Comment by mikewarot

Metamine had a amazing demo[1], which is only still with us on the Internet Archive. I've fawned over it before[2], but suffice it to say it was a normal programming language plus a magical equals which kept the left side of an assignment updated after the fact, for the life of the program. (Along with the normal non-magical one) The amazing part is that the author, Ymte Jan Broekhuizen, had coherent rules figured out for mixing declarative and imperitive programming. Figuring those out is a minor miracle in my mind.

[1] http://web.archive.org/web/20201014024057/https://www.youtub...

[2] https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...