{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"if"}]}
    if let FnRetTy::Return(output_ty) = *ret_ty {
pub fn walk_fn_ret_ty<'v, V: Visitor<'v>>(visitor: &mut V, ret_ty: &'v FnRetTy<'v>) -> V::Result {
        try_visit!(visitor.visit_ty_unambig(output_ty));