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Update errors5.rs
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// This exercise is an altered version of the `errors4` exercise. It uses some
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// This exercise is an altered version of the `errors3` exercise. It uses some
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// concepts that we won't get to until later in the course, like `Box` and the
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// `From` trait. It's not important to understand them in detail right now, but
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// you can read ahead if you like. For now, think of the `Box<dyn ???>` type as
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