The answer to your question about the second part of Jameson's response is the first part of Jameson's response--at compile time you can still modify the syntax tree of the program.
On Saturday, June 21, 2014 1:50:45 PM UTC-5, Andrew McKinlay wrote: > > What can I do at compile-time that I can't at run-time? > On Jun 21, 2014 2:49 PM, "Jameson Nash" <[email protected]> wrote: > >> A macro inserts the result back into the AST. and it is called at >> compile-time, not run-time. >> >> On Saturday, June 21, 2014, Andrew McKinlay <[email protected]> >> wrote: >> >>> What's the difference between writing macros versus functions that take >>> `Expr` objects? Is there anything you can't do with a function that takes >>> expression objects? Are there any advantages of using macros beyond no >>> having to quote the code you pass as an argument? >>> >>
