LetExpr.dfy(108,23): Error: assertion violation
Execution trace:
    (0,0): anon0
    (0,0): anon11_Then
LetExpr.dfy(8,12): Error: assertion violation
Execution trace:
    (0,0): anon0
LetExpr.dfy(253,19): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon5_Then
LetExpr.dfy(256,19): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon6_Then
LetExpr.dfy(258,24): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon6_Else
LetExpr.dfy(287,14): Error: RHS is not certain to look like the pattern 'Agnes'
Execution trace:
    (0,0): anon0
    (0,0): anon3_Else
LetExpr.dfy(304,42): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon6_Else
LetExpr.dfy(306,12): Error: assertion violation
Execution trace:
    (0,0): anon0
    (0,0): anon6_Else
LetExpr.dfy(316,12): Error: to be compilable, the value of a let-such-that expression must be uniquely determined
Execution trace:
    (0,0): anon0
    (0,0): anon10_Then

Dafny program verifier finished with 39 verified, 9 errors

Dafny program verifier finished with 0 verified, 0 errors