IDE with advanced code analysis?

/prog/, what's the IDE with the most advanced code analysis features out there? I'm talking about things like:

- listing all the free variables that occur in selected code term
- warning the user when he shadows a binding from the outer scope
- finding all the places where a variable gets mutated
- showing all possible execution paths through a code term

>>15
Code is meant to be read. Make it readable. That is the only thing that should guide function size.
Modules, not functions, are for abstraction boundaries and reusability.