{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
                // `e` is an `ExprKind::Lit` or an `ExprKind::Unary` containing
                // FIXME(nnethercote) The `expr` case should only match if
                // an `UnOp::Neg` and an `ExprKind::Lit`, like how