[AUTO-GENERATED] Migrate ui tests from // to //@ directives

tests/ui/array-slice-vec/box-of-array-of-drop-1.rs

@@ -1,11 +1,11 @@
-// run-pass
-// needs-unwind
+//@ run-pass
+//@ needs-unwind
 #![allow(overflowing_literals)]
 
 // Test that we cleanup a fixed size Box<[D; k]> properly when D has a
 // destructor.
 
-// ignore-emscripten no threads support
+//@ ignore-emscripten no threads support
 
 use std::thread;
 use std::sync::atomic::{AtomicUsize, Ordering};