To install an HTML version of this paper where Scheme and Scribble identifiers are hyperlinked to their documentation, first install PLT Scheme 4.1.5 or later from http://plt-scheme.org/. Then, start DrScheme, enter the program
and click Run. Running the program installs the paper and directs your default browser to the starting page. To view the document source, click Check Syntax and then right-click on mflatt/scribble-paper to open its source.
Acknowledgements: We would like to thank Matthias Felleisen and the anonymous reviewers for helpful feedback on this paper. This work is supported in part by the NSF.