libghc-map-syntax-doc 0.3-5build1 (amd64 binary) in ubuntu eoan

 Haskell's canonical list of tuples syntax for defining maps is not very
 convenient and also has ambiguous semantics. This package leverages do
 notation to create a lighter syntax that makes semantics explicit and also
 allows the option of fail-fast handling of duplicate keys.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.