Trap returns through a define_method {}

This code is a bit suspect. It should probably check the return is for
it...

vm/builtin/block_as_method.cpp

@@ -46,6 +46,19 @@ namespace rubinius {
 
     invocation.module = msg.module;
 
-    return (*bm->block_env()->execute)(state, call_frame, bm->block_env(), args, invocation);
+    Object* ret = (*bm->block_env()->execute)(state, call_frame,
+                                       bm->block_env(), args, invocation);
+
+    if(!ret) {
+      RaiseReason reason = state->thread_state()->raise_reason();
+      if(reason == cReturn || reason == cBreak) {
+        // TODO investigate if we should check the destination_scope here.
+        // It doesn't appear that MRI checks anything similar.
+        ret = state->thread_state()->raise_value();
+        state->thread_state()->clear_exception(true);
+      }
+    }
+
+    return ret;
   }
 }