Public Trait not Published

I work on Apache Arrow. There is a particular trait called RecordBatchReader that is public and I want to implement it for a type I have in another application but I can't use it when I use version 0.15.0 published to crates. When I look at the source that is pulled down the trait definition is stripped out of the published version.

Why is this, is it because the trait is not implemented by any other type in the arrow code base?

Arrow 0.15 does not contain that trait: https://docs.rs/crate/arrow/0.15.0/source/src/record_batch.rs

Sorry, I completely confused myself today. I had not realized that this file had been updated recently in this PR which made me question why I could not see it in 0.15.0.

Thanks @sfackler, sorry for the confusion.