============ after processor `spec_instrumenter` ================

[variant verification]
pub fun Trafo::opaque_caller($t0|x: u64): u64 {
     var $t1: bool
     var $t2: num
     var $t3: u64
     var $t4: bool
     var $t5: u64
  0: assume WellFormed($t0)
  1: trace_local[x]($t0)
     # >> opaque call: $t1 := Trafo::opaque_decr($t0)
  2: nop
  3: assume Eq($t1, Eq<u64>($t0, 0))
  4: if ($t1) goto 5 else goto 8
  5: label L4
  6: trace_abort($t2)
  7: goto 27
  8: label L3
  9: assume Eq<u64>($t3, Sub($t0, 1))
 10: assume WellFormed($t3)
     # << opaque call: $t1 := Trafo::opaque_decr($t0)
 11: nop
     # >> opaque call: $t2 := Trafo::opaque_decr($t1)
 12: nop
 13: assume Eq($t4, Eq<u64>($t3, 0))
 14: if ($t4) goto 15 else goto 18
 15: label L6
 16: trace_abort($t2)
 17: goto 27
 18: label L5
 19: assume Eq<u64>($t5, Sub($t3, 1))
 20: assume WellFormed($t5)
     # << opaque call: $t2 := Trafo::opaque_decr($t1)
 21: nop
 22: trace_return[0]($t5)
 23: label L1
     # VC: function does not abort under this condition at opaque.move:18:7+16
 24: assert Not(Lt($t0, 2))
     # VC: post-condition does not hold at opaque.move:19:7+24
 25: assert Eq<u64>($t5, Sub($t0, 2))
 26: return $t5
 27: label L2
     # VC: abort not covered by any of the `aborts_if` clauses at opaque.move:17:3+82
 28: assert Lt($t0, 2)
 29: abort($t2)
}


[variant verification]
pub fun Trafo::opaque_decr($t0|x: u64): u64 {
     var $t1: u64
     var $t2: u64
     var $t3: num
  0: assume WellFormed($t0)
  1: trace_local[x]($t0)
  2: $t1 := 1
  3: $t2 := -($t0, $t1) on_abort goto 9 with $t3
  4: trace_return[0]($t2)
  5: label L1
     # VC: function does not abort under this condition at opaque.move:10:7+17
  6: assert Not(Eq<u64>($t0, 0))
     # VC: post-condition does not hold at opaque.move:11:7+24
  7: assert Eq<u64>($t2, Sub($t0, 1))
  8: return $t2
  9: label L2
     # VC: abort not covered by any of the `aborts_if` clauses at opaque.move:8:3+102
 10: assert Eq<u64>($t0, 0)
 11: abort($t3)
}