One way would be to make the change in the source file and then recompile/reload that one function. This is pretty easy to do with SLIME; you can highlight the

One way would be to make the change in the source file and then recompile/reload that one function. This is pretty easy to do with SLIME; you can highlight the snippet of code you want to evaluate, and then send that to your program to be evaluated on-the-fly.