fn validate_commodity_cost_map(
map: &CommodityCostMap,
regions: &HashSet<RegionID>,
milestone_years: &[u32],
time_slice_info: &TimeSliceInfo,
) -> Result<()>
fn validate_commodity_cost_map(
map: &CommodityCostMap,
regions: &HashSet<RegionID>,
milestone_years: &[u32],
time_slice_info: &TimeSliceInfo,
) -> Result<()>