syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"data.prefix[data.prefix_index]"}]}
source_snippet:         data.prefix[data.prefix_index] = Some(Reg::f64());
context_before:     } else {
context_after:         data.last_offset = offset + Reg::f64().size;