Maps.dfy(200,11): 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.
Maps.dfy(78,7): Error: element might not be in domain
Maps.dfy(128,17): Error: assertion might not hold
Maps.dfy(220,36): Error: key expressions might be referring to the same value
Maps.dfy(226,36): Error: key expressions might be referring to the same value
Maps.dfy(232,37): Error: key expressions might be referring to the same value
Maps.dfy(234,24): Error: key expressions might be referring to the same value
Maps.dfy(241,41): Error: function precondition could not be proved
Maps.dfy(215,13): Related location: this proposition could not be proved
Maps.dfy(243,36): Error: function precondition could not be proved
Maps.dfy(215,13): Related location: this proposition could not be proved
Maps.dfy(243,37): Error: key expressions might be referring to the same value
Maps.dfy(264,54): Error: assertion might not hold
Maps.dfy(309,11): Error: index out of range
Maps.dfy(311,16): Error: value does not satisfy the subset constraints of 'nat'
Maps.dfy(317,11): Error: value does not satisfy the subset constraints of 'nat'
Maps.dfy(319,16): Error: new number of occurrences might be negative
Maps.dfy(328,11): Error: value does not satisfy the subset constraints of 'nat'
Maps.dfy(330,17): Error: value does not satisfy the subset constraints of 'nat'
Maps.dfy(339,11): Error: index out of range
Maps.dfy(341,16): Error: value of expression (of type 'Elem?') is not known to be an instance of type 'Elem', because it might be null
Maps.dfy(347,11): Error: value of expression (of type 'Elem?') is not known to be an instance of type 'Elem', because it might be null
Maps.dfy(349,16): Error: new number of occurrences might be negative
Maps.dfy(358,11): Error: value of expression (of type 'Elem?') is not known to be an instance of type 'Elem', because it might be null
Maps.dfy(360,16): Error: value of expression (of type 'Elem?') is not known to be an instance of type 'Elem', because it might be null
Maps.dfy(424,13): Error: assertion might not hold
Maps.dfy(429,17): Error: assertion might not hold
Maps.dfy(430,13): Error: assertion might not hold
Maps.dfy(442,13): Error: assertion might not hold
Maps.dfy(447,17): Error: assertion might not hold
Maps.dfy(448,13): Error: assertion might not hold
Maps.dfy(520,18): Error: assertion might not hold
Maps.dfy(525,20): Error: assertion might not hold
Maps.dfy(562,2): Error: decreases expression might not decrease
Maps.dfy(576,2): Error: decreases expression might not decrease

Dafny program verifier finished with 49 verified, 32 errors
