Add test with #[rustc_evaluate_where_clauses]

As suggested via reviewer feedback.

Author: wesleywiser

src/test/incremental/issue-85360-eval-obligation-ice.rs

@@ -1,5 +1,6 @@
 // revisions:cfail1 cfail2
-// compile-flags: --crate-type=lib --edition=2021
+//[cfail1] compile-flags: --crate-type=lib --edition=2021 -Zassert-incr-state=not-loaded
+//[cfail2] compile-flags: --crate-type=lib --edition=2021 -Zassert-incr-state=loaded
 // build-pass
 
 use core::any::Any;

src/test/ui/traits/issue-85360-eval-obligation-ice.rs

@@ -0,0 +1,130 @@
+// 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(TraitPredicate(<MaskedStorage<GenericComp<Pos>> as std::marker::Sized>, polarity:Positive), [])) = Ok(EvaluatedToOk)
+    //~| ERROR evaluate(Binder(TraitPredicate(<MaskedStorage<GenericComp<Pos>> as std::marker::Sized>, polarity:Positive), [])) = Ok(EvaluatedToOk)
+}
+
+#[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 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
+    }
+}

src/test/ui/traits/issue-85360-eval-obligation-ice.stderr

@@ -0,0 +1,20 @@
+error: evaluate(Binder(TraitPredicate(<MaskedStorage<GenericComp<Pos>> as std::marker::Sized>, polarity:Positive), [])) = Ok(EvaluatedToOk)
+  --> $DIR/issue-85360-eval-obligation-ice.rs:9:5
+   |
+LL |     test::<MaskedStorage<GenericComp<Pos>>>(make());
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL | fn test<T: Sized>(_: T) {}
+   |         - predicate
+
+error: evaluate(Binder(TraitPredicate(<MaskedStorage<GenericComp<Pos>> as std::marker::Sized>, polarity:Positive), [])) = Ok(EvaluatedToOk)
+  --> $DIR/issue-85360-eval-obligation-ice.rs:9:5
+   |
+LL |     test::<MaskedStorage<GenericComp<Pos>>>(make());
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+LL | fn test<T: Sized>(_: T) {}
+   |            ----- predicate
+
+error: aborting due to 2 previous errors
+