{"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
    let rest_pat = ctx.find_node_at_offset::<ast::RestPat>()?;
pub(crate) fn expand_rest_pattern(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let parent = rest_pat.syntax().parent()?;