git-issue-5017a.dfy(45,18): Error: assertion might not hold
git-issue-5017a.dfy(72,14): Error: assertion might not hold
git-issue-5017a.dfy(79,14): Error: assertion might not hold
git-issue-5017a.dfy(127,18): Error: assertion might not hold

Dafny program verifier finished with 14 verified, 4 errors
