Oy. The mistake was actually in posting too late and not using the proper code tag. Don't drink and post, kids. ;) When I brought the code into vim I used the same indentation as the example, I saw that the indentation changed, but you're saying "The shape of the function is wrong."

It's quite possible my experience as a programmer today would be different than when I started -- I mean, I made it through a few chapters of SICP without such troubles, but in the back of my head was the memory of trying to figure out my logic error in a bit of code when it was really a misplaced paren.