syntax_data: {"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let source_info = self.source_info(span);
context_before:         let local_id = self.var_local_id(var, for_guard);
context_after:         self.cfg.push(block, Statement::new(source_info, StatementKind::StorageLive(local_id)));