Brendan Hansknecht (Dec 09 2023 at 20:25): Brendan Hansknecht (Dec 09 2023 at 20:25):Just curious has anyone else seen roc give the wrong panic message?
Recently I saw a case of "multiplication overflow", but it came from an addition.
Richard Feldman (Dec 09 2023 at 20:26):I've specifically seen reports of that one
Richard Feldman (Dec 09 2023 at 20:27):of it saying multiplication overflow where it should have said something else (I heard about it in the case of subtraction instead of addition)
Richard Feldman (Dec 09 2023 at 20:30):only kinda related, but I think we could make that error message a lot more helpful, especially for people not used to different number types - e.g. U8 multiplication overflowed. U8s range from 0 to 255, and this multiplication resulted in a number outside those bounds. Converting to a larger number size (e.g. by calling Num.toU16 on both numbers) before multiplying would increase these bounds.
Ryan Bates (Dec 09 2023 at 20:55):I would appreciate a more clarified error message. You could also suggest using signed int version if they attempt to go below zero.
Brendan Hansknecht (Dec 09 2023 at 21:04):Could also mention the saturating or wrapping versions of the functions
Richard Feldman (Dec 09 2023 at 21:05):maybe just link to some docs on how to handle overflow
Declan Joseph Maguire (Dec 10 2023 at 02:10):Wait, does Roc have the wrapping and saturating version of arithmetic infix operators, like Zig does? Or just the regular addWrap et. al. functions?
Brendan Hansknecht (Dec 10 2023 at 02:10):functions only
Declan Joseph Maguire (Dec 10 2023 at 02:12):Damn, those infix versions are super nice in Zig. They basically solve all the ergonomic problems of always crashing on overflow, if you're trying to write something very numerical.
Last updated: Jul 26 2025 at 12:14 UTC