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|
// compile-flags: --edition=2021
#![feature(rustc_attrs)]
use core::any::Any;
use core::marker::PhantomData;
fn main() {
test::<MaskedStorage<GenericComp<Pos>>>(make());
//~^ ERROR evaluate(Binder { value: TraitPredicate(<MaskedStorage<GenericComp<Pos>> as std::marker::Sized>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOk)
//~| ERROR evaluate(Binder { value: TraitPredicate(<MaskedStorage<GenericComp<Pos>> as std::marker::Sized>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOk)
test::<MaskedStorage<GenericComp2<Pos>>>(make());
//~^ ERROR evaluate(Binder { value: TraitPredicate(<MaskedStorage<GenericComp2<Pos>> as std::marker::Sized>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOkModuloRegions)
//~| ERROR evaluate(Binder { value: TraitPredicate(<MaskedStorage<GenericComp2<Pos>> as std::marker::Sized>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOkModuloRegions)
}
#[rustc_evaluate_where_clauses]
fn test<T: Sized>(_: T) {}
fn make<T>() -> T {
todo!()
}
struct DerefWrap<T>(T);
impl<T> core::ops::Deref for DerefWrap<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
struct Storage<T, D> {
phantom: PhantomData<(T, D)>,
}
type ReadStorage<T> = Storage<T, DerefWrap<MaskedStorage<T>>>;
pub trait Component {
type Storage;
}
struct VecStorage;
struct Pos;
impl Component for Pos {
type Storage = VecStorage;
}
struct GenericComp<T> {
_t: T,
}
impl<T: 'static> Component for GenericComp<T> {
type Storage = VecStorage;
}
struct GenericComp2<T> {
_t: T,
}
impl<T: 'static> Component for GenericComp2<T> where for<'a> &'a bool: 'a {
type Storage = VecStorage;
}
struct ReadData {
pos_interpdata: ReadStorage<GenericComp<Pos>>,
}
trait System {
type SystemData;
fn run(data: Self::SystemData, any: Box<dyn Any>);
}
struct Sys;
impl System for Sys {
type SystemData = (ReadData, ReadStorage<Pos>);
fn run((data, pos): Self::SystemData, any: Box<dyn Any>) {
<ReadStorage<GenericComp<Pos>> as SystemData>::setup(any);
ParJoin::par_join((&pos, &data.pos_interpdata));
}
}
trait ParJoin {
fn par_join(self)
where
Self: Sized,
{
}
}
impl<'a, T, D> ParJoin for &'a Storage<T, D>
where
T: Component,
D: core::ops::Deref<Target = MaskedStorage<T>>,
T::Storage: Sync,
{
}
impl<A, B> ParJoin for (A, B)
where
A: ParJoin,
B: ParJoin,
{
}
pub trait SystemData {
fn setup(any: Box<dyn Any>);
}
impl<T: 'static> SystemData for ReadStorage<T>
where
T: Component,
{
fn setup(any: Box<dyn Any>) {
let storage: &MaskedStorage<T> = any.downcast_ref().unwrap();
<dyn Any as CastFrom<MaskedStorage<T>>>::cast(&storage);
}
}
pub struct MaskedStorage<T: Component> {
_inner: T::Storage,
}
pub unsafe trait CastFrom<T> {
fn cast(t: &T) -> &Self;
}
unsafe impl<T> CastFrom<T> for dyn Any
where
T: Any + 'static,
{
fn cast(t: &T) -> &Self {
t
}
}
|
