LetExpr.dfy(109,22): Error: assertion violation
Execution trace:
    (0,0): anon0
    (0,0): anon11_Then
LetExpr.dfy(9,11): Error: assertion violation
Execution trace:
    (0,0): anon0
LetExpr.dfy(254,18): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon5_Then
LetExpr.dfy(257,18): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon6_Then
LetExpr.dfy(259,23): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon6_Else
LetExpr.dfy(288,13): Error: RHS is not certain to look like the pattern 'Agnes'
Execution trace:
    (0,0): anon0
    (0,0): anon3_Else
LetExpr.dfy(305,41): Error: value assigned to a nat must be non-negative
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else
LetExpr.dfy(307,11): Error: assertion violation
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else
LetExpr.dfy(317,11): 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
LetExpr.dfy.tmp.dprint.dfy(162,2): Warning: /!\ No terms found to trigger on.

Dafny program verifier finished with 0 verified, 0 errors