All today. I have been trying to carefully craft searches on Google and Stack Overflow. I wish Google Code Search were still around, or that Github code search were better.
Apparently this was mentioned in a problem set for MIT edX course 6.00.1x in 2014. Then maybe someone then tried to have the internet do their homework for them (this may also be the case for some of the posts in my parent comment):
OP (2021): https://arxiv.org/abs/2110.01111
Stack Overflow (2021, linked by 'Xophmeister in this discussion): https://stackoverflow.com/questions/69437526/what-is-this-od...
Stack Overflow (2021, linked from previous): https://stackoverflow.com/revisions/69435932/1
Stack Overflow with 5 downvotes! (2020): https://stackoverflow.com/questions/63214115/what-is-the-nam...
Stack Overflow (2020): https://stackoverflow.com/questions/59802669/pointer-array-s...
Computer Science Stack Exchange (2015, linked by 'GistNoesis in this discussion): https://cs.stackexchange.com/questions/45348/why-does-this-s...
Stack Overflow (2014!): https://stackoverflow.com/questions/25276619/how-should-i-an...
Reddit (2014, same as previous): https://www.reddit.com/r/algorithms/comments/2dect7/how_shou...