Sure, we all go through life via a form of trial and error, learning from our mistakes.

Personally, I think the fewer times you have to go around that wheel, the better.

I don't want to diminish the technical excellence of the achievements touted, and as a coder of primarily compiled languages, I would welcome any such improvements in the compilers I use.

However, my larger point stands-- which is that if a few seconds shaved on the run-debug loop is really a big deal for your total productivity, it means you're looping too much.

Trial and error is a fine way to learn a language, or to debug truly mysterious issues, such as those that exist outside of the abstraction layer you're working in. But in my opinion it's a poor way to work. It means that you don't understand the code you're writing.