mod_interface 0.60.0

Protocol of modularity unifying interface of a module and introducing layers.
Documentation 
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error: Layer should not have explicitly defined visibility because all its subnamespaces are used.
         #[doc = " layer_a"] pub layer layer_a ;
 --> tests/meta/mod_interface/front/layer_bad_vis/mod.rs
  |
  | /   /// layer_a
  | |   pub layer layer_a;
  | |____________________^