# Extension or Imitation?
**URL:** https://discourse.haskell.org/t/extension-or-imitation/14203
**Category:** Show and Tell
**Created:** [June 4, 2026, 7:17am UTC](https://discourse.haskell.org/t/extension-or-imitation/14203 "2026-06-04T07:17:17Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@hungryjoe](https://discourse.haskell.org/u/hungryjoe)
#### Post date: [June 4, 2026, 7:17am UTC](https://discourse.haskell.org/t/extension-or-imitation/14203/1 "2026-06-04T07:17:17Z")
I wrote this little Haskell Quiz (with help from some friends); in the style of “CSS or BS”; Can you tell the valid Haskell Language Extensions (based on the GHC docs), from the Impostors?
> **[Extension or Imitation?](https://doscienceto.it/extension-or-imitation/)**
>
> Can you tell the real Haskell Language Extensions from the Imitations?
---
### Author:  [@int-index](https://discourse.haskell.org/u/int-index)
#### Post date: [June 4, 2026, 11:52am UTC](https://discourse.haskell.org/t/extension-or-imitation/14203/2 "2026-06-04T11:52:55Z")
It’s a fun game! Thanks for sharing. I thought I’d easily score 12/12 but I totally fell for the gotchas!
---
### Author:  [@exaexa](https://discourse.haskell.org/u/exaexa)
#### Post date: [June 7, 2026, 11:58am UTC](https://discourse.haskell.org/t/extension-or-imitation/14203/3 "2026-06-07T11:58:25Z")
6/12 haha
They lured me to accept `RebindableSemicolons` , and man, that looks too good to be true. 😂