syntax_data: {"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let ready_val = Rvalue::Aggregate(
context_before:     }));
context_after:         Box::new(AggregateKind::Adt(poll_def_id, VariantIdx::from_usize(0), args, None, None)),