julia.withPackages: remove handling for julia_16

}:

let

  # The specific package resolution code depends on the Julia version

  # These are pretty similar and could be combined to reduce duplication

  resolveCode = if lib.versionOlder julia.version "1.7" then resolveCode1_6 else resolveCode1_8;

  resolveCode1_6 = ''

    import Pkg.API: check_package_name

    import Pkg.Types: Context!, PRESERVE_NONE, manifest_info, project_deps_resolve!, registry_resolve!, stdlib_resolve!, ensure_resolved

    import Pkg.Operations: _resolve, assert_can_add, is_dep, update_package_add

    foreach(pkg -> check_package_name(pkg.name, :add), pkgs)

    pkgs = deepcopy(pkgs)  # deepcopy for avoid mutating PackageSpec members

    Context!(ctx)

    project_deps_resolve!(ctx, pkgs)

    registry_resolve!(ctx, pkgs)

    stdlib_resolve!(pkgs)

    ensure_resolved(ctx, pkgs, registry=true)

    assert_can_add(ctx, pkgs)

    for (i, pkg) in pairs(pkgs)

        entry = manifest_info(ctx, pkg.uuid)

        pkgs[i] = update_package_add(ctx, pkg, entry, is_dep(ctx, pkg))

    end

    foreach(pkg -> ctx.env.project.deps[pkg.name] = pkg.uuid, pkgs)

    pkgs, deps_map = _resolve(ctx, pkgs, PRESERVE_NONE)

'';

  resolveCode1_8 = ''

  resolveCode = ''

    import Pkg.API: handle_package_input!

    import Pkg.Types: PRESERVE_NONE, UUID, VersionSpec, project_deps_resolve!, registry_resolve!, stdlib_resolve!, ensure_resolved

    import Pkg.Operations: _resolve, assert_can_add, update_package_add