book: ch03-01(shadowing): Clarify RHS evaluation order#4764
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Explicitly state that the right-hand side of a shadowing let binding is evaluated before the new variable comes into existence. The original text implied this by saying "taking the original value", but did not make the mechanism clear, which might be confusing.
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Explicitly state that the right-hand side of a shadowing let binding is evaluated before the new variable comes into existence. The original text implied this by saying "taking the original value", but did not make the mechanism clear, which might be confusing.