{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"ast::Expr::WhileExpr(w)"}]}
        ast::Expr::WhileExpr(w) => walk_loop(cb, w.label(), w.loop_body()),
        ast::Expr::LoopExpr(l) => walk_loop(cb, l.label(), l.loop_body()),
        ast::Expr::ForExpr(f) => walk_loop(cb, f.label(), f.loop_body()),