#!/usr/bin/env perl

{
  package MyModule;

  use strict;
  use warnings;
  use Carp;

  sub a { croak 'croaking' }
  sub b { die 'dying' }

  sub dispatch {
    my $class = shift;
    my $method = shift or croak 'no method name supplied';

    $class->$method;
  }
}

while (<>) {
  chomp;
  next unless /\S/;

  eval { MyModule->dispatch($_) };
  warn $@ if $@;
}