fails:A block taking |(a, b)| arguments raises a TypeError if #to_ary does not return an Array
fails:A block yielded a single Array assigns elements to optional arguments
fails:A block yielded a single Array calls #to_hash on the last element if keyword arguments are present
fails:A block yielded a single Array assigns the last element to a non-keyword argument if #to_hash returns nil
fails:A block yielded a single Array calls #to_hash on the element that maps to the keyword arguments
fails:A block yielded a single Array raises a TypeError if #to_hash does not return a Hash
fails:A block yielded a single Array raises the error raised inside #to_hash
fails:A block yielded a single Object receives the object if #to_ary returns nil
fails:A block yielded a single Array assigns elements to required arguments when a keyword rest argument is present
