syntax_data: {"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let idx = FieldIdx::from_usize(idx);
context_before:             // index we access them by.
context_after:             remap[locals[saved_local]] = Some((tys[saved_local].ty, variant_index, idx));