syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Rvalue::Ref(_, BorrowKind::Mut { .. }, place) = rvalue {
context_before:     fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, loc: Location) {
context_after:             let local = place.local;