I wrote a small program in Algol 68 once. It was horrible because it didn't even have heap allocation in the language, so things you'd think of doing in C (e.g., tree data structures) just didn't work. That and all the compiler errors were pure numerical codes which you had to go look up in the manual (not provided). And forget about getting line numbers.

I am very much glad I wasn't alive at the time this was the state of the art.