{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"let"}]}
    let match_expr = ctx.find_node_at_offset_with_descend::<ast::MatchExpr>()?;
pub(crate) fn add_missing_match_arms(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let match_arm_list = match_expr.match_arm_list()?;