https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=%22M4%22&sort=by...

		dang on April 3, 2020 \| parent \| context \| favorite \| on: Notes on the M4 Macro Language (2008) https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu... has many M4s but these two threads sound related: 2018: https://news.ycombinator.com/item?id=17781062 2015: https://news.ycombinator.com/item?id=10054484