Pardon me if this is a stupid/frequently asked question... The GHC Prelude has some extensions to the Prelude in Haskell 98 or Haskell 2010. For instance, it has the Applicative type class, whose bindings overlap with some old code of mine. Where are these non-standard extensions documented? The Applicative class is documented at https://downloads.haskell.org/~ghc/latest/docs/html/libraries/base-4.9.0.0/P... but it's not picked out as something non-standard. I didn't find it documented where I would have expected in the GHC docs at https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/bugs.html#ha... nor did I see a way to get a standards-compliant prelude? In this particular case I'll probably rework my code, as Applicative seems like a reasonable core addition. (I am a little annoyed that it uses so many short infix operators; I was using (*>).) I'm just surprised not to see it documented anywhere. Thanks, Dylan Thurston