{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ExprKind::Gen(capt,"}]}
                ExprKind::Gen(capt, body, kind, decl_span) =>
                    visit_visitable!($($mut)? vis, block, opt_label),
                    visit_visitable!($($mut)? vis, capt, body, kind, decl_span),