syntax_data: {"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut always_live_locals = DenseBitSet::new_filled(body.local_decls.len());
context_before: pub fn always_storage_live_locals(body: &Body<'_>) -> DenseBitSet<Local> {