pkg/front_end/testcases/nnbd/strong_package_not_ok_from_dill/.dart_tool/package_config.json

{
  "configVersion": 2,
  "packages": [
    {
      "name": "opt_out_package",
      "rootUri": "../opt_out_package/lib/",
      "languageVersion": "2.7"
    },
    {
      "name": "opt_in_package",
      "rootUri": "../opt_in_package/lib/"
    }

  ]
}