I phrased that a bit wrong: my experience (from talking to the Haskellers in my company) is that Haskellers generally prefer to turn on a bunch of extensions wh

I phrased that a bit wrong: my experience (from talking to the Haskellers in my company) is that Haskellers generally prefer to turn on a bunch of extensions when they write code. So, while you might be able to write pure Haskell98, it tends not to be idiomatic to do so.