syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"rev_lookup.locals[local]"}]}
source_snippet:                 rev_lookup.locals[local] = rev_lookup.locals[base_local];
context_before:                 let base_local = rev_lookup.un_derefer.deref_chain(local).first().unwrap().local;
context_after:             }