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I had a lot of trouble understanding this. Thus I am documenting it here for myself. All credit goes to the original StackOverFlow author.

1. Add one of the following to the root of your crate. Usually lib.rs
   1.

   #![feature(doc_cfg)]
   

   This is less than ideal as it will cause compile errors when used with stable
   2. It is better to use:

   #![cfg_attr(docsrs, feature(doc_cfg))]
   

   This allows this to be conditionally compiled and does not give any errors.

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