Allow sublists as lvalue in range notation

In my opinion it would be nice to allow for lvalue slicing using the range operator. Example: reverse the first n elements of a list

// throws IllegalArgumentException
list[0..<n] = list[0..<n].reverse()

The exception is thrown in DefaultGroovyMethods.java ("You must specify a list of 2 indexes to create a sub-list") for all n != 2 (i.e. almost always)

Rewriting the statement as

list[0, n-1] = list[0..<n].reverse()

works but is not as nice.

It might be enough to change DefaultGroovyMethods.java from

if (splice.size() != 2)

int left = InvokerHelper.asInt(splice.get(0));
int right = InvokerHelper.asInt(splice.get(1));

to

int left = InvokerHelper.asInt(splice.get(0));
int right = InvokerHelper.asInt(splice.get(splice.length()));

but i'm not sure what other parts are affected 'cause i'm a complete newbie

Thanks

Jochen