1 files changed, 10 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-3878.rs b/src/test/ui/issues/issue-3878.rs
new file mode 100644
index 000000000..a121f0ba8
--- /dev/null
+++ b/src/test/ui/issues/issue-3878.rs
@@ -0,0 +1,10 @@
+// run-pass
+// pretty-expanded FIXME #23616
+
+#![allow(path_statements)]
+#![feature(box_syntax)]
+
+pub fn main() {
+    let y: Box<_> = box 1;
+    y;
+}