Macro clack_entry 

macro_rules! clack_entry {
    ($entry_type:ty, $entry_lambda:expr) => { ... };
    ($entry_type:ty) => { ... };
}

Produces an EntryDescriptor value from a given Entry type, but without exposing it.

This can be useful as an alternative to the usual clack_export_entry macro if you do not want or need to export the given entry, and just need an EntryDescriptor.