Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
A solution does not meet Equi-X’s ordering requirements.
This error occurs independently of the specific challenge
string. The lexicographic ordering constraints of a well
formed Equi-X solution were not met.
Failed hash sum verification of a challenge and solution.
The tree of hash sums computed from the solution and challenge
are required to have a number of low bits zeroed on each level.
One of these tests failed, and the solution is not valid.