To all r2pipe.rs and radeco-lib users:
In accordance with the discussion here, the radare2 community has decided to move higher level API functions and structures to a newer repository by the name radare2-r2pipe-api (which will contain APIs for multiple languages). This enables them to keep the core r2pipe logic in tact and develop all abstractions seperately from it.
Both repositories have already been updated to be stable with the above changes.
If you are facing build issues, an ideal way to update your dependencies would be to:
$ cargo clean