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                                            Stefan

Each error message should mention the right line number and position.

It could be, and it's one that crossed my mind before, but I wonder if there's a more elegant solution. I think it would be more beneficial if each parsed...

Add syntax highlighting.

Suggestion: ![syntax](https://user-images.githubusercontent.com/49342/36627409-8c0498aa-1942-11e8-8d08-2b255585752a.png)

Better "whitespace" checking.

I added a WHITESPACE character range in b0c1d1b, because some students had trouble with the ALT+SPACE character in the workshop. This range is not complete.

Better "whitespace" checking.

I think it's these: https://stackoverflow.com/questions/6073637/javascript-regex-whitespace-characters charcodes: 9, 10, 11, 12, 13, 32, 160, 8232, 8233 Maybe there's more?