contract.erl:10: Function t2/0 has no local return
contract.erl:10: The call missing:f(#{'a':=1, 'c':=4}) breaks the contract (#{'a':=1,'b'=>2,'c'=>3}) -> 'ok'
contract.erl:12: Function t3/0 has no local return
contract.erl:12: The call missing:f(#{'a':=1, 'b':=2, 'e':=3}) breaks the contract (#{'a':=1,'b'=>2,'c'=>3}) -> 'ok'
contract.erl:8: Function t1/0 has no local return
contract.erl:8: The call missing:f(#{'b':=2}) breaks the contract (#{'a':=1,'b'=>2,'c'=>3}) -> 'ok'