When do you know a language?

One of my teacher used to say that we don’t know Matlab because we don’t know that there is a guide command which does what it does. Yesterday, I’ve created my Haskellers profile and I saw that there are a lot of topics in Haskell about which I know almost nothing. This made me write this post, trying to get the answer to the following question: «How much should you know about one language to be certain that you can say you know the language?».

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