syntax_data: {"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let univariant = |tys: &[Ty<'tcx>], kind| {
context_after:         let fields = tys.iter().map(|ty| cx.layout_of(*ty)).try_collect::<IndexVec<_, _>>()?;