git-issue-2511.dfy(14,11): Error: assertion might not hold
git-issue-2511.dfy(24,12): Error: decreases clause might not decrease
git-issue-2511.dfy(51,4): Error: method's (possibly automatically generated) decreases clause must be below or equal to that in the trait

Dafny program verifier finished with 3 verified, 3 errors
