renderParamList

fn renderParamList(
    r: *Render,
    lparen: Ast.TokenIndex,
    params: []const Ast.Node.Index,
    space: Space,
) Error!void {
    const tree = r.tree;
    const ais = r.ais;

    if (params.len == 0) {
        try ais.pushIndent(.normal);
        try renderToken(r, lparen, .none); // (
        ais.popIndent();
        return renderToken(r, lparen + 1, space); // )
    }

    const last_param = params[params.len - 1];
    const after_last_param_tok = tree.lastToken(last_param) + 1;
    if (tree.tokenTag(after_last_param_tok) == .comma) {
        try ais.pushIndent(.normal);
        try renderToken(r, lparen, .newline); // (
        for (params, 0..) |param_node, i| {
            if (i + 1 < params.len) {
                try renderExpression(r, param_node, .none);

                const comma = tree.lastToken(param_node) + 1;
                try renderToken(r, comma, .newline); // ,

                try renderExtraNewline(r, params[i + 1]);
            } else {
                try ais.pushSpace(.comma);
                try renderExpression(r, param_node, .comma);
                ais.popSpace();
            }
        }
        ais.popIndent();
        return renderToken(r, after_last_param_tok + 1, space); // )
    }

    try ais.pushIndent(.normal);
    try renderToken(r, lparen, .none); // (
    for (params, 0..) |param_node, i| {
        try renderExpression(r, param_node, .none);

        if (i + 1 < params.len) {
            const comma = tree.lastToken(param_node) + 1;
            try renderToken(r, comma, .maybe_space);
        }
    }
    ais.popIndent();
    return renderToken(r, after_last_param_tok, space); // )
}