Improved development experience

[wader]

This issue is meant to collect ideas for an improved development and debug experience.

Some ideas:

• Option to enable some kind of stack trace on error
  • Function name if def or builtin
  • Filename, line and column
  • Possible to even show some lind of shorten binding/args?
• Improved errors
  • For builtins include function name
  • For error thrown by def/lambdas track name/location also somehow to be shown if not caught?

[nicowilliams]

A debugger would be nice too...

[nicowilliams]

Like in Python's pdb, we could have a breakpoint builtin that drops one into a debugger prompt where . and bindings could be examined. Being able to step in and so on would also be nice.