FP::Repl::Dependencies - hack to load Repl dependencies
use Chj::TEST use=> 'FP::Repl::Dependencies';
Term::ReadLine::Gnu does not allow to check for its presence directly. When require'ing Term::ReadLine::Gnu, it gives an error saying "It is invalid to load Term::ReadLine::Gnu directly.". That makes it appear as unloadable when in fact it is present. And depending on just Term::ReadLine is not enough, the repl will then fail at runtime. Stupid.