text.dfy(12,2): Error: a postcondition could not be proved on this return path
text.dfy(8,17): Related location: this is the postcondition that could not be proved
text.dfy(27,2): Error: a postcondition could not be proved on this return path
text.dfy(23,17): Related location: this is the postcondition that could not be proved

Dafny program verifier finished with 2 verified, 2 errors
