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extract ConstKind::Unevaluated into a struct

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This commit is contained in:
lcnr 2021-03-12 00:01:34 +01:00
parent 41b315a470
commit 43ebac119b
25 changed files with 131 additions and 88 deletions
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2
compiler/rustc_codegen_ssa/src/mir/constant.rs
View file

@ -30,7 +30,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::ConstantKind::Val(val, _) => return Ok(val),
};
match ct.val {
ty::ConstKind::Unevaluated(def, substs, promoted) => self
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => self
.cx
.tcx()
.const_eval_resolve(ty::ParamEnv::reveal_all(), def, substs, promoted, None)

12
compiler/rustc_middle/src/ty/consts.rs
View file

@ -98,18 +98,18 @@ impl<'tcx> Const<'tcx> {
let name = tcx.hir().name(hir_id);
ty::ConstKind::Param(ty::ParamConst::new(index, name))
}
_ => ty::ConstKind::Unevaluated(
def.to_global(),
InternalSubsts::identity_for_item(tcx, def.did.to_def_id()),
None,
),
_ => ty::ConstKind::Unevaluated(ty::Unevaluated {
def: def.to_global(),
substs: InternalSubsts::identity_for_item(tcx, def.did.to_def_id()),
promoted: None,
}),
};
tcx.mk_const(ty::Const { val, ty })
}
#[inline]
/// Interns the given value as a constant.
#[inline]
pub fn from_value(tcx: TyCtxt<'tcx>, val: ConstValue<'tcx>, ty: Ty<'tcx>) -> &'tcx Self {
tcx.mk_const(Self { val: ConstKind::Value(val), ty })
}

16
compiler/rustc_middle/src/ty/consts/kind.rs
View file

@ -12,10 +12,18 @@ use rustc_macros::HashStable;
use rustc_target::abi::Size;
use super::ScalarInt;
/// An unevaluated, potentially generic, constant.
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable)]
#[derive(Hash, HashStable)]
pub struct Unevaluated<'tcx> {
pub def: ty::WithOptConstParam<DefId>,
pub substs: SubstsRef<'tcx>,
pub promoted: Option<Promoted>,
}
/// Represents a constant in Rust.
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable, Hash)]
#[derive(HashStable)]
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, TyEncodable, TyDecodable)]
#[derive(Hash, HashStable)]
pub enum ConstKind<'tcx> {
/// A const generic parameter.
Param(ty::ParamConst),
@ -31,7 +39,7 @@ pub enum ConstKind<'tcx> {
/// Used in the HIR by using `Unevaluated` everywhere and later normalizing to one of the other
/// variants when the code is monomorphic enough for that.
Unevaluated(ty::WithOptConstParam<DefId>, SubstsRef<'tcx>, Option<Promoted>),
Unevaluated(Unevaluated<'tcx>),
/// Used to hold computed value.
Value(ConstValue<'tcx>),
@ -102,7 +110,7 @@ impl<'tcx> ConstKind<'tcx> {
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
) -> Option<Result<ConstValue<'tcx>, ErrorReported>> {
if let ConstKind::Unevaluated(def, substs, promoted) = self {
if let ConstKind::Unevaluated(Unevaluated { def, substs, promoted }) = self {
use crate::mir::interpret::ErrorHandled;
// HACK(eddyb) this erases lifetimes even though `const_eval_resolve`

10
compiler/rustc_middle/src/ty/flags.rs
View file

@ -270,10 +270,7 @@ impl FlagComputation {
fn add_const(&mut self, c: &ty::Const<'_>) {
self.add_ty(c.ty);
match c.val {
ty::ConstKind::Unevaluated(_, substs, _) => {
self.add_substs(substs);
self.add_flags(TypeFlags::HAS_CT_PROJECTION);
}
ty::ConstKind::Unevaluated(unevaluated) => self.add_unevaluated_const(unevaluated),
ty::ConstKind::Infer(infer) => {
self.add_flags(TypeFlags::STILL_FURTHER_SPECIALIZABLE);
match infer {
@ -297,6 +294,11 @@ impl FlagComputation {
}
}
fn add_unevaluated_const(&mut self, ct: ty::Unevaluated<'tcx>) {
self.add_substs(ct.substs);
self.add_flags(TypeFlags::HAS_CT_PROJECTION);
}
fn add_existential_projection(&mut self, projection: &ty::ExistentialProjection<'_>) {
self.add_substs(projection.substs);
self.add_ty(projection.ty);

2
compiler/rustc_middle/src/ty/mod.rs
View file

@ -55,7 +55,7 @@ pub use rustc_type_ir::*;
pub use self::binding::BindingMode;
pub use self::binding::BindingMode::*;
pub use self::consts::{Const, ConstInt, ConstKind, InferConst, ScalarInt, ValTree};
pub use self::consts::{Const, ConstInt, ConstKind, InferConst, ScalarInt, Unevaluated, ValTree};
pub use self::context::{
tls, CanonicalUserType, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations,
CtxtInterners, DelaySpanBugEmitted, FreeRegionInfo, GeneratorInteriorTypeCause, GlobalCtxt,

2
compiler/rustc_middle/src/ty/print/pretty.rs
View file

@ -915,7 +915,7 @@ pub trait PrettyPrinter<'tcx>:
}
match ct.val {
ty::ConstKind::Unevaluated(def, substs, promoted) => {
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
if let Some(promoted) = promoted {
p!(print_value_path(def.did, substs));
p!(write("::{:?}", promoted));

24
compiler/rustc_middle/src/ty/relate.rs
View file

@ -531,24 +531,26 @@ pub fn super_relate_consts<R: TypeRelation<'tcx>>(
check_const_value_eq(relation, a_val, b_val, a, b)?
}
(
ty::ConstKind::Unevaluated(a_def, a_substs, None),
ty::ConstKind::Unevaluated(b_def, b_substs, None),
) if tcx.features().const_evaluatable_checked && !relation.visit_ct_substs() => {
tcx.try_unify_abstract_consts(((a_def, a_substs), (b_def, b_substs)))
(ty::ConstKind::Unevaluated(au), ty::ConstKind::Unevaluated(bu))
if tcx.features().const_evaluatable_checked && !relation.visit_ct_substs() =>
{
tcx.try_unify_abstract_consts(((au.def, au.substs), (bu.def, bu.substs)))
}
// While this is slightly incorrect, it shouldn't matter for `min_const_generics`
// and is the better alternative to waiting until `const_evaluatable_checked` can
// be stabilized.
(
ty::ConstKind::Unevaluated(a_def, a_substs, a_promoted),
ty::ConstKind::Unevaluated(b_def, b_substs, b_promoted),
) if a_def == b_def && a_promoted == b_promoted => {
(ty::ConstKind::Unevaluated(au), ty::ConstKind::Unevaluated(bu))
if au.def == bu.def && au.promoted == bu.promoted =>
{
let substs =
relation.relate_with_variance(ty::Variance::Invariant, a_substs, b_substs)?;
relation.relate_with_variance(ty::Variance::Invariant, au.substs, bu.substs)?;
return Ok(tcx.mk_const(ty::Const {
val: ty::ConstKind::Unevaluated(a_def, substs, a_promoted),
val: ty::ConstKind::Unevaluated(ty::Unevaluated {
def: au.def,
substs,
promoted: au.promoted,
}),
ty: a.ty,
}));
}

10
compiler/rustc_middle/src/ty/structural_impls.rs
View file

@ -1031,8 +1031,12 @@ impl<'tcx> TypeFoldable<'tcx> for ty::ConstKind<'tcx> {
match self {
ty::ConstKind::Infer(ic) => ty::ConstKind::Infer(ic.fold_with(folder)),
ty::ConstKind::Param(p) => ty::ConstKind::Param(p.fold_with(folder)),
ty::ConstKind::Unevaluated(did, substs, promoted) => {
ty::ConstKind::Unevaluated(did, substs.fold_with(folder), promoted)
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
ty::ConstKind::Unevaluated(ty::Unevaluated {
def,
substs: substs.fold_with(folder),
promoted,
})
}
ty::ConstKind::Value(_)
| ty::ConstKind::Bound(..)
@ -1045,7 +1049,7 @@ impl<'tcx> TypeFoldable<'tcx> for ty::ConstKind<'tcx> {
match *self {
ty::ConstKind::Infer(ic) => ic.visit_with(visitor),
ty::ConstKind::Param(p) => p.visit_with(visitor),
ty::ConstKind::Unevaluated(_, substs, _) => substs.visit_with(visitor),
ty::ConstKind::Unevaluated(ct) => ct.substs.visit_with(visitor),
ty::ConstKind::Value(_)
| ty::ConstKind::Bound(..)
| ty::ConstKind::Placeholder(_)

4
compiler/rustc_middle/src/ty/walk.rs
View file

@ -195,8 +195,8 @@ fn push_inner<'tcx>(stack: &mut TypeWalkerStack<'tcx>, parent: GenericArg<'tcx>)
| ty::ConstKind::Value(_)
| ty::ConstKind::Error(_) => {}
ty::ConstKind::Unevaluated(_, substs, _) => {
stack.extend(substs.iter().rev());
ty::ConstKind::Unevaluated(ct) => {
stack.extend(ct.substs.iter().rev());
}
}
}

6
compiler/rustc_mir/src/borrow_check/type_check/mod.rs
View file

@ -316,14 +316,12 @@ impl<'a, 'b, 'tcx> Visitor<'tcx> for TypeVerifier<'a, 'b, 'tcx> {
let tcx = self.tcx();
let maybe_uneval = match constant.literal {
ConstantKind::Ty(ct) => match ct.val {
ty::ConstKind::Unevaluated(def, substs, promoted) => {
Some((def, substs, promoted))
}
ty::ConstKind::Unevaluated(uv) => Some(uv),
_ => None,
},
_ => None,
};
if let Some((def, substs, promoted)) = maybe_uneval {
if let Some(ty::Unevaluated { def, substs, promoted }) = maybe_uneval {
if let Some(promoted) = promoted {
let check_err = |verifier: &mut TypeVerifier<'a, 'b, 'tcx>,
promoted: &Body<'tcx>,

2
compiler/rustc_mir/src/interpret/operand.rs
View file

@ -560,7 +560,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
match val.val {
ty::ConstKind::Param(_) | ty::ConstKind::Bound(..) => throw_inval!(TooGeneric),
ty::ConstKind::Error(_) => throw_inval!(AlreadyReported(ErrorReported)),
ty::ConstKind::Unevaluated(def, substs, promoted) => {
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
let instance = self.resolve(def, substs)?;
Ok(self.eval_to_allocation(GlobalId { instance, promoted })?.into())
}

2
compiler/rustc_mir/src/monomorphize/collector.rs
View file

@ -646,7 +646,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirNeighborCollector<'a, 'tcx> {
match substituted_constant.val {
ty::ConstKind::Value(val) => collect_const_value(self.tcx, val, self.output),
ty::ConstKind::Unevaluated(def, substs, promoted) => {
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
match self.tcx.const_eval_resolve(param_env, def, substs, promoted, None) {
Ok(val) => collect_const_value(self.tcx, val, self.output),
Err(ErrorHandled::Reported(ErrorReported) | ErrorHandled::Linted) => {}

6
compiler/rustc_mir/src/monomorphize/polymorphize.rs
View file

@ -299,7 +299,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
self.unused_parameters.clear(param.index);
ControlFlow::CONTINUE
}
ty::ConstKind::Unevaluated(def, _, Some(p))
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs: _, promoted: Some(p)})
// Avoid considering `T` unused when constants are of the form:
// `<Self as Foo<T>>::foo::promoted[p]`
if self.def_id == def.did && !self.tcx.generics_of(def.did).has_self =>
@ -310,10 +310,10 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
self.visit_body(&promoted[p]);
ControlFlow::CONTINUE
}
ty::ConstKind::Unevaluated(def, unevaluated_substs, None)
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted: None })
if self.tcx.def_kind(def.did) == DefKind::AnonConst =>
{
self.visit_child_body(def.did, unevaluated_substs);
self.visit_child_body(def.did, substs);
ControlFlow::CONTINUE
}
_ => c.super_visit_with(self),

2
compiler/rustc_mir/src/transform/check_consts/qualifs.rs
View file

@ -247,7 +247,7 @@ where
// Check the qualifs of the value of `const` items.
if let Some(ct) = constant.literal.const_for_ty() {
if let ty::ConstKind::Unevaluated(def, _, promoted) = ct.val {
if let ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs: _, promoted }) = ct.val {
assert!(promoted.is_none());
// Don't peek inside trait associated constants.
if cx.tcx.trait_of_item(def.did).is_none() {

6
compiler/rustc_mir/src/transform/const_prop.rs
View file

@ -491,7 +491,11 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
let lint_only = match c.literal {
ConstantKind::Ty(ct) => match ct.val {
// Promoteds must lint and not error as the user didn't ask for them
ConstKind::Unevaluated(_, _, Some(_)) => true,
ConstKind::Unevaluated(ty::Unevaluated {
def: _,
substs: _,
promoted: Some(_),
}) => true,
// Out of backwards compatibility we cannot report hard errors in unused
// generic functions using associated constants of the generic parameters.
_ => c.literal.needs_subst(),

2
compiler/rustc_mir/src/transform/inline.rs
View file

@ -630,7 +630,7 @@ impl Inliner<'tcx> {
caller_body.required_consts.extend(
callee_body.required_consts.iter().copied().filter(|&ct| {
match ct.literal.const_for_ty() {
Some(ct) => matches!(ct.val, ConstKind::Unevaluated(_, _, _)),
Some(ct) => matches!(ct.val, ConstKind::Unevaluated(_)),
None => true,
}
}),

8
compiler/rustc_mir/src/transform/promote_consts.rs
View file

@ -1001,17 +1001,17 @@ impl<'a, 'tcx> Promoter<'a, 'tcx> {
literal: tcx
.mk_const(ty::Const {
ty,
val: ty::ConstKind::Unevaluated(
val: ty::ConstKind::Unevaluated(ty::Unevaluated {
def,
InternalSubsts::for_item(tcx, def.did, |param, _| {
substs: InternalSubsts::for_item(tcx, def.did, |param, _| {
if let ty::GenericParamDefKind::Lifetime = param.kind {
tcx.lifetimes.re_erased.into()
} else {
tcx.mk_param_from_def(param)
}
}),
Some(promoted_id),
),
promoted: Some(promoted_id),
}),
})
.into(),
}))

2
compiler/rustc_mir/src/transform/required_consts.rs
View file

@ -15,7 +15,7 @@ impl<'a, 'tcx> RequiredConstsVisitor<'a, 'tcx> {
impl<'a, 'tcx> Visitor<'tcx> for RequiredConstsVisitor<'a, 'tcx> {
fn visit_constant(&mut self, constant: &Constant<'tcx>, _: Location) {
if let Some(ct) = constant.literal.const_for_ty() {
if let ConstKind::Unevaluated(_, _, _) = ct.val {
if let ConstKind::Unevaluated(_) = ct.val {
self.required_consts.push(*constant);
}
}

16
compiler/rustc_mir_build/src/thir/cx/expr.rs
View file

@ -707,11 +707,11 @@ impl<'thir, 'tcx> Cx<'thir, 'tcx> {
// and not the beginning of discriminants (which is always `0`)
let substs = InternalSubsts::identity_for_item(self.tcx(), did);
let lhs = mk_const(self.tcx().mk_const(ty::Const {
val: ty::ConstKind::Unevaluated(
ty::WithOptConstParam::unknown(did),
val: ty::ConstKind::Unevaluated(ty::Unevaluated {
def: ty::WithOptConstParam::unknown(did),
substs,
None,
),
promoted: None,
}),
ty: var_ty,
}));
let bin =
@ -905,11 +905,11 @@ impl<'thir, 'tcx> Cx<'thir, 'tcx> {
debug!("convert_path_expr: (const) user_ty={:?}", user_ty);
ExprKind::Literal {
literal: self.tcx.mk_const(ty::Const {
val: ty::ConstKind::Unevaluated(
ty::WithOptConstParam::unknown(def_id),
val: ty::ConstKind::Unevaluated(ty::Unevaluated {
def: ty::WithOptConstParam::unknown(def_id),
substs,
None,
),
promoted: None,
}),
ty: self.typeck_results().node_type(expr.hir_id),
}),
user_ty,

7
compiler/rustc_trait_selection/src/traits/auto_trait.rs
View file

@ -803,7 +803,12 @@ impl AutoTraitFinder<'tcx> {
}
ty::PredicateKind::ConstEquate(c1, c2) => {
let evaluate = |c: &'tcx ty::Const<'tcx>| {
if let ty::ConstKind::Unevaluated(def, substs, promoted) = c.val {
if let ty::ConstKind::Unevaluated(ty::Unevaluated {
def,
substs,
promoted,
}) = c.val
{
match select.infcx().const_eval_resolve(
obligation.param_env,
def,

49
compiler/rustc_trait_selection/src/traits/const_evaluatable.rs
View file

@ -239,7 +239,9 @@ impl AbstractConst<'tcx> {
ct: &ty::Const<'tcx>,
) -> Result<Option<AbstractConst<'tcx>>, ErrorReported> {
match ct.val {
ty::ConstKind::Unevaluated(def, substs, None) => AbstractConst::new(tcx, def, substs),
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted: _ }) => {
AbstractConst::new(tcx, def, substs)
}
ty::ConstKind::Error(_) => Err(ErrorReported),
_ => Ok(None),
}
@ -532,22 +534,25 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
if let Some(next) = self.build_terminator(block.terminator())? {
block = &self.body.basic_blocks()[next];
} else {
assert_eq!(self.locals[mir::RETURN_PLACE], self.nodes.last().unwrap());
// `AbstractConst`s should not contain any promoteds as they require references which
// are not allowed.
assert!(!self.nodes.iter().any(|n| matches!(
n.node,
Node::Leaf(ty::Const { val: ty::ConstKind::Unevaluated(_, _, Some(_)), ty: _ })
)));
self.nodes[self.locals[mir::RETURN_PLACE]].used = true;
if let Some(&unused) = self.nodes.iter().find(|n| !n.used) {
self.error(Some(unused.span), "dead code")?;
}
return Ok(self.tcx.arena.alloc_from_iter(self.nodes.into_iter().map(|n| n.node)));
break;
}
}
assert_eq!(self.locals[mir::RETURN_PLACE], self.nodes.last().unwrap());
for n in self.nodes.iter() {
if let Node::Leaf(ty::Const { val: ty::ConstKind::Unevaluated(ct), ty: _ }) = n.node {
// `AbstractConst`s should not contain any promoteds as they require references which
// are not allowed.
assert_eq!(ct.promoted, None);
}
}
self.nodes[self.locals[mir::RETURN_PLACE]].used = true;
if let Some(&unused) = self.nodes.iter().find(|n| !n.used) {
self.error(Some(unused.span), "dead code")?;
}
Ok(self.tcx.arena.alloc_from_iter(self.nodes.into_iter().map(|n| n.node)))
}
}
@ -673,10 +678,16 @@ pub(super) fn try_unify<'tcx>(
// we do not want to use `assert_eq!(a(), b())` to infer that `N` and `M` have to be `1`. This
// means that we only allow inference variables if they are equal.
(ty::ConstKind::Infer(a_val), ty::ConstKind::Infer(b_val)) => a_val == b_val,
(
ty::ConstKind::Unevaluated(a_def, a_substs, None),
ty::ConstKind::Unevaluated(b_def, b_substs, None),
) => a_def == b_def && a_substs == b_substs,
// We expand generic anonymous constants at the start of this function, so this
// branch should only be taking when dealing with associated constants, at
// which point directly comparing them seems like the desired behavior.
//
// FIXME(const_evaluatable_checked): This isn't actually the case.
// We also take this branch for concrete anonymous constants and
// expand generic anonymous constants with concrete substs.
(ty::ConstKind::Unevaluated(a_uv), ty::ConstKind::Unevaluated(b_uv)) => {
a_uv == b_uv
}
// FIXME(const_evaluatable_checked): We may want to either actually try
// to evaluate `a_ct` and `b_ct` if they are are fully concrete or something like
// this, for now we just return false here.

15
compiler/rustc_trait_selection/src/traits/fulfill.rs
View file

@ -516,15 +516,13 @@ impl<'a, 'b, 'tcx> FulfillProcessor<'a, 'b, 'tcx> {
// if the constants depend on generic parameters.
//
// Let's just see where this breaks :shrug:
if let (
ty::ConstKind::Unevaluated(a_def, a_substs, None),
ty::ConstKind::Unevaluated(b_def, b_substs, None),
) = (c1.val, c2.val)
if let (ty::ConstKind::Unevaluated(a), ty::ConstKind::Unevaluated(b)) =
(c1.val, c2.val)
{
if self
.selcx
.tcx()
.try_unify_abstract_consts(((a_def, a_substs), (b_def, b_substs)))
.try_unify_abstract_consts(((a.def, a.substs), (b.def, b.substs)))
{
return ProcessResult::Changed(vec![]);
}
@ -534,7 +532,12 @@ impl<'a, 'b, 'tcx> FulfillProcessor<'a, 'b, 'tcx> {
let stalled_on = &mut pending_obligation.stalled_on;
let mut evaluate = |c: &'tcx Const<'tcx>| {
if let ty::ConstKind::Unevaluated(def, substs, promoted) = c.val {
if let ty::ConstKind::Unevaluated(ty::Unevaluated {
def,
substs,
promoted,
}) = c.val
{
match self.selcx.infcx().const_eval_resolve(
obligation.param_env,
def,

7
compiler/rustc_trait_selection/src/traits/select/mod.rs
View file

@ -556,7 +556,12 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
debug!(?c1, ?c2, "evaluate_predicate_recursively: equating consts");
let evaluate = |c: &'tcx ty::Const<'tcx>| {
if let ty::ConstKind::Unevaluated(def, substs, promoted) = c.val {
if let ty::ConstKind::Unevaluated(ty::Unevaluated {
def,
substs,
promoted,
}) = c.val
{
self.infcx
.const_eval_resolve(
obligation.param_env,

2
compiler/rustc_trait_selection/src/traits/wf.rs
View file

@ -430,7 +430,7 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
GenericArgKind::Const(constant) => {
match constant.val {
ty::ConstKind::Unevaluated(def, substs, promoted) => {
ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }) => {
assert!(promoted.is_none());
let obligations = self.nominal_obligations(def.did, substs);

5
compiler/rustc_typeck/src/collect.rs
View file

@ -2212,10 +2212,11 @@ fn const_evaluatable_predicates_of<'tcx>(
fn visit_anon_const(&mut self, c: &'tcx hir::AnonConst) {
let def_id = self.tcx.hir().local_def_id(c.hir_id);
let ct = ty::Const::from_anon_const(self.tcx, def_id);
if let ty::ConstKind::Unevaluated(def, substs, None) = ct.val {
if let ty::ConstKind::Unevaluated(uv) = ct.val {
assert_eq!(uv.promoted, None);
let span = self.tcx.hir().span(c.hir_id);
self.preds.insert((
ty::PredicateKind::ConstEvaluatable(def, substs).to_predicate(self.tcx),
ty::PredicateKind::ConstEvaluatable(uv.def, uv.substs).to_predicate(self.tcx),
span,
));
}