[lelf]

> when there's a problem in, say, a C compiler, all you can do is code around it, open an issue and wait for a fix in the next release.

Fix at as you'd (presumably) do in lisp. I don't see your point. (Yes, you have to recompile it, C is compiled language.)

> long-running web application that's affected by this bug, and don't want to restart it? Just run this in the REPL.

Yeah, if you it don't have long-running code, it isn't heavy threaded, that change doesn't alter any data structures, you don't care about possible downtime etc