string.pack not throwing overflow error

[Baileyeatspizza]

So I build luau as normal and ran make test

what's happening is that its expecting string.pack("<I" .. I, -1) to throw an error but it doesn't it actually just returns nothing

after more testing using this simple command line version of what that script is doing
for i = 1, 3 do local umax = bit32.lshift(1, i * 8) - 1 local max = bit32.rshift(umax, 1) local min = -max-1 print("Testing") print("Result = ",pcall(string.pack, "<I" .. i, min)) end

I found that it works as intended in Roblox Studio

but fails in luau

so I'm just assuming the function isn't throwing an overflow error for whatever reason

weirdly enough what I run unpack on the packed string it produces this in luau

whereas in Roblox it well...

again for convenience here is the code for that simple test
for i = 1, 3 do local umax = bit32.lshift(1, i * 8) - 1 local max = bit32.rshift(umax, 1) local min = -max-1 print("Testing") print(string.unpack(string.pack("<I" .. i, min), "<I")) end

compiled using: make config=release luau luau-analyze
compiled version: 0.503 (latest release I just downloaded the repo)

a few things to note:
I tried running make test multiple times always failed
I tried reinstalling the tests still failed
I tried compiling with cmake it still failed

its a pretty weird bug how it works in Roblox tests but not in luau tests

should also mention I'm running macOS Monterey Version 12.0.1 (21A559)
Apple M1 chip

oh and final note is that it fails for all overflow errors not just the <I one I showed off in tests that's just the first one that fails in make test

[zeux]

Thanks! This is a bug specific to ARM architecture. It so happens that we already fixed it last week but the fix didn't make it to this repository yet. Let's keep this open, the fix should land here on Friday.