maps1.erl:43: Function t3/0 has no local return
maps1.erl:44: The call maps1:foo(~{'greger'=>3, ~{'arne'=>'anka'}~=>45}~,1) will never return since it differs in the 1st and 2nd argument from the success typing arguments: (#{'beta':=_, ...},'b')
maps1.erl:52: The variable Mod can never match since previous clauses completely covered the type #{}