Instantiate higher-ranked binder with erased when checking IntoIterator predicate query instability

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/ui/lint/internal/higher-ranked-query-instability.rs b/tests/ui/lint/internal/higher-ranked-query-instability.rs
new file mode 100644
index 00000000000..4407baac0c6
--- /dev/null
+++ b/tests/ui/lint/internal/higher-ranked-query-instability.rs
@@ -0,0 +1,11 @@
+//@ check-pass
+//@ compile-flags: -Zunstable-options
+
+// Make sure we don't try to resolve instances for trait refs that have escaping
+// bound vars when computing the query instability lint.
+
+fn foo<T>() where for<'a> &'a [T]: IntoIterator<Item = &'a T> {}
+
+fn main() {
+    foo::<()>();
+}