func bitslice(x: var Int128; slice: Slice[int]) {.inline, ...raises: [], tags: [],
    forbids: [].}

func bitslice(x: var UInt128; slice: Slice[int]) {.inline, ...raises: [], tags: [],
    forbids: [].}

func clearBit[T: SomeInt128](x: var T; bit: range[0 .. 127]) {.inline.}

func countLeadingZeroBits(x: SomeInt128): int {.inline.}

func countSetBits(x: SomeInt128): int {.inline.}

func countTrailingZeroBits(x: SomeInt128): int {.inline.}

func fastLog2(x: SomeInt128): int {.inline.}

func flipBit[T: SomeInt128](x: var T; bit: range[0 .. 127]) {.inline.}

func setBit[T: SomeInt128](x: var T; bit: range[0 .. 127]) {.inline.}

func testBit[T: SomeInt128](x: var T; bit: range[0 .. 127]): bool {.inline.}