1 files changed, 73 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/generic_const_exprs/issue-86710.rs b/src/test/ui/const-generics/generic_const_exprs/issue-86710.rs
new file mode 100644
index 000000000..bdd8a21b3
--- /dev/null
+++ b/src/test/ui/const-generics/generic_const_exprs/issue-86710.rs
@@ -0,0 +1,73 @@
+// build-pass
+
+#![allow(incomplete_features)]
+#![feature(generic_const_exprs)]
+
+use std::marker::PhantomData;
+
+fn main() {
+    let x = FooImpl::<BarImpl<1>> { phantom: PhantomData };
+    let _ = x.foo::<BarImpl<1>>();
+}
+
+trait Foo<T>
+where
+    T: Bar,
+{
+    fn foo<U>(&self)
+    where
+        T: Operation<U>,
+        <T as Operation<U>>::Output: Bar;
+}
+
+struct FooImpl<T>
+where
+    T: Bar,
+{
+    phantom: PhantomData<T>,
+}
+
+impl<T> Foo<T> for FooImpl<T>
+where
+    T: Bar,
+{
+    fn foo<U>(&self)
+    where
+        T: Operation<U>,
+        <T as Operation<U>>::Output: Bar,
+    {
+        <<T as Operation<U>>::Output as Bar>::error_occurs_here();
+    }
+}
+
+trait Bar {
+    fn error_occurs_here();
+}
+
+struct BarImpl<const N: usize>;
+
+impl<const N: usize> Bar for BarImpl<N> {
+    fn error_occurs_here() {}
+}
+
+trait Operation<Rhs> {
+    type Output;
+}
+
+//// Part-A: This causes error.
+impl<const M: usize, const N: usize> Operation<BarImpl<M>> for BarImpl<N>
+where
+    BarImpl<{ N + M }>: Sized,
+{
+    type Output = BarImpl<{ N + M }>;
+}
+
+//// Part-B: This doesn't cause error.
+// impl<const M: usize, const N: usize> Operation<BarImpl<M>> for BarImpl<N> {
+//     type Output = BarImpl<M>;
+// }
+
+//// Part-C: This also doesn't cause error.
+// impl<const M: usize, const N: usize> Operation<BarImpl<M>> for BarImpl<N> {
+//     type Output = BarImpl<{ M }>;
+// }