Lifetime of elements returned by Cursor::peek_next etc.

[neuronsguy]

Hi,

At the moment it seems that

Cursor::next()
Cursor::prev()
Cursor::peek_next()
Cursor::peek_prev()

all return Option<&mut T> where the reference has the lifetime of the Cursor instance, and not the underlying LinkedList.

I believe it should be safe in those methods to update the signatures to .. -> Option<&'a mut T>, and transmute the return value to have the appropriate lifetime. Does that sound correct?