{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
    let fn_node = ctx.find_node_at_offset::<ast::Fn>()?;
pub(crate) fn generate_default_from_new(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let fn_name = fn_node.name()?;