tiny.mprompt.promptEnter

1/// Switches to `p`'s stacklet and calls `fun(p, arg)` there, so a caller runs `fun` on a prompt2/// created earlier with `promptCreate`. While `fun` runs, `p` is the calling thread's innermost3/// active prompt. The call returns what `fun` returns when it finishes, and the runtime then4/// releases `p`. The call returns what the yield function returns when the code suspends to `p`.5/// `p` must be new: an active or suspended prompt fails an assertion in safe builds.6pub fn promptEnter(p: *Prompt, fun: StartFn, arg: ?*anyopaque) ?*anyopaque {7    assert(!promptIsActive(p));8    assert(p.resume_point == null);910    var env: EntryEnv = .{11        .prompt = p,12        .fun = fun,13        .arg = arg,14    };15    return promptResume(p, &env);16}

1pub const promptEnter = raw.promptEnter;