gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/__filesystem/copy_options.h",
    "//libcxx/include/__mdspan/mdspan.h",
    "//libcxx/test/libcxx/containers/views/mdspan/mdspan/assert.size.pass.cpp",
    "//libcxx/test/libcxx/containers/views/mdspan/nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/algorithm.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/array.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/cstdlib.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/deque.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/forward_list.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/functional.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/limits.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/list.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/mutex.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/new.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/queue.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/stack.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/string.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/string_view.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/utility.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/diagnostics/vector.nodiscard.verify.cpp",
    "//libcxx/test/libcxx/thread/nodiscard.verify.cpp",
    "//libcxx/test/libcxx/utilities/smartptr/nodiscard.verify.cpp",
    "//libcxx/test/std/input.output/filesystems/fs.enum/enum.copy_options.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": []
}
running all tests due to change to blacklisted file