Collect export tag information
create_export_block(expr, ref, info, mod_ns)parse_object(info, expr, mod_ns)
roxygen2_object(alias, value, type)
create_export_block returns an object of type
roxy_block represents an exported declaration expression, along with
its source code location.
The unevaluated expression represented by the tag.
The code reference srcref represented by the tag.
The object name.
The object value.
The object type.