Function model_c 

pub fn model_c(
    regions: &[(u32, RegionCfg)],
    shape: LaneShape,
    device: &str,
) -> String

The model translation unit for regions (each with its host-side region number) on a device whose lanes are shape: every routine the regions use, every region, and the logos_dev_call driver with its accounting. device names the device in the accounting line.