It's all covered by my initial post. It explains that the documentation doesn't define what happens and that it could be implied that it's Undefined Behaviour, it explains what usually happens, and it explains that you can't always count on it happening (in the form of a link to a reply that provides an example where it doesn't happen).

In reply to Re^22: printing unitialized value of the 'do BLOCK' (EXPRESSION vs TERM vs STATEMENT) by ikegami
in thread printing unitialized value of the 'do BLOCK' by rsFalse

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