1 files changed, 10 insertions, 0 deletions
diff --git a/tests/ui/variance/variance-iterators-in-libcore.rs b/tests/ui/variance/variance-iterators-in-libcore.rs
new file mode 100644
index 000000000..a542e44d5
--- /dev/null
+++ b/tests/ui/variance/variance-iterators-in-libcore.rs
@@ -0,0 +1,10 @@
+// run-pass
+
+#![allow(dead_code)]
+
+use std::iter::{Fuse, Zip};
+
+fn fuse_covariant<'a, I>(iter: Fuse<&'static I>) -> Fuse<&'a I> { iter }
+fn zip_covariant<'a, A, B>(iter: Zip<&'static A, &'static B>) -> Zip<&'a A, &'a B> { iter }
+
+fn main() { }