gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/U.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/const_optional_U.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/copy.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/ctor.verify.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/deduct.verify.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/default.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/empty_in_place_t_does_not_clobber.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_const_optional_U.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/explicit_optional_U.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/in_place_t.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/initializer_list.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/move.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/nullopt_t.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/optional_U.pass.cpp",
    "//libcxx/test/std/utilities/optional/optional.object/optional.object.ctor/rvalue_T.pass.cpp"
  ],
  "test_targets": [
    "//clang-tools-extra/clangd/test:check-clangd",
    "//clang-tools-extra/test:check-clang-tools",
    "//clang/test:check-clang",
    "//compiler-rt/test/hwasan:check-hwasan",
    "//lld/test:check-lld",
    "//llvm/test:check-llvm"
  ],
  "additional_compile_targets": []
}