Function generate_std_roots

pub fn generate_std_roots(
    crates: &[String],
    units: &[Unit],
    std_resolve: &Resolve,
    std_features: &ResolvedFeatures,
    kinds: &[CompileKind],
    package_set: &PackageSet<'_>,
    interner: &UnitInterner,
    profiles: &Profiles,
    target_data: &RustcTargetData<'_>,
) -> CargoResult<HashMap<CompileKind, Vec<Unit>>>

Generates a map of root units for the standard library for each kind requested.

• crates is the arg value from -Zbuild-std.
• units is the root units of the build.