Jon Pretty

I keep asking, without any good answer. Backward compatibility with bugs is such nonsense :(

AFAIK source incompatibility of non-experimental features would warrant an Epic increment.

.@viktorklang @tpolecat @adelbertchang it could be source comp if case class implied final, & actually extending them is forbiden since 2.8

.@viktorklang @tpolecat @adelbertchang yes, it's possible but extending case class should not be done if you expect pattern matching to work

I'm not sure I understand your point then. It can't be made final because it would be source incompatible.

is it still a source incompatibility if nobody use it and/or if only use cases are likelly bugs?

if code which compiled fine before does not compile fine after, then the source is incompatible.