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On the 7th page of this book there is a tilde (shown by red circle in the picture below) in the definition of toggle. What does the tilde mean ?

enter image description here

jhegedus
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    They're called [lazy patterns](https://www.haskell.org/tutorial/patterns.html#tut-lazy-patterns) – Lee Jun 27 '15 at 14:22
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    Can you [please not post images](https://meta.stackoverflow.com/questions/284577/are-there-any-issues-with-posting-screenshots-of-books-pages) ? – Sibi Jun 27 '15 at 14:31
  • I think the image makes here clearer what is the question. – jhegedus Jun 27 '15 at 15:00

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