}

	var mask image.Image
	switch mcm {
	case nil:
		// No-op.
	case color.AlphaModel:
		mask1 := image.NewAlpha(image.Rect(0, 0, srcw, srch))
		for y := 0; y < srch; y++ {
			for x := 0; x < srcw; x++ {
				a := uint8((23*x + 29*y) % 0x100)
				// Glyph masks are typically mostly zero,
				// so we only set a quarter of mask1's pixels.
				if a >= 0xc0 {

			// Check if s[i:] contains a valid WTF-8 encoded surrogate.
			if sc := s[i:]; len(sc) >= 3 && sc[0] == 0xED && 0xA0 <= sc[1] && sc[1] <= 0xBF && 0x80 <= sc[2] && sc[2] <= 0xBF {
				r = rune(sc[0]&mask3)<<12 + rune(sc[1]&maskx)<<6 + rune(sc[2]&maskx)
				buf = append(buf, uint16(r))
				i += 3
				continue
			}
		}
		i += size
		buf = utf16.AppendRune(buf, r)
	}
	return buf
}

// decodeWTF16 returns the WTF-8 encoding of

		}
		mask &^= 1 << uint64(i)
	}
	*s = mask
	return nil
}

// And performs and operation on all bits in masks
func (s *bitMask) And(masks ...BitMask) {
	for _, m := range masks {
		*s &= *m.(*bitMask)
	}
}

// Or performs or operation on all bits in masks
func (s *bitMask) Or(masks ...BitMask) {
	for _, m := range masks {
		*s |= *m.(*bitMask)
	}
}

	src0 := image.NewRGBA(image.Rect(0, 0, 100, 100))
	mask0 := image.NewRGBA(image.Rect(0, 0, 100, 100))
	for _, c := range clipTests {
		dst := dst0.SubImage(c.dr).(*image.RGBA)
		src := src0.SubImage(c.sr).(*image.RGBA)
		r, sp, mp := c.r, c.sp, c.mp
		if c.nilMask {
			clip(dst, &r, src, &sp, nil, nil)
		} else {
			clip(dst, &r, src, &sp, mask0.SubImage(c.mr), &mp)
		}

		if i >= 56 {
			// we might have to write the length here if all fit in one block
			d.x[i] |= mask1b & length[i-56]
		}
	}

	// compress, and only keep the digest if all fit in one block
	block(d, d.x[:])

	var digest [Size]byte
	for i, s := range d.h {
		digest[i*4] = mask1b & byte(s>>24)
		digest[i*4+1] = mask1b & byte(s>>16)
		digest[i*4+2] = mask1b & byte(s>>8)

// significant bit (in hi) and bit 127 is the lowest (lo&1).
type uint128 struct {
	hi uint64
	lo uint64
}

// mask6 returns a uint128 bitmask with the topmost n bits of a
// 128-bit number.
func mask6(n int) uint128 {
	return uint128{^(^uint64(0) >> n), ^uint64(0) << (128 - n)}
}

// isZero reports whether u == 0.
//

    def dependsOnUnionOfDependenciesOfSourceCollections() {
        def task1 = Stub(Task)
        def task2 = Stub(Task)
        def task3 = Stub(Task)
        def source1 = Stub(FileCollectionInternal)
        def source2 = Stub(FileCollectionInternal)

        given:
        source1.visitDependencies(_) >> { TaskDependencyResolveContext context ->
            context.add(task1)
            context.add(task2)
        }

        def task1 = Stub(Task)
        def task2 = Stub(Task)
        def task3 = Stub(Task)
        def selection1 = Stub(TaskSelection)
        def selection2 = Stub(TaskSelection)

        given:
        _ * gradle.startParameter >> startParameters
        _ * startParameters.taskRequests >> [request1, request2]

        def tasks1 = [task1, task2] as Set
        _ * selection1.tasks >> tasks1

        then:
        result.keySet() == ['task1', 'task2'] as Set

        and:
        1 * tasks.discoverTasks()
        1 * tasks.names >> (['task1', 'task2'] as SortedSet)
        0 * tasks._

        when:
        def matches = asTasks(result['task1'])

        then:
        matches == [task1]

        and:
        1 * tasks.getByName('task1') >> task1
        0 * tasks._
    }

		// may be larger than we expect.
		return
	}
	t.Errorf("bad GC program for %v:\nwant %+v\ngot  %+v", name, mask0, mask)
}

func trimDead(mask []byte) []byte {
	for len(mask) > 0 && mask[len(mask)-1] == typeScalar {
		mask = mask[:len(mask)-1]
	}
	return mask
}

var infoPtr = []byte{typePointer}

type Ptr struct {
	*byte
}