gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/__locale",
    "//libcxx/include/module.modulemap.in",
    "//libcxx/include/syncstream",
    "//libcxx/test/std/depr/depr.cpp.headers/ccomplex.verify.cpp",
    "//libcxx/test/std/depr/depr.cpp.headers/ciso646.verify.cpp",
    "//libcxx/test/std/depr/depr.cpp.headers/cstdalign.verify.cpp",
    "//libcxx/test/std/depr/depr.cpp.headers/cstdbool.verify.cpp",
    "//libcxx/test/std/depr/depr.cpp.headers/ctgmath.verify.cpp",
    "//libcxx/test/std/library/description/conventions/expos.only.func/synth_three_way.pass.cpp",
    "//libcxx/test/std/ranges/range.factories/range.iota.view/ctor.value.bound.pass.cpp",
    "//libcxx/test/std/ranges/range.factories/range.iota.view/end.pass.cpp",
    "//libcxx/test/std/ranges/range.factories/range.iota.view/iterator/star.pass.cpp",
    "//libcxx/test/std/utilities/tuple/tuple.tuple/tuple.rel/three_way.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": []
}