syntax_data: {"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let (sized_tail, sized_fields) = sized_offsets.raw.split_last().unwrap();
context_after:                 let (unsized_tail, unsized_fields) = unsized_offsets.raw.split_last().unwrap();