>,
+    InternedWrapper<LifetimeData>,
+    InternedWrapper<ConstData>,
     InternedWrapper<ConstScalar>,
-    InternedWrapper<Vec<chalk_ir::CanonicalVarKind<Interner>>>,
-    InternedWrapper<Vec<chalk_ir::ProgramClause<Interner>>>,
-    InternedWrapper<Vec<chalk_ir::QuantifiedWhereClause<Interner>>>,
-    InternedWrapper<Vec<chalk_ir::Variance>>,
+    InternedWrapper<Vec<CanonicalVarKind>>,
+    InternedWrapper<Vec<ProgramClause>>,
+    InternedWrapper<Vec<QuantifiedWhereClause>>,
+    InternedWrapper<SmallVec<[Variance; 16]>>,
+    // InternedWrapper<PreHashedWrapper<Goals>>,
 );
 
 impl chalk_ir::interner::Interner for Interner {
-    type InternedType = Interned<InternedWrapper<chalk_ir::TyData<Self>>>;
-    type InternedLifetime = Interned<InternedWrapper<chalk_ir::LifetimeData<Self>>>;
-    type InternedConst = Interned<InternedWrapper<chalk_ir::ConstData<Self>>>;
+    type InternedType = Interned<InternedWrapper<TyData>>;
+    type InternedLifetime = Interned<InternedWrapper<LifetimeData>>;
+    type InternedConst = Interned<InternedWrapper<ConstData>>;
     type InternedConcreteConst = ConstScalar;
-    type InternedGenericArg = chalk_ir::GenericArgData<Self>;
-    type InternedGoal = Arc<GoalData<Self>>;
-    type InternedGoals = Vec<Goal<Self>>;
+    type InternedGenericArg = GenericArgData;
+    // We could do the following, but that saves "only" 20mb on self while increasing inferecene
+    // time by ~2.5%
+    // type InternedGoal = Interned<InternedWrapper<GoalData>>;
+    // type InternedGoal = Interned<InternedWrapper<PreHashedWrapper<GoalData>>>;
+    type InternedGoal = Arc<GoalData>;
+    type InternedGoals = Vec<Goal>;
     type InternedSubstitution = Interned<InternedWrapper<SmallVec<[GenericArg; 2]>>>;
-    type InternedProgramClauses = Interned<InternedWrapper<Vec<chalk_ir::ProgramClause<Self>>>>;
-    type InternedProgramClause = chalk_ir::ProgramClauseData<Self>;
-    type InternedQuantifiedWhereClauses =
-        Interned<InternedWrapper<Vec<chalk_ir::QuantifiedWhereClause<Self>>>>;
-    type InternedVariableKinds = Interned<InternedWrapper<Vec<chalk_ir::VariableKind<Interner>>>>;
-    type InternedCanonicalVarKinds =
-        Interned<InternedWrapper<Vec<chalk_ir::CanonicalVarKind<Self>>>>;
-    type InternedConstraints = Vec<chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>>;
-    type InternedVariances = Interned<InternedWrapper<Vec<chalk_ir::Variance>>>;
+    type InternedProgramClauses = Interned<InternedWrapper<Vec<ProgramClause>>>;
+    type InternedProgramClause = ProgramClauseData;
+    type InternedQuantifiedWhereClauses = Interned<InternedWrapper<Vec<QuantifiedWhereClause>>>;
+    type InternedVariableKinds = Interned<InternedWrapper<Vec<VariableKind>>>;
+    type InternedCanonicalVarKinds = Interned<InternedWrapper<Vec<CanonicalVarKind>>>;
+    // type InternedConstraints = SmallVec<[InEnvironment<Constraint>; 1]>;
+    type InternedConstraints = Vec<InEnvironment<Constraint>>;
+    type InternedVariances = SmallVec<[Variance; 16]>;
     type DefId = InternId;
     type InternedAdtId = hir_def::AdtId;
     type Identifier = TypeAliasId;
@@ -88,68 +127,51 @@ fn debug_assoc_type_id(
     }
 
     fn debug_opaque_ty_id(
-        opaque_ty_id: chalk_ir::OpaqueTyId<Self>,
+        opaque_ty_id: OpaqueTyId,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "OpaqueTy#{}", opaque_ty_id.0))
     }
 
-    fn debug_fn_def_id(
-        fn_def_id: chalk_ir::FnDefId<Self>,
-        fmt: &mut fmt::Formatter<'_>,
-    ) -> Option<fmt::Result> {
+    fn debug_fn_def_id(fn_def_id: FnDefId, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         tls::with_current_program(|prog| Some(prog?.debug_fn_def_id(fn_def_id, fmt)))
     }
 
     fn debug_closure_id(
-        _fn_def_id: chalk_ir::ClosureId<Self>,
+        _fn_def_id: ClosureId,
         _fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         None
     }
 
-    fn debug_alias(
-        alias: &chalk_ir::AliasTy<Interner>,
-        fmt: &mut fmt::Formatter<'_>,
-    ) -> Option<fmt::Result> {
+    fn debug_alias(alias: &AliasTy, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         use std::fmt::Debug;
         match alias {
-            chalk_ir::AliasTy::Projection(projection_ty) => {
-                Interner::debug_projection_ty(projection_ty, fmt)
-            }
-            chalk_ir::AliasTy::Opaque(opaque_ty) => Some(opaque_ty.fmt(fmt)),
+            AliasTy::Projection(projection_ty) => Interner::debug_projection_ty(projection_ty, fmt),
+            AliasTy::Opaque(opaque_ty) => Some(opaque_ty.fmt(fmt)),
         }
     }
 
     fn debug_projection_ty(
-        proj: &chalk_ir::ProjectionTy<Interner>,
+        proj: &ProjectionTy,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         tls::with_current_program(|prog| Some(prog?.debug_projection_ty(proj, fmt)))
     }
 
-    fn debug_opaque_ty(
-        opaque_ty: &chalk_ir::OpaqueTy<Interner>,
-        fmt: &mut fmt::Formatter<'_>,
-    ) -> Option<fmt::Result> {
+    fn debug_opaque_ty(opaque_ty: &OpaqueTy, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", opaque_ty.opaque_ty_id))
     }
 
-    fn debug_ty(ty: &chalk_ir::Ty<Interner>, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
+    fn debug_ty(ty: &Ty, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", ty.data(Interner)))
     }
 
-    fn debug_lifetime(
-        lifetime: &chalk_ir::Lifetime<Interner>,
-        fmt: &mut fmt::Formatter<'_>,
-    ) -> Option<fmt::Result> {
+    fn debug_lifetime(lifetime: &Lifetime, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", lifetime.data(Interner)))
     }
 
-    fn debug_const(
-        constant: &chalk_ir::Const<Self>,
-        fmt: &mut fmt::Formatter<'_>,
-    ) -> Option<fmt::Result> {
+    fn debug_const(constant: &Const, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", constant.data(Interner)))
     }
 
@@ -161,102 +183,99 @@ fn debug_generic_arg(
     }
 
     fn debug_variable_kinds(
-        variable_kinds: &chalk_ir::VariableKinds<Self>,
+        variable_kinds: &VariableKinds,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", variable_kinds.as_slice(Interner)))
     }
 
     fn debug_variable_kinds_with_angles(
-        variable_kinds: &chalk_ir::VariableKinds<Self>,
+        variable_kinds: &VariableKinds,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", variable_kinds.inner_debug(Interner)))
     }
 
     fn debug_canonical_var_kinds(
-        canonical_var_kinds: &chalk_ir::CanonicalVarKinds<Self>,
+        canonical_var_kinds: &CanonicalVarKinds,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", canonical_var_kinds.as_slice(Interner)))
     }
-    fn debug_goal(goal: &Goal<Interner>, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
+    fn debug_goal(goal: &Goal, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         let goal_data = goal.data(Interner);
         Some(write!(fmt, "{goal_data:?}"))
     }
-    fn debug_goals(
-        goals: &chalk_ir::Goals<Interner>,
-        fmt: &mut fmt::Formatter<'_>,
-    ) -> Option<fmt::Result> {
+    fn debug_goals(goals: &Goals, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", goals.debug(Interner)))
     }
     fn debug_program_clause_implication(
-        pci: &chalk_ir::ProgramClauseImplication<Interner>,
+        pci: &ProgramClauseImplication<Self>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", pci.debug(Interner)))
     }
     fn debug_program_clause(
-        clause: &chalk_ir::ProgramClause<Self>,
+        clause: &ProgramClause,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", clause.data(Interner)))
     }
     fn debug_program_clauses(
-        clauses: &chalk_ir::ProgramClauses<Self>,
+        clauses: &ProgramClauses,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", clauses.as_slice(Interner)))
     }
     fn debug_substitution(
-        substitution: &chalk_ir::Substitution<Interner>,
+        substitution: &Substitution,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", substitution.debug(Interner)))
     }
     fn debug_separator_trait_ref(
-        separator_trait_ref: &chalk_ir::SeparatorTraitRef<'_, Interner>,
+        separator_trait_ref: &SeparatorTraitRef<'_, Interner>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", separator_trait_ref.debug(Interner)))
     }
 
     fn debug_quantified_where_clauses(
-        clauses: &chalk_ir::QuantifiedWhereClauses<Self>,
+        clauses: &QuantifiedWhereClauses,
         fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         Some(write!(fmt, "{:?}", clauses.as_slice(Interner)))
     }
 
     fn debug_constraints(
-        _clauses: &chalk_ir::Constraints<Self>,
+        _clauses: &Constraints,
         _fmt: &mut fmt::Formatter<'_>,
     ) -> Option<fmt::Result> {
         None
     }
 
-    fn intern_ty(self, kind: chalk_ir::TyKind<Self>) -> Self::InternedType {
+    fn intern_ty(self, kind: TyKind) -> Self::InternedType {
         let flags = kind.compute_flags(self);
-        Interned::new(InternedWrapper(chalk_ir::TyData { kind, flags }))
+        Interned::new(InternedWrapper(TyData { kind, flags }))
     }
 
-    fn ty_data(self, ty: &Self::InternedType) -> &chalk_ir::TyData<Self> {
+    fn ty_data(self, ty: &Self::InternedType) -> &TyData {
         &ty.0
     }
 
-    fn intern_lifetime(self, lifetime: chalk_ir::LifetimeData<Self>) -> Self::InternedLifetime {
+    fn intern_lifetime(self, lifetime: LifetimeData) -> Self::InternedLifetime {
         Interned::new(InternedWrapper(lifetime))
     }
 
-    fn lifetime_data(self, lifetime: &Self::InternedLifetime) -> &chalk_ir::LifetimeData<Self> {
+    fn lifetime_data(self, lifetime: &Self::InternedLifetime) -> &LifetimeData {
         &lifetime.0
     }
 
-    fn intern_const(self, constant: chalk_ir::ConstData<Self>) -> Self::InternedConst {
+    fn intern_const(self, constant: ConstData) -> Self::InternedConst {
         Interned::new(InternedWrapper(constant))
     }
 
-    fn const_data(self, constant: &Self::InternedConst) -> &chalk_ir::ConstData<Self> {
+    fn const_data(self, constant: &Self::InternedConst) -> &ConstData {
         &constant.0
     }
 
@@ -269,36 +288,33 @@ fn const_eq(
         !matches!(c1, ConstScalar::Bytes(..)) || !matches!(c2, ConstScalar::Bytes(..)) || (c1 == c2)
     }
 
-    fn intern_generic_arg(
-        self,
-        parameter: chalk_ir::GenericArgData<Self>,
-    ) -> Self::InternedGenericArg {
+    fn intern_generic_arg(self, parameter: GenericArgData) -> Self::InternedGenericArg {
         parameter
     }
 
-    fn generic_arg_data(
-        self,
-        parameter: &Self::InternedGenericArg,
-    ) -> &chalk_ir::GenericArgData<Self> {
+    fn generic_arg_data(self, parameter: &Self::InternedGenericArg) -> &GenericArgData {
         parameter
     }
 
-    fn intern_goal(self, goal: GoalData<Self>) -> Self::InternedGoal {
+    fn intern_goal(self, goal: GoalData) -> Self::InternedGoal {
         Arc::new(goal)
     }
 
-    fn goal_data(self, goal: &Self::InternedGoal) -> &GoalData<Self> {
+    fn goal_data(self, goal: &Self::InternedGoal) -> &GoalData {
         goal
     }
 
     fn intern_goals<E>(
         self,
-        data: impl IntoIterator<Item = Result<Goal<Self>, E>>,
+        data: impl IntoIterator<Item = Result<Goal, E>>,
     ) -> Result<Self::InternedGoals, E> {
+        // let hash =
+        //     std::hash::BuildHasher::hash_one(&BuildHasherDefault::<FxHasher>::default(), &goal);
+        // Interned::new(InternedWrapper(PreHashedWrapper(goal, hash)))
         data.into_iter().collect()
     }
 
-    fn goals_data(self, goals: &Self::InternedGoals) -> &[Goal<Interner>] {
+    fn goals_data(self, goals: &Self::InternedGoals) -> &[Goal] {
         goals
     }
 
@@ -313,37 +329,28 @@ fn substitution_data(self, substitution: &Self::InternedSubstitution) -> &[Gener
         &substitution.as_ref().0
     }
 
-    fn intern_program_clause(
-        self,
-        data: chalk_ir::ProgramClauseData<Self>,
-    ) -> Self::InternedProgramClause {
+    fn intern_program_clause(self, data: ProgramClauseData) -> Self::InternedProgramClause {
         data
     }
 
-    fn program_clause_data(
-        self,
-        clause: &Self::InternedProgramClause,
-    ) -> &chalk_ir::ProgramClauseData<Self> {
+    fn program_clause_data(self, clause: &Self::InternedProgramClause) -> &ProgramClauseData {
         clause
     }
 
     fn intern_program_clauses<E>(
         self,
-        data: impl IntoIterator<Item = Result<chalk_ir::ProgramClause<Self>, E>>,
+        data: impl IntoIterator<Item = Result<ProgramClause, E>>,
     ) -> Result<Self::InternedProgramClauses, E> {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn program_clauses_data(
-        self,
-        clauses: &Self::InternedProgramClauses,
-    ) -> &[chalk_ir::ProgramClause<Self>] {
+    fn program_clauses_data(self, clauses: &Self::InternedProgramClauses) -> &[ProgramClause] {
         clauses
     }
 
     fn intern_quantified_where_clauses<E>(
         self,
-        data: impl IntoIterator<Item = Result<chalk_ir::QuantifiedWhereClause<Self>, E>>,
+        data: impl IntoIterator<Item = Result<QuantifiedWhereClause, E>>,
     ) -> Result<Self::InternedQuantifiedWhereClauses, E> {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
@@ -351,27 +358,24 @@ fn intern_quantified_where_clauses<E>(
     fn quantified_where_clauses_data(
         self,
         clauses: &Self::InternedQuantifiedWhereClauses,
-    ) -> &[chalk_ir::QuantifiedWhereClause<Self>] {
+    ) -> &[QuantifiedWhereClause] {
         clauses
     }
 
     fn intern_generic_arg_kinds<E>(
         self,
-        data: impl IntoIterator<Item = Result<chalk_ir::VariableKind<Self>, E>>,
+        data: impl IntoIterator<Item = Result<VariableKind, E>>,
     ) -> Result<Self::InternedVariableKinds, E> {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn variable_kinds_data(
-        self,
-        parameter_kinds: &Self::InternedVariableKinds,
-    ) -> &[chalk_ir::VariableKind<Self>] {
+    fn variable_kinds_data(self, parameter_kinds: &Self::InternedVariableKinds) -> &[VariableKind] {
         &parameter_kinds.as_ref().0
     }
 
     fn intern_canonical_var_kinds<E>(
         self,
-        data: impl IntoIterator<Item = Result<chalk_ir::CanonicalVarKind<Self>, E>>,
+        data: impl IntoIterator<Item = Result<CanonicalVarKind, E>>,
     ) -> Result<Self::InternedCanonicalVarKinds, E> {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
@@ -379,30 +383,30 @@ fn intern_canonical_var_kinds<E>(
     fn canonical_var_kinds_data(
         self,
         canonical_var_kinds: &Self::InternedCanonicalVarKinds,
-    ) -> &[chalk_ir::CanonicalVarKind<Self>] {
+    ) -> &[CanonicalVarKind] {
         canonical_var_kinds
     }
     fn intern_constraints<E>(
         self,
-        data: impl IntoIterator<Item = Result<chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>, E>>,
+        data: impl IntoIterator<Item = Result<InEnvironment<Constraint>, E>>,
     ) -> Result<Self::InternedConstraints, E> {
         data.into_iter().collect()
     }
     fn constraints_data(
         self,
         constraints: &Self::InternedConstraints,
-    ) -> &[chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>] {
+    ) -> &[InEnvironment<Constraint>] {
         constraints
     }
 
     fn intern_variances<E>(
         self,
-        data: impl IntoIterator<Item = Result<chalk_ir::Variance, E>>,
+        data: impl IntoIterator<Item = Result<Variance, E>>,
     ) -> Result<Self::InternedVariances, E> {
-        Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
+        data.into_iter().collect::<Result<_, _>>()
     }
 
-    fn variances_data(self, variances: &Self::InternedVariances) -> &[chalk_ir::Variance] {
+    fn variances_data(self, variances: &Self::InternedVariances) -> &[Variance] {
         variances
     }
 }

crates/hir-ty/src/lib.rs

@@ -45,7 +45,7 @@ macro_rules! eprintln {
     fold::{Shift, TypeFoldable},
     interner::HasInterner,
     visit::{TypeSuperVisitable, TypeVisitable, TypeVisitor},
-    NoSolution, TyData,
+    NoSolution,
 };
 use either::Either;
 use hir_def::{hir::ExprId, type_ref::Rawness, GeneralConstId, TypeOrConstParamId};
@@ -152,10 +152,21 @@ macro_rules! eprintln {
 pub type Goal = chalk_ir::Goal<Interner>;
 pub type AliasEq = chalk_ir::AliasEq<Interner>;
 pub type Solution = chalk_solve::Solution<Interner>;
+pub type Constraint = chalk_ir::Constraint<Interner>;
+pub type Constraints = chalk_ir::Constraints<Interner>;
 pub type ConstrainedSubst = chalk_ir::ConstrainedSubst<Interner>;
 pub type Guidance = chalk_solve::Guidance<Interner>;
 pub type WhereClause = chalk_ir::WhereClause<Interner>;
 
+pub type CanonicalVarKind = chalk_ir::CanonicalVarKind<Interner>;
+pub type GoalData = chalk_ir::GoalData<Interner>;
+pub type Goals = chalk_ir::Goals<Interner>;
+pub type ProgramClauseData = chalk_ir::ProgramClauseData<Interner>;
+pub type ProgramClause = chalk_ir::ProgramClause<Interner>;
+pub type ProgramClauses = chalk_ir::ProgramClauses<Interner>;
+pub type TyData = chalk_ir::TyData<Interner>;
+pub type Variances = chalk_ir::Variances<Interner>;
+
 /// A constant can have reference to other things. Memory map job is holding
 /// the necessary bits of memory of the const eval session to keep the constant
 /// meaningful.