I use CoPilot pretty much as a smarter autocomplete that can sometimes guess what I'm planning to type next. I find it's not so good at answering prompts, but if I type:

    r = (rgba >> 24) & 0xff;

...and then pause, it's pretty good at guessing:

    g = (rgba >> 16) & 0xff;
    b = (rgba >> 8) & 0xff;
    a = rgba & 0xff;

... for the next few lines. I don't really ask it to do more heavy lifting than that sort of thing. Certainly nothing like "Write this full app for me with these requirements [...]"