mv-model 0.3.2

Move model
Documentation 
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module 0x42::M {

  struct S {
    x: u64,
  }

  spec S {
    global tick: num;

    // Undeclared
    // invariant update ticks = tick + 1;

    // Wrong type
    // invariant update tick = false;

    // Cannot have assignment
    invariant tick = x;

    // Must have assignment
    invariant pack x == 0;
    invariant unpack x == 0;
  }
}