[fxtentacle]

Another niche: Many banks in Europe still use M4, but the existing maintainers are growing old and retiring.

[jzwinck]

What do they use m4 for?

[benji-york]

m4 the macro language?

[fxtentacle]

Yes. I heard about it being used for email automation and reporting.

Unrelated talk about the M4 language that I'm referring to: https://m.youtube.com/watch?v=ULZxHSPWn98