As for reference: [wiki.haskell.org Reference card](https://wiki.haskell.org/Reference_card#Comments) [Beginning Haskell: A Project-Based Approach](https://books.google.ru/books?id=IZsQAwAAQBAJ&pg=PA356&lpg=PA356&dq=haskell+single-line+comment&source=bl&ots=Dqqd8AKZzk&sig=9c5wRDsU9QqAqypIjP1AGSHpI4E&hl=en&sa=X&ved=0ahUKEwiA5O2D1cHMAhUEGZoKHaCVCn4Q6AEIWDAJ#v=onepage&q=haskell%20single-line%20comment&f=false)
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