This is the final release of shapeless-2.2.4.
shapeless-2.2.4 is primarily a bugfix release, but includes two new
features (Split1
and WrappedOrphan
) to support type class derivation
for Cats. Expect to hear a lot more about this shortly …
These release notes provide a summary of changes since shapeless 2.2.3.
shapeless 2.2.4 is source and binary compatible with shapeless 2.2.0+
and should be binary compatible with shapeless-2.1.0 in most cases.
A Split1
type class has been added allowing complex nested type
constructors (ie. F[G[...]]
) to be decomposed (ie. as F[_]
,G[_]
) despite the limitations imposed by SI-2712.
An additional mechanism for managing the implicit priority of orphan
type class instances (WrappedOrphan
) has been added.
A number of bugs relating to Generic
instances for types with non-
trivial dependent prefixes or inaccessible constructors have been
fixed (#369, #417, #418,
#421 and #424).
The Witness
macro no longer attempts to produce singleton types for
instances of values types (#379).
An interaction between SI-5465 and Lazy
which caused
generation of Generic
instances of case-class-like types with an
unapply method has been fixed (#422)
shapeless master is now built with Scala 2.11.7.
Scala.js has been bumped to 0.6.4 and shapeless builds for Scala.js
and Scala 2.11.7 and 2.12.0-M1 are now being published.
Many thanks everyone who has contributed ideas, enthusiasm and
encouragement.