New methods of debugging

I like to imagine this one guy responds to every incorrect post he sees with "Wrong" like this

How do you debug a compiled language though?

Here's another example for a place for improvement: visualization.

being able to visualize geometry and data structures would be very useful.
making it easy to do with the language will help a lot.

The compiler can leave debugging symbols in the binary. It bloats the file size a little, but it's generally negligible and the benefit of being able to debug on the user-end is worth it. In GCC or clang for example you have to pass the '-g' flag to the compiler.