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There is a new edition of the book and this is an old link.
Comments must start with two slashes and continue until the end of the line. For comments that extend beyond a single line, you’ll need to include // on each line.
// So we’re doing something complicated here, long enough that we need
// multiple lines of comments to do it! Whew! Hopefully, this comment will
// explain what’s going on.Here are the relevant sections in the new and old books: