Make type_implements_trait not a query

src/test/incremental/issue-86753.rs

@@ -0,0 +1,50 @@
+// edition:2018
+// revisions: rpass1
+
+
+// Regression test for #86753. The `type_implements_trait` query (since moved to a method)
+// was encountering an ICE during incremental testing when hashing its arguments.
+#![warn(rust_2021_compatibility)]
+
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Poll, Context};
+
+struct LocalSet {}
+struct RunUntil<'a, F> {
+    _local_set: &'a LocalSet,
+    _future: F,
+}
+impl<'a, F> RunUntil<'a, F> {
+    fn project<'pin>(self: Pin<&'pin mut Self>) -> Projection<'pin, 'a, F> {
+        unimplemented!()
+    }
+}
+
+struct Projection<'pin, 'a, F>
+where
+    RunUntil<'a, F>: 'pin,
+{
+    pub local_set: &'pin mut &'a LocalSet,
+    pub future: Pin<&'pin mut F>,
+}
+
+impl LocalSet {
+    fn with<T>(&self, _f: impl FnOnce() -> T) -> T {
+        unimplemented!()
+    }
+}
+impl<T: Future> Future for RunUntil<'_, T> {
+    type Output = T::Output;
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let me = self.project();
+        me.local_set.with(|| {
+            let _ = cx.waker();
+            let f = me.future;
+            let _ = f.poll(cx);
+            Poll::Pending
+        })
+    }
+}
+
+fn main() {}

src/test/ui/issues/issue-73886.stderr

@@ -8,7 +8,9 @@ error[E0605]: non-primitive cast: `u32` as `Option<_>`
   --> $DIR/issue-73886.rs:4:13
    |
 LL |     let _ = 7u32 as Option<_>;
-   |             ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
+   |             ^^^^^^^^^^^^^^^^^ help: consider using the `From` trait instead: `Option<_>::from(7u32)`
+   |
+   = note: an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object
 
 error: aborting due to 2 previous errors