Reporter: TumoiYorozu (Japanese tweet: https://twitter.com/TumoiYorozu/status/1303198406513291264 ) It seems that some Visual Studio failed to compile internal_math. We need to take a look into. As a temporary solution, replacing ``` for (long long a : {2, 7, 61}) { ``` into ``` int v[] = { 2, 7, 61 }; for (long long a : v) { ``` works, but we have to find the reason.