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What changes or code evolution break backward compatibility (mainly binary compatibility)? Is it fully specified anywhere?
I checked the Scala language specification, but didn’t see any section on the matter like Java Language Specification Ch. 13 Binary Compatibility.
According to the mailing list, the spec documenting detailing backward compatibility issues does not yet exist but is in the works.
For current status and oulook of binary compatibility (mainly of the scala library), see Martin’s message to scala-user mailing list.
For a migration manager preview, see this page http://typesafe.com/technology/migration-manager.