# Property-Based Testing with PropEr, Erlang, and Elixir: missing closing parantheses (page 24)

**URL:** <https://forum.devtalk.com/t/property-based-testing-with-proper-erlang-and-elixir-missing-closing-parantheses-page-24/37921>\
**Category:** PragProg Customers\
**Tags:** book-property-based-testing-with-proper-erlang-and-elixir, errata\
**Created:** [26 January 2022 14:31 UTC](https://forum.devtalk.com/t/property-based-testing-with-proper-erlang-and-elixir-missing-closing-parantheses-page-24/37921 "2022-01-26T14:31:07Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![axler8r](https://forum.devtalk.com/user_avatar/forum.devtalk.com/axler8r/32/3794_2.png) [@axler8r](https://forum.devtalk.com/u/axler8r)\
**Post date:** [26 January 2022 14:31 UTC](https://forum.devtalk.com/t/property-based-testing-with-proper-erlang-and-elixir-missing-closing-parantheses-page-24/37921/1 "2022-01-26T14:31:07Z")

</div>

proper\_gen:pick  
( → 1  
proper\_types:non\_empty  
( → 2  
proper\_types:list  
( → 3  
proper\_types:number  
( → 4  
) → 4  
) → 3  
) → 2  
 ← missing  
.