return (int) in.skip(n);
  }

  @CanIgnoreReturnValue // to skip a byte
  @Override
  public int readUnsignedByte() throws IOException {
    int b1 = in.read();
    if (0 > b1) {
      throw new EOFException();
    }

    return b1;
  }

  /**
   * Reads an unsigned {@code short} as specified by {@link DataInputStream#readUnsignedShort()},
   * except using little-endian byte order.
   *

		m := make(map[io.Reader]io.Writer)
		mv := ValueOf(m)
		b1 := new(bytes.Buffer)
		b2 := new(bytes.Buffer)
		mv.SetMapIndex(ValueOf(b1), ValueOf(b2))
		x, ok := m[b1]
		if x != b2 {
			t.Errorf("#5 after SetMapIndex(b1, b2): %p (!= %p), %t (map=%v)", x, b2, ok, m)
		}
		if p := mv.MapIndex(ValueOf(b1)).Elem().UnsafePointer(); p != unsafe.Pointer(b2) {
			t.Errorf("#5 MapIndex(b1) = %#x want %p", p, b2)
		}
	}
	{

	b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoSyscall)
	b0.Event("GoSyscallEndBlocked")

	// A bare M stole the goroutine's P at the generation boundary.
	b1 := g.Batch(trace.ThreadID(1), 0)
	b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))

			return x
		}
	}
	return nil
}

var sink *uint64

func main() {
	var a1, a2 A
	var b1, b2, b3, b4 B
	var x1, x2, x3, x4 uint64 // ERROR "moved to heap: x1" "moved to heap: x3"
	b1.b[0] = &x1
	b2.b[0] = &x2
	b3.b[0] = &x3
	b4.b[0] = &x4
	f(a1)
	g(&a2)
	sink = h(&b1)
	h(&b2)
	sink = h2(&b1)
	h2(&b4)
	x1 = 17
	println("*sink=", *sink) // Verify that sink addresses x1
	x3 = 42
	sink = k(b3)

    val type: Int,
  ) : MappedRange {
    val b1: Int
      get() =
        when (type) {
          TYPE_IGNORED -> 119
          TYPE_VALID -> 120
          TYPE_DISALLOWED -> 121
          else -> error("unexpected type: $type")
        }
  }

  data class Inline1(
    override val rangeStart: Int,
    private val mappedTo: ByteString,
  ) : MappedRange {
    val b1: Int
      get() {

	// the parser handles GoDestroySyscall wrong, then we
	// have a self-steal here potentially that doesn't make
	// sense.
	b1 := g.Batch(trace.ThreadID(0), 0)
	b1.Event("ProcStatus", trace.ProcID(1), go122.ProcIdle)
	b1.Event("ProcStart", trace.ProcID(1), testgen.Seq(1))
	b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(3), trace.ThreadID(0))

func diff(m0, m1 image.Image) error {
	b0, b1 := m0.Bounds(), m1.Bounds()
	if !b0.Size().Eq(b1.Size()) {
		return fmt.Errorf("dimensions differ: %v vs %v", b0, b1)
	}
	dx := b1.Min.X - b0.Min.X
	dy := b1.Min.Y - b0.Min.Y
	for y := b0.Min.Y; y < b0.Max.Y; y++ {
		for x := b0.Min.X; x < b0.Max.X; x++ {
			c0 := m0.At(x, y)
			c1 := m1.At(x+dx, y+dy)
			r0, g0, b0, a0 := c0.RGBA()
			r1, g1, b1, a1 := c1.RGBA()

        def a1 = file("a/1.txt") << "a/1"
        def b1 = file("b/1.txt") << "b/1"
        def fileResolver = TestFiles.fileCollectionFactory(testDirectory)

        when:
        def a = fileResolver.resolving(["a"]).asFileTree
        def b = fileResolver.resolving(["b"]).asFileTree
        def composite = newCompositeFileTree([a, b])

        then:
        composite.files == [a1, b1].toSet()
    }

    def "can visit all files"() {

	b0, err0 := io.ReadAll(golden)
	b1, err1 := io.ReadAll(lzwr)
	if err0 != nil {
		t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err0)
		return
	}
	if err1 != nil {
		t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err1)
		return
	}
	if len(b1) != len(b0) {
		t.Errorf("%s (order=%d litWidth=%d): length mismatch %d != %d", fn, order, litWidth, len(b1), len(b0))
		return
	}

replace (
	a v0.1.0 => ./a1
	b v0.1.0 => ./b1
	c v0.1.0 => ./c1
	c v0.2.0 => ./c2
)
-- a1/go.mod --
module a

go 1.17

require b v0.1.0
-- a1/a.go --
package a
-- a1/a_test.go --
package a_test

import _ "b/x"
-- b1/go.mod --
module b

go 1.17

require c v0.1.0
-- b1/x/x.go --
package x
-- b1/y/y.go --
package y

import "c"