With just that prompt, Copilot keeps writing a comment about the function but never actually writes the function. Prompting to actually write the function by starting it with `func` gives:

    // A Go function to swap the sixth bit and seventeenth bit of a 32-bit signed integer.
    func swapBits(x int32) int32 {
        return ((x & 0x0F) << 28) | ((x & 0xF0000000) >> 28)
    }