git-issue-2593.dfy(7,24): Warning: Argument to 'old' does not dereference the mutable heap, so this use of 'old' has no effect
git-issue-2593.dfy(7,10): Warning: Could not find a trigger for this quantifier. Without a trigger, the quantifier may cause brittle verification. To silence this warning, add an explicit trigger using the {:trigger} attribute. For more information, see the section quantifier instantiation rules in the reference manual.

Dafny program verifier finished with 0 verified, 0 errors
