Scala 2.12 support: trait compiles to an interface

[eed3si9n]

• http://www.scala-lang.org/blog/2016/07/08/trait-method-performance.html
• http://www.scala-lang.org/news/2.12.0-M5
• SD-98 don't emit unnecessary mixin forwarders scala/scala#5085 SD-98 don't emit unnecessary mixin forwarders

In most cases when a class inherits a concrete method from a trait we
don't need to generate a forwarder to the default method in the class.

This means we could skip the invalidation of classes extending traits in most cases.

notes

scala/scala#5085 (comment)

after this patch there are two situations where a trait forwarder is emitted:

1. a class inherits the same method from two traits, and the two traits are not in a inheritance relationship.
2. a class inherits a concrete method from a trait, and the same method also exists (abstract or concrete) in a superclass.

[dwijnand]

Isn't the forwarders situation the reason for the slowdown in scalac?

Perhaps we should wait for that to shake out before spending time on it in
zinc.

On Sat, 27 Aug 2016, 20:41 eugene yokota, notifications@github.com wrote:

http://www.scala-lang.org/blog/2016/07/08/trait-method-performance.html

• http://www.scala-lang.org/news/2.12.0-M5
• SD-98 don't emit unnecessary mixin forwarders scala/scala#5085 SD-98 don't emit unnecessary mixin forwarders scala/scala#5085 SD-98
  don't emit unnecessary mixin forwarders

In most cases when a class inherits a concrete method from a trait we
don't need to generate a forwarder to the default method in the class.

This means we could skip the invalidation of classes extending traits in
most cases.
notes

scala/scala#5085 (comment)
scala/scala#5085 (comment)

after this patch there are two situations where a trait forwarder is
emitted:

a class inherits the same method from two traits, and the two traits
are not in a inheritance relationship.
2.

a class inherits a concrete method from a trait, and the same method
also exists (abstract or concrete) in a superclass.

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