src/test/run-make-fulldeps/foreign-double-unwind/foo.rs

   1 // Tests that C++ double unwinding through Rust code will be properly guarded
   2 // against instead of exhibiting undefined behaviour.
   3
   4 #![feature(c_unwind)]
   5
   6 extern "C-unwind" {
   7     fn throw_cxx_exception();
   8     fn cxx_catch_callback(cb: extern "C-unwind" fn());
   9 }
  10
  11 struct ThrowOnDrop;
  12
  13 impl Drop for ThrowOnDrop {
  14     fn drop(&mut self) {
  15         unsafe { throw_cxx_exception() };
  16     }
  17 }
  18
  19 extern "C-unwind" fn test_double_unwind() {
  20     let _a = ThrowOnDrop;
  21     let _b = ThrowOnDrop;
  22 }
  23
  24 fn main() {
  25     unsafe { cxx_catch_callback(test_double_unwind) };
  26 }