{"ast_node_type":"function","tokens":[{"end":98,"kind":"keyword","start":0,"text":"pub"}]}
pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FnRetTy<'v>) -> V::Result {
    if let FnRetTy::Return(output_ty) = *ret_ty {