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@ddrake @quephird @jrose
Yes! “You cannot change the values of a variable” is a special day in the p-lang class: I show them some very, very, very basic Elm completely cold, and ask: “What can we ask about this language? What experiments will tell us what kind of language it is?” We do some tinkering with things they think they already know. We read the error messages carefully. It usually takes about 30-40 minutes for the class discussion to reach the point of “oh, wow, `=` doesn’t mean what we think it means in this language,” and it breaks their brain every time.