Pinto Pasquale authored Apr 06, 2020 and Ivan Gromakovskii committed Apr 07, 2020

Problem: Indigo's tutorial does not actually build, because its
example modules are not included in the cabal file.
This was caused by the modules having thir name starting with a
number instead of a capital letter.
Additionally, recent updates have broken these modules so they
would not compile anyway.

Solution: rename modules to include them in the cabal file, fix what
was broken by recent changes.