Function __action150 

fn __action150<'a>(
    handler: &Handler,
    (_, l, _): (usize, SyntaxNode<'a>, usize),
    (_, x, _): (usize, Vec<SyntaxNode<'a>>, usize),
    (_, r, _): (usize, SyntaxNode<'a>, usize),
) -> SyntaxNode<'a>