Value from coroutine.yield() not returned by coroutine.resume()

[Feuermurmel]

Describe the bug

It seems that values yielded from coroutines become functions, and the value is lost.

[SMMDebug-2024-11-05-22-12-37.zip](https://github.com/user-attachments/files/17639435/SMMDebug-2024-11-05-22-12-37.zip)

To Reproduce

Pasting this code into the EEPROM of a computer and running it will show the problem:

coro = coroutine.create(function()
    coroutine.yield(1)
end)

ok, value = coroutine.resume(coro)

print(type(value))
print(value())
print(value)

When running the code, I get this:

In this case, value is some kind of function instead of the value 1.

Additionally, __tostring does not return a string in this case, which made debugging this issue in a complex application hard. 😅

Expected behavior

Lua usually returns the yielded values from a call to coroutine.resume(). This was working in earlier versions of FicsIt Networks (but I haven't played for about 2 years, so I don't know when this broke).

Additional context

Satisfactory 1.0.0.4, SMM 3.0.3, FicsIt Networks 0.3.24.

Workaround

You can add this snippet to the start of your script to fix the issue. You will need to remove the snippet once the bug has been fixed:

local origResume = _G.coroutine.resume

-- TODO: Workaround for bug in FicsIt networks.
--  coroutine.resume() inserts an additional value before the
--  yielded values.
--  https://github.com/Panakotta00/FicsIt-Networks/issues/351
function _G.coroutine.resume(...)
    local result = table.pack(origResume(...))

    if result[1] then
        table.remove(result, 2)
    end

    return table.unpack(result)
end

[Panakotta00]

Until next update. A simple fix is that the expected value is the third value. Which indeed is not how it should be, and will be fixed in the next update.

coro = coroutine.create(function()
    print("meep")
    coroutine.yield(42)
end)

ok, func, value = coroutine.resume(coro)
print(type(value))
print(func())
print(value)

[Feuermurmel]

Thanks for the quick reply and the workaround! 🥰