update old book references to the second edition of the book
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@@ -114,7 +114,8 @@ mod tests {
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// Minor hint: In each of the two cases in the match in main, you can create x with either a 'turbofish' or by hinting the type of x to the compiler. You may try both.
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// Minor hint: In each of the two cases in the match in main, you can create x with either
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// a 'turbofish' or by hinting the type of x to the compiler. You may try both.
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@@ -142,4 +143,5 @@ mod tests {
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// Major hint: Have a look at the Iter trait and at the explanation of its collect function. Especially the part about Result is interesting.
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// Major hint: Have a look at the Iter trait and at the explanation of its collect function.
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// Especially the part about Result is interesting.
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