More refactorings that might be interesting to implement:

• Convert checked exception to Either
• Refactoring into pattern matching, e.g. from if-then-else 
• Convert between for and map/flatMap/filter
• How it works:
• Parser source
• https://gist.github.com/906503
• Convert a java file into its scala equivalent
• this is useful also for really simple Java files (that contain only a class definition and method declarations) since such classes are many times generated automatically by the RCP facilities
• Automatically add unimplemented methods when extending a trait

• Package structure does not match filesystem structure
• Shadowing of values, types, etc. 
• Not easily doable because the relevant information is only available in the presentation compiler
• Usage of the Application trait (it has been deprecated; no need for an additional warning)
• Usage of the any2string conversion
• Comparisons that will never succeed (e.g. Option[T] == T)