The difference with lisps is that the debugger is always part of the runtime and you have full access to all the languages capabilities while inside. I've yet

The difference with lisps is that the debugger is always part of the runtime and you have full access to all the languages capabilities while inside. I've yet to see a C debugger which does more than a fancy version of printf. Imagine being able to compile functions on the go while still running your main program with all the state saved.