{"ast_node_type":"function","tokens":[{"end":65,"kind":"keyword","start":0,"text":"fn"}]}
    fn new(tcx: TyCtxt<'tcx>, body: &'a mut Body<'tcx>) -> Self {
impl<'a, 'tcx> CfgSimplifier<'a, 'tcx> {
        let mut pred_count = IndexVec::from_elem(0u32, &body.basic_blocks);