func goPanicExtendSliceAlen(hi int, lo uint, y int) {
	panicCheck1(getcallerpc(), "slice bounds out of range")
	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: true, y: y, code: boundsSliceAlen})
}
func goPanicExtendSliceAlenU(hi uint, lo uint, y int) {
	panicCheck1(getcallerpc(), "slice bounds out of range")
	panic(boundsError{x: int64(hi)<<32 + int64(lo), signed: false, y: y, code: boundsSliceAlen})
}