syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"data.prefix_index"}]}
source_snippet:         data.prefix_index += 1;
context_before:         data.prefix[data.prefix_index] = Some(Reg::i32());
context_after:         data.last_offset = data.last_offset + Reg::i32().size;