syntax_data: {"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let local_decls = &body.local_decls;
context_before:         let basic_blocks = body.basic_blocks.as_mut();
context_after:         let needs_retag = |place: &Place<'tcx>| {