Is there something about 是在 that is meaningful in 让任意的值是在一个上下文当中? I was reading this article when I came across this:


  让任意的值是在一个上下文当中. 现在的情况你可以想象一个可以把值放进去的盒子


Because of the English version, I know that this is saying:


  Let an arbitrary value be in a context. You can think of this as a box that you can put the value in.


However, I've never seen 是 and 在 together like this with 让 earlier in then sentence. I thought that 在 by itself would have been fine. Is there something about 是在 that is meaningful in this sentence?
The article in the first link is clearly machine-translated from the original version in the second link with some partials not even translated. A lot of the sentences are difficult to understand, if they make any sense at all. 让任意的值是在一个上下文当中 is just wrong in Chinese. One proper translation might be 把任意值放到上下文当中.