Install libghc-safesemaphore-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-safesemaphore-doc
Description:
exception safe alternatives to QSem, QSemN, and SampleVar - documentation; documentation
This is an alternative to the deprecated QSem, QSemN, and SampleVar in GHC base. Those base modules are not exception safe and can be broken by killThread. . This package provides the documentation for a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
Homepage: https://github.com/ChrisKuklewicz/SafeSemaphore
Version: 0.10.1-7build1
Section: universe/doc