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Comment by jdub | Hacker News Reader

Hmm. Can you...

  impl From<T> for GeoBox

... outside the module/crate in which GeoBox is defined (as suggested at the end)?

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Yes, as long as the implementation is in the same module/crate as the T.

It's only where both the left and right-hand side are in external crates that would be a problem.

Epic, thanks!

Yep, that is an advantage rust traits have over, say, java interfaces. (Though I hear java 8 is going to be able to do this as well)

Java 8 is out now and doesn't have this. I'm not aware of anything like this being on the cards for Java 9. Could you tell us more about what you heard?

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