{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
    let attr: ast::Attr = ctx.find_node_at_offset()?;
pub(crate) fn toggle_ignore(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let func = attr.syntax().parent().and_then(ast::Fn::cast)?;