--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/exceptions-test-0.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,167 @@
+//  { dg-do run }
+
+// Test exceptions.
+
+#include "../coro.h"
+#include <exception>
+
+int gX = 0;
+
+struct coro1 {
+  struct promise_type;
+  using handle_type = coro::coroutine_handle<coro1::promise_type>;
+  handle_type handle;
+  coro1 () : handle(0) {}
+  coro1 (handle_type _handle)
+    : handle(_handle) {
+        PRINT("Created coro1 object from handle");
+  }
+  coro1 (const coro1 &) = delete; // no copying
+  coro1 (coro1 &&s) : handle(s.handle) {
+    s.handle = nullptr;
+    PRINT("coro1 mv ctor ");
+  }
+  coro1 &operator = (coro1 &&s) {
+    handle = s.handle;
+    s.handle = nullptr;
+    PRINT("coro1 op=  ");
+    return *this;
+  }
+  ~coro1() {
+    PRINT("Destroyed coro1");
+    if ( handle )
+      handle.destroy();
+  }
+
+  struct suspend_never_prt {
+    bool await_ready() const noexcept { return true; }
+    void await_suspend(handle_type) const noexcept { PRINT ("susp-never-susp"); }
+    void await_resume() const noexcept { PRINT ("susp-never-resume");}
+  };
+
+  /* NOTE: this has a DTOR to test that pathway.  */
+  struct  suspend_always_prt {
+    bool await_ready() const noexcept { return false; }
+    void await_suspend(handle_type) const noexcept { PRINT ("susp-always-susp"); }
+    void await_resume() const noexcept { PRINT ("susp-always-resume"); }
+    ~suspend_always_prt() { PRINT ("susp-always-DTOR"); }
+  };
+
+  struct promise_type {
+  int value;
+  promise_type() {  PRINT ("Created Promise"); }
+  ~promise_type() { PRINT ("Destroyed Promise"); }
+
+  auto get_return_object () {
+    PRINT ("get_return_object: handle from promise");
+    return handle_type::from_promise (*this);
+  }
+  auto initial_suspend () {
+    PRINT ("get initial_suspend (always)");
+    return suspend_always_prt{};
+  }
+  auto final_suspend () {
+    PRINT ("get final_suspend (always)");
+    return suspend_always_prt{};
+  }
+  void return_value (int v) {
+    PRINTF ("return_value () %d\n",v);
+    value = v;
+  }
+  auto yield_value (int v) {
+    PRINTF ("yield_value () %d and suspend always\n",v);
+    value = v;
+    return suspend_always_prt{};
+  }
+  /* Some non-matching overloads.  */
+  auto yield_value (suspend_always_prt s, int x) {
+    return s;
+  }
+  auto yield_value (void) {
+    return 42;//suspend_always_prt{};
+  }
+  int get_value (void) { return value; }
+
+  void unhandled_exception() {
+    PRINT ("unhandled_exception: caught one!");
+    gX = -1;
+    // returning from here should end up in final_suspend.
+    }
+  };
+};
+
+// So we want to check that the internal behaviour of try/catch is 
+// working OK - and that if we have an unhandled exception it is caught
+// by the wrapper that we add to the rewritten func.
+
+struct coro1 throw_and_catch () noexcept
+{
+  int caught = 0;
+
+  try {
+    PRINT ("f: about to yield 42");
+    co_yield 42;
+ 
+    throw (20);
+
+    PRINT ("f: about to yield 6174");
+    co_return 6174;
+
+  } catch (int x) {
+    PRINTF ("f: caught %d\n", x);
+    caught = x;
+  }
+
+  PRINTF ("f: about to yield what we caught %d\n", caught);
+  co_yield caught;
+
+  throw ("bah");
+
+  PRINT ("f: about to return 22");
+  co_return 22;
+}
+
+int main ()
+{
+  PRINT ("main: create coro1");
+  struct coro1 x = throw_and_catch ();
+  if (x.handle.done())
+    abort();
+  x.handle.resume();
+  PRINT ("main: got coro, resuming..");
+  int y = x.handle.promise().get_value();
+  if ( y != 42 )
+    abort ();
+  PRINT ("main: apparently got the expected 42");
+  if (x.handle.done())
+    abort();
+  PRINT ("main: resuming...");
+  x.handle.resume();
+
+  y = x.handle.promise().get_value();
+  if ( y != 20 )
+    abort ();
+  PRINT ("main: apparently got 20, which we expected");
+  if (x.handle.done())
+    abort();
+
+  PRINT ("main: resuming...");
+  x.handle.resume();
+  // This should cause the throw of "bah" which is unhandled.
+  // We should catch the unhandled exception and then fall through
+  // to the final suspend point... thus be "done".
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently not done...");
+      abort ();
+    }
+  // When we caught the unhandled exception we flagged it instead of
+  // std::terminate-ing.
+  if (gX != -1)
+    {
+      PRINT ("main: apparently failed to catch");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}