t.Fatal(err)
		}
		return out
	}

	// Build a shared library that defines a symbol whose name
	// contains magicInput.

	cShared := cCompile("-shared", "c.so", cDefFile)

	// Build an object file that refers to the symbol whose name
	// contains magicInput.

	cObj := cCompile("-c", "c.o", cRefFile)

	// Rewrite the shared library and the object file, replacing

John Howard <******@****.***> 1711679342 -0700

// See the License for the specific language governing permissions and
// limitations under the License.

// dot -Tpng src/docs/userguide/img/swift-shared-library-task-graph.dot > src/docs/userguide/img/swift-shared-library-task-graph.png
digraph swiftSharedLibraryTaskGraph {
  graph [ dpi = 100, fontname="Sans"];
  node [fontname = "Sans"];
  edge [fontname = "Sans"];

// See the License for the specific language governing permissions and
// limitations under the License.

// dot -Tpng src/docs/userguide/img/cpp-shared-library-task-graph.dot > src/docs/userguide/img/cpp-shared-library-task-graph.png
digraph cppSharedLibraryTaskGraph {
  graph [ dpi = 100, fontname="Sans"];
  node [fontname = "Sans"];
  edge [fontname = "Sans"];

swift-shared-library-task-graph.png...

cpp-shared-library-task-graph.png...

John Howard <******@****.***> 1593618905 -0700

Anis Elleuch <******@****.***> 1676280398 +0100

			false,
		},
		{
			// 'directory' is a directory on mount
			// /var/lib/docker/devicemapper/test/shared that is shared, but one
			// of its parent is private.
			"nested-shared",
			"/var/lib/docker/devicemapper/test/shared/my/test/directory",
			true,
		},
		{
			// /var/lib/foo is a mount point and it's shared
			"shared-mount",
			"/var/lib/foo",
			true,
		},
		{
			// /var/lib/bar is a mount point and it's private

			// so the key was re-added and may have been shared after the call.
			// Try again with more time to park.
			d *= 2
			continue
		}

		// All of the Do calls ended up sharing the first
		// invocation, so the key should have been unused
		// (and therefore unshared) when they returned.
		if shared.Load() > 0 {
			t.Errorf("after a single shared Do, ForgetUnshared returned false %d times", shared.Load())
		}