The well-known algorithm for macro expansion is mark-and-rename. Although the racket implementation was later changed to scope-sets(http://www.cs.utah.edu/plt/s

The well-known algorithm for macro expansion is mark-and-rename. Although the racket implementation was later changed to scope-sets(http://www.cs.utah.edu/plt/scope-sets/index.html http://www.cs.utah.edu/plt/scope-sets/index.html).