This is because `static` is a language keyword while the others are not, for example:

let override­ = 1 // works
let static = 1 // error: keyword 'static' cannot be used as an identifier here

I can understand class being a keyword because class variables also use the word class as a modifier. Maybe I am missing something but static doesn't seem to have the same requirements as the word class so I don't know why it must be a keyword.

That is an interesting question that I'd suggest bringing up on swift-dev, but I'd like to clarify that what sourcekitd reports is expected behavior, based on the language keywords, not a bug.

I did. Nobody responded.
https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20170501/004536.html
Perhaps it is not a sourcekit bug but I am not sure how else to file it. A a user, the only way I can interact with the syntax information is SourceKit.

In the email you ask 'why sourceKit is reporting `static` as a "source.lang.swift.syntaxtype.keyword"', and the answer is because 'static' is a language keyword, as I mentioned here. If you think it should not be a keyword, then that is a different question, targeted towards the language rules.

thats fair. Closing.