syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"Box::new(AggregateKind::Adt(poll_def_id,"}]}
source_snippet:         Box::new(AggregateKind::Adt(poll_def_id, VariantIdx::from_usize(0), args, None, None)),
context_before:     let ready_val = Rvalue::Aggregate(
context_after:         IndexVec::from_raw(vec![val]),