{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
                let niche_size = |tmp_l: &TmpLayout<FieldIdx, VariantIdx>| {
                use cmp::Ordering::*;
                    tmp_l.layout.largest_niche.map_or(0, |n| n.available(dl))