* Returns a stream of roots.
     */
    Stream<FileSystemLocationSnapshot> roots();

    /**
     * Walks the whole hierarchy represented by this snapshot.
     *
     * The walk is depth first.
     */
    SnapshotVisitResult accept(FileSystemSnapshotHierarchyVisitor visitor);

    /**
     * Walks the whole hierarchy represented by this snapshot.
     *
     * The walk is depth first.
     */

	// to avoid confusion about what gets returned
	// in the presence of type assertions.
}

func walkStmtList(s []ir.Node) {
	for i := range s {
		s[i] = walkStmt(s[i])
	}
}

// walkFor walks an OFOR node.
func walkFor(n *ir.ForStmt) ir.Node {
	if n.Cond != nil {
		init := ir.TakeInit(n.Cond)
		walkStmtList(init)
		n.Cond = walkExpr(n.Cond, &init)
		n.Cond = ir.InitExpr(init, n.Cond)
	}

}

// walkRuneToString walks an ORUNESTR node.
func walkRuneToString(n *ir.ConvExpr, init *ir.Nodes) ir.Node {
	a := typecheck.NodNil()
	if n.Esc() == ir.EscNone {
		a = stackBufAddr(4, types.Types[types.TUINT8])
	}
	// intstring(*[4]byte, rune)
	return mkcall("intstring", n.Type(), init, a, typecheck.Conv(n.X, types.Types[types.TINT64]))
}

// walkStringToBytes walks an OSTR2BYTES node.

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package schema

// Visitor recursively walks through a structural schema.
type Visitor struct {
	// Structural is called on each Structural node in the schema, before recursing into
	// the subtrees. It is allowed to mutate s. Return true if something has been changed.

    def setup() {
        copyActionProcessingStream = new CopySpecBackedCopyActionProcessingStream(copySpecInternal, instantiator, objectFactory, fileSystem, false)
    }

    def "walks spec"() {
        when:
        copyActionProcessingStream.process(action)

        then:
        1 * copySpecInternal.walk(_ as CopySpecActionImpl)
    }

// Package tests defines an Analyzer that checks for common mistaken
// usages of tests and examples.
//
// # Analyzer tests
//
// tests: check for common mistaken usages of tests and examples
//
// The tests checker walks Test, Benchmark, Fuzzing and Example functions checking
// malformed names, wrong signatures and examples documenting non-existent
// identifiers.
//
// Please see the documentation for package testing in golang.org/pkg/testing

	}
	return n
}

// walkDot walks an ODOT or ODOTPTR node.
func walkDot(n *ir.SelectorExpr, init *ir.Nodes) ir.Node {
	usefield(n)
	n.X = walkExpr(n.X, init)
	return n
}

// walkDotType walks an ODOTTYPE or ODOTTYPE2 node.
func walkDotType(n *ir.TypeAssertExpr, init *ir.Nodes) ir.Node {
	n.X = walkExpr(n.X, init)

	if !ok {
		return Dir{}, false
	}
	d.hist = append(d.hist, dir)
	d.offset++
	return dir, ok
}

// walk walks the trees in GOROOT and GOPATH.
func (d *Dirs) walk(roots []Dir) {
	for _, root := range roots {
		d.bfsWalkRoot(root)
	}
	close(d.scan)
}

// bfsWalkRoot walks a single directory hierarchy in breadth-first lexical order.
// Each Go source directory it finds is delivered on d.scan.

	if as.X != nil && as.Y != nil {
		return convas(as, init)
	}
	return as
}

// walkAssignDotType walks an OAS2DOTTYPE node.
func walkAssignDotType(n *ir.AssignListStmt, init *ir.Nodes) ir.Node {
	walkExprListSafe(n.Lhs, init)
	n.Rhs[0] = walkExpr(n.Rhs[0], init)
	return n
}

// walkAssignFunc walks an OAS2FUNC node.
func walkAssignFunc(init *ir.Nodes, n *ir.AssignListStmt) ir.Node {
	init.Append(ir.TakeInit(n)...)

import org.hamcrest.CoreMatchers.equalTo
import org.hamcrest.MatcherAssert.assertThat

import org.junit.Test


class WalkReproduciblyTest : FolderBasedTest() {

    @Test
    fun `walks directory tree top-down yielding sorted files`() {
        withFolders {
            "root" {
                withFile("root-f2")
                "b" {
                    withFile("b-f1")
                }