GCData:   gcdata,
	}
	s := "bucket(" + stringFor(ktyp) + "," + stringFor(etyp) + ")"
	b.Str = resolveReflectName(newName(s, "", false, false))
	return b
}

func (t *rtype) gcSlice(begin, end uintptr) []byte {
	return (*[1 << 30]byte)(unsafe.Pointer(t.t.GCData))[begin:end:end]
}

// emitGCMask writes the GC mask for [n]typ into out, starting at bit
// offset base.