Function __action173 

fn __action173<'a>(
    handler: &Handler,
    (_, l, _): (usize, SyntaxNode<'a>, usize),
    (_, v, _): (usize, Vec<SyntaxNode<'a>>, usize),
    (_, r, _): (usize, SyntaxNode<'a>, usize),
) -> SyntaxNode<'a>