Still alive for issue #2168

[cyk2018]

Describe the Bug

null pointer for auto free.

Steps to Reproduce

1. following the step in thie issue

Expected Behavior

May be two 42 in console?
I follow one article written by this author, and I find that the result in console still throw null pointer exception.

Additional Context

I found the "the_answer" function has been fixed like this:

        const ptr = this.__destroy_into_raw();
        const ret = wasm.answer_the_answer(ptr);
        return ret >>> 0;

but the "__destroy_into_raw" function will work like this:

        const ptr = this.__wbg_ptr;
        this.__wbg_ptr = 0;
        AnswerFinalization.unregister(this);
        return ptr;

and the "__wbg_ptr" will be 0 when second-call.

[cyk2018]

@alexcrichton may be you can check this problem? Thanks!

[daxpedda]

Closing in favor of #2168.