Stopwords for programming languages (for, while, print,...)
Stop words are common words in a language and they are usually removed when there appearance is not indicative to the analysis goal.

Suppose our goal is to text mine and find out if a given text is about sports or politics. If we use a bag of words, "not" is probably a stop word we should remove since it is probably not indicative of either categories.

On the other hand, if we would like to differ between "This article will not discuss politics" and "this article will discuss politics", we must not remove "not".

The examples you gave look like programming languages reserved words. In most languages you can find this documentation and skip the learning phase. Looking at the frequent tokens will probably also give you the reserved words (and probably plenty of English stop words that will appear in the remarks). 

However, before utilising such a list, be sure that neglecting them will serve your goal. In case that typing them doesn't differ from typing other words, you might better leave them. This way you will have more data the represent better the user behaviour.