balazske added a comment. I am still unsure about how this checker works if the function to check is "modeled" or evaluated by another checker. Then the function may have already a constrained value at the PostCall event (for example if a `malloc` fails) and the basic idea of this checker that the constraints on the return value indicate the checks that the program makes does not work. So it may be better to check for the initial constraint somehow and if found ignore that function. Or create a new state where the function call's value is not constrained.
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