syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let elem = ProjectionElem::ConstantIndex {
context_before:             let end_offset = (idx + 1) as u64;
context_after:                 offset: if exact_size { min_length - end_offset } else { end_offset },