1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/specialization/min_specialization/spec-iter.rs b/tests/ui/specialization/min_specialization/spec-iter.rs
new file mode 100644
index 000000000..e17e9dd5f
--- /dev/null
+++ b/tests/ui/specialization/min_specialization/spec-iter.rs
@@ -0,0 +1,20 @@
+// Check that we can specialize on a concrete iterator type. This requires us
+// to consider which parameters in the parent impl are constrained.
+
+// check-pass
+
+#![feature(min_specialization)]
+
+trait SpecFromIter<T> {
+    fn f(&self);
+}
+
+impl<'a, T: 'a, I: Iterator<Item = &'a T>> SpecFromIter<T> for I {
+    default fn f(&self) {}
+}
+
+impl<'a, T> SpecFromIter<T> for std::slice::Iter<'a, T> {
+    fn f(&self) {}
+}
+
+fn main() {}