1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/unsized-locals/unsized-locals-using-unsized-fn-params.rs b/src/test/ui/unsized-locals/unsized-locals-using-unsized-fn-params.rs
new file mode 100644
index 000000000..15263954c
--- /dev/null
+++ b/src/test/ui/unsized-locals/unsized-locals-using-unsized-fn-params.rs
@@ -0,0 +1,15 @@
+#![feature(box_patterns)]
+#![feature(unsized_fn_params)]
+
+#[allow(dead_code)]
+fn f1(box box _b: Box<Box<[u8]>>) {}
+//~^ ERROR: the size for values of type `[u8]` cannot be known at compilation time [E0277]
+
+fn f2((_x, _y): (i32, [i32])) {}
+//~^ ERROR: the size for values of type `[i32]` cannot be known at compilation time [E0277]
+
+fn main() {
+    let foo: Box<[u8]> = Box::new(*b"foo");
+    let _foo: [u8] = *foo;
+    //~^ ERROR: the size for values of type `[u8]` cannot be known at compilation time [E0277]
+}