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One of the most useful software enineering things taught to me recently is "The only things tests ensure is that your code passes the tests."

Brought to you today by:

My C compiler's parser passes the tests, but the AST is completely wrong.

Because the tests were wrong.

I only found out because today I implemented a function to print the AST as a dot/graphviz graph.

Terminal nodes like "(" had children, which is impossible.

The tests and impl being wrong was kinda expected tbh.

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