Recursively calling the macros works fine if you `import` the whole
module wherever you are using your components, but not if you `require`
the module.
This is because importing brings in the all the macros into the callers
namespace, which allows them to be called just by the macro name. When
you `require` the module, it will look for the generated 2-arity macro
in the callers namespace, which probably doesn't exist.
We get around this by not recursively calling them and avoiding the
problem all togther. A few utility functions solves the original issue
of wanting to DRY the file.
