{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"temporary_used_locals:"}]}
    temporary_used_locals: FxIndexSet<Local>,
struct GatherUsedMutsVisitor<'a, 'b, 'infcx, 'tcx> {
    never_initialized_mut_locals: &'a mut FxIndexSet<Local>,