Function resolve_dev_package 

pub fn resolve_dev_package(
    source: &dyn DevReleaseSource,
    repo: &str,
    crate_in_manifest: &str,
    lane: (u64, u64),
) -> Result<ResolvedDevPackage>

Pick the release to pin for one package and name its archives.

repo is the base crate name (the repository), crate_in_manifest the -dev mirror whose archives the release carries.