{"ast_node_type":"variable","tokens":[{"end":15,"kind":"keyword","start":0,"text":"let"}]}
    let param =
fn comma_wrapper(ctx: &CompletionContext<'_>) -> Option<(impl Fn(&str) -> String, TextRange)> {
        ctx.original_token.parent_ancestors().find(|node| node.kind() == SyntaxKind::PARAM)?;