Function parse_rust_region 

pub fn parse_rust_region(
    bytes: &[u8],
    overflow: Option<&[u8]>,
    token: &str,
    layout: &RustProbeLayout,
) -> Result<Vec<RustProbeEntry>, RustProbeReadError>

One region, read back as the records its process wrote, in the order it wrote them: each slot holds its first sighting’s sequence and thread, and the overflow file beside it the decision combinations the region had no room for. Pages the bitmap says no probe touched are not read.