/**
* Provides all the duplicates in this scope (excluding the one from the passed selection).
*/
public List<Tuple<ITextSelection, SimpleNode>> getDuplicates(ITextSelection selection, exprType expression) {
FindDuplicatesVisitor v = VisitorFactory.createDuplicatesVisitor(selection, getASTNode(), expression, this,
this.getModule().getDoc());
return v.getDuplicates();
}