1970's was MDL (a lisp dialect of sorts), later versions used a specialised subset:
In 1980 Marc Blank and Joel Berez adapted the MDL language to create a subset called ZIL (Zork Implementation Language) which was used extensively by Infocom to create their award winning games.
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What language is this written in?
1970's was MDL (a lisp dialect of sorts), later versions used a specialised subset:
https://en.wikipedia.org/wiki/MDL_(programming_language)The README says it was written in MDL.
https://en.m.wikipedia.org/wiki/MDL_(programming_language)