suppress_request.erl:21: Expression produces a value of type 
          {'a', 'b'}, but this value is unmatched
suppress_request.erl:25: Expression produces a value of type 
          {'a', 'b'}, but this value is unmatched
suppress_request.erl:39: Guard test 
          2 =:= 
          A :: fun((none()) -> no_return()) can never succeed
suppress_request.erl:7: Type specification suppress_request:test1
          ('a' | 'b') -> 'ok' is a subtype of the success typing: suppress_request:test1
          ('a' | 'b' | 'c') -> 'ok'