Quiz 5
1. How to list all objects in an environment?
2. What is a 'Generic' function?
3. Which function generates a call?
4. What is the difference between `stop()` and `warning()`?
5. Which function parses a string into an expression?
6. How to assign a value in a parent environment?
7. What is an 'expression' object?
8. Which function prints the call stack on error?
9. How to define a new S4 generic?
10. What does the `baseenv()` function return?
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