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//@ compile-flags: --crate-type lib
//@ check-pass
//
// Regression test for issue #84399
// Tests that we keep the full `ParamEnv` when
// caching predicates with freshened types in the global cache
use std::marker::PhantomData;
pub trait Allocator<R> {
type Buffer;
}
pub struct DefaultAllocator;
impl <R> Allocator<R> for DefaultAllocator {
type Buffer = ();
}
pub type Owned<R> = <DefaultAllocator as Allocator<R>>::Buffer;
pub type MatrixMN<R> = Matrix<R, Owned<R>>;
pub type Matrix4<N> = Matrix<N, ()>;
pub struct Matrix<R, S> {
pub data: S,
_phantoms: PhantomData<R>,
}
pub fn set_object_transform(matrix: &Matrix4<()>) {
matrix.js_buffer_view();
}
pub trait Storable {
type Cell;
fn slice_to_items(_buffer: &()) -> &[Self::Cell] {
unimplemented!()
}
}
pub type Cell<T> = <T as Storable>::Cell;
impl<R> Storable for MatrixMN<R>
where
DefaultAllocator: Allocator<R>,
{
type Cell = ();
}
pub trait JsBufferView {
fn js_buffer_view(&self) -> usize {
unimplemented!()
}
}
impl<R> JsBufferView for [MatrixMN<R>]
where
DefaultAllocator: Allocator<R>,
MatrixMN<R>: Storable,
[Cell<MatrixMN<R>>]: JsBufferView,
{
fn js_buffer_view(&self) -> usize {
<MatrixMN<R> as Storable>::slice_to_items(&()).js_buffer_view()
}
}
impl JsBufferView for [()] {}
impl<R> JsBufferView for MatrixMN<R> where DefaultAllocator: Allocator<R> {}
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