syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // #bb_call: rv = call fut.poll() (or future_drop_poll(fut) for internal future drops)
context_before:         // #bb_pin: fut_pin = Pin<FutT>::new_unchecked(&mut fut)
context_after:         // #bb_check: match (rv)