While ok for your example code, I generally dislike this style because:

• It tends to be error-prone in that it is easy to silently ignore error returns. For example, replace warn above with a function that may return failure.
• It doesn't scale well as the code is maintained. How should you change the code above, if in addition to calling warn, you want to do something else? Using a block if or block do {} construct, you simply add a new statement, a less tricky one line change that's easier to review in revision control.

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