git-issue-921.dfy(8,26): Error: value does not satisfy the subset constraints of 'ShortString'
git-issue-921.dfy(12,62): Error: value does not satisfy the subset constraints of 'ShortString'
git-issue-921.dfy(20,32): Error: value does not satisfy the subset constraints of 'ShortString'

Dafny program verifier finished with 2 verified, 3 errors
