Fix Box<Box> to add Send + Sync
@@ -121,7 +121,7 @@ impl Builder {
if let Some(ref trampoline) = self.async_trampoline {
chunks.push(Chunk::BoxFn {
- typ: trampoline.callback_type.clone(),
+ typ: format!("{} + Send + Sync", trampoline.callback_type),
});
let mut finish_args = vec![];
