CZX

This is related to https://github.com/source-academy/frontend/issues/2883, the errors thrown are similar.

Just a heads up that #1645 will likely affect this PR

Now it's giving me a slightly different error: It seems like Immer is still handling the context objects like environment trees when the CSE Machine gets run, which results in...

Actually, the error only occurs when the code that is written in the playground editor has the circular reference, it seems like the rest of the js-slang context is still...