[experiment] Validate if c_unwind behaves as expected

Author: dianqk

src/lib.rs

@@ -13,6 +13,7 @@
 #![feature(naked_functions)]
 #![feature(repr_simd)]
 #![feature(rustc_attrs)]
+#![feature(c_unwind)]
 #![no_builtins]
 #![no_std]
 #![allow(unused_features)]