More than just a blank square for broken deploy links

Not sure how common that is, but my (4-year old) CIS194 lecture notes are (expectedly and unavoidably) beginning to bitrot, and many code snippets no longer compile. That’s ok. It's just unfortunate that it leaves these unhelpful white squares on pages like
https://www.cis.upenn.edu/~cis194/fall16/hw/02-ho-datatypes.html

Maybe URls like `https://code.world/run.html?mode=haskell&dhash=Dal2TK1RkY3oFhVAlSz1YAw` should return some cute, nice, apologetic image saying “sorry, this doesn’t compile”, so that viewers know that that something should be or was there, and that they didn’t do anything stupid.