1 files changed, 15 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-17322.rs b/src/test/ui/issues/issue-17322.rs
new file mode 100644
index 000000000..20a8d1361
--- /dev/null
+++ b/src/test/ui/issues/issue-17322.rs
@@ -0,0 +1,15 @@
+// run-pass
+// pretty-expanded FIXME #23616
+
+#![feature(box_syntax)]
+
+use std::io::{self, Write};
+
+fn f(wr: &mut dyn Write) {
+    wr.write_all(b"hello").ok().expect("failed");
+}
+
+fn main() {
+    let mut wr = box io::stdout() as Box<dyn Write>;
+    f(&mut wr);
+}