1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/issue-118950-root-region.rs b/tests/ui/traits/next-solver/issue-118950-root-region.rs
new file mode 100644
index 000000000..10fb7d525
--- /dev/null
+++ b/tests/ui/traits/next-solver/issue-118950-root-region.rs
@@ -0,0 +1,22 @@
+// compile-flags: -Znext-solver
+//
+// This is a gnarly test but I don't know how to minimize it, frankly.
+
+#![feature(lazy_type_alias)]
+//~^ WARN the feature `lazy_type_alias` is incomplete
+
+trait ToUnit<'a> {
+    type Unit;
+}
+
+trait Overlap<T> {}
+
+type Assoc<'a, T> = <*const T as ToUnit<'a>>::Unit;
+
+impl<T> Overlap<T> for T {}
+
+impl<T> Overlap<for<'a> fn(Assoc<'a, T>)> for T where Missing: Overlap<T> {}
+//~^ ERROR conflicting implementations of trait `Overlap<fn(_)>` for type `fn(_)`
+//~| ERROR cannot find type `Missing` in this scope
+
+fn main() {}