This patch recurses into any `create_function` block and processes any
`dispactch` blocks contained within. The implementation assumes docstrings will
be provided as a comment block, but this is just a temporary placeholder.
Idealy, the contents of the `dispatch` block would be processed to produce an
`@override` tag for 4.x functions.
All Future Parser functions are documented using a standard YARD comment block.
This commit adds a new code object that watches for `create_function` and
generates a YARD `CodeObject::MethodObject` containing the docstring.