Install libghc-intern-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libghc-intern-doc
Description:
hash consing for data types - library documentation
Efficient hash-consing for arbitrary Haskell data types. . This package contains the library documentation for intern.
Homepage: http://github.com/ekmett/intern/
Version: 0.9.1.4-3build1
Section: universe/doc