It baffles me that a comp-sci textbook can be published (esp. in print) with incomplete or incorrect code examples. When copy+paste+compile+run is all that is required to check that the code is good, it's simply careless.
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Can be pretty hard to keep code examples in sync and checked without some sort of CI, especially if they depend on other things. If the book was put through some sort of desktop publishing system, then it's probably even easier for things to slip through... 😨