Presently, type annotations and tree nodes are associated using the source position of the tree node.  For example, in the following type-annotated cast:

{code}
(@A List<@B Integer @C []>) foo
{code}

All three annotations must be given the source position of the *cast*, as opposed to the actual annotations.  This is misleading, and leads to errors when trying to edit code.

We should come up with a better way to update the bytecode offsets of type annotations.