Function try_value_subset 

fn try_value_subset(
    values: &mut Vec<DynSolValue>,
    simple_values: &[DynSolValue],
    shrinkable_idxs: &[usize],
    subset_size: usize,
    start: usize,
    subset: &mut Vec<usize>,
    try_values: &mut dyn FnMut(&[DynSolValue]) -> bool,
) -> bool