[schemescape]

Yes, Smalltalk/Pharo also support this.

Being able to interactively update code in response to an error, without leaving the error context and being able to restart stack frames (not just a “catch” or top level, as in most languages) is one of the key features that makes REPL-driven development possible. Or at least that’s how I see it.

It’s not something you always need to use, but it can be handy, especially for prototyping and validating fixes.