Acknowledgments

Thanks to Matthias Felleisen, Robby Findler, Sam Tobin-Hochstadt, Jay McCarthy, Ryan Culpepper, Michael Adams, Michael Ballantyne, Tim Disney, Simon Peyton Jones, Shriram Krishnamurthi, and Eelco Visser for discussions about set-of-scopes binding. Joshua Grams provided helpful editing suggestions. Anthony Carrico and Chris Brooks helpfully pointed out some typos.