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Reflection API exhibits a tension inherent to experimental things:
on the one hand we want it to grow into a beautiful and robust API,
but on the other hand we have to deal with immaturity of underlying mechanisms
by providing not very pretty solutions to enable important use cases.
In Scala 2.10, which was our first stab at reflection API, we didn't
have a systematic approach to dealing with this tension, sometimes exposing
too much of internals (e.g. Symbol.deSkolemize) and sometimes exposing
too little (e.g. there's still no facility to change owners, to do typing
transformations, etc). This resulted in certain confusion with some internal
APIs living among public ones, scaring the newcomers, and some internal APIs
only available via casting, which requires intimate knowledge of the
compiler and breaks compatibility guarantees.
This led to creation of the `internal` API module for the reflection API,
which provides advanced APIs necessary for macros that push boundaries
of the state of the art, clearly demarcating them from the more or less
straightforward rest and providing compatibility guarantees on par with
the rest of the reflection API.
This commit does break source compatibility with reflection API in 2.10,
but the next commit is going to introduce a strategy of dealing with that.
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Today’s flight back to Lausanne wasn’t as productive as the recent flight
to Minsk (https://github.com/scala/scala/pull/3305), but I noticed
one minor thingie: ExistentialTypeTree had an imprecise type specified
for its whereClauses. This is now fixed.
I didn’t increment PickleFormat.*Version numbers, because this change
introduces only a miniscule incompatibility with what would have been
a meaningless and most likely crash-inducing pickle anyway.
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Previously we believed that having Liftable outside of the Universe will
bring some advantages but it turned out this wasn’t worth it. Due to
infectious nature of path dependent types inside of the universe one
had to cast a lot. A nice example of what I’m talking about is a change
in trait ArbitraryTreesAndNames.
Additionally a number of standard Liftables is added for types that are
available through Predef and/or default scala._ import: Array, Vector,
List, Map, Set, Option, Either, TupleN.
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Our scalacheck tests now compile against 1.10.1 and 1.11.0.
They pass on 1.10.1, but fail on 1.11.0.
Once (that)[https://github.com/rickynils/scalacheck/issues/79]'s fixed,
and 1.11.1 released, we should be able to upgrade to it by simply
changing scalacheck.version.number in versions.properties.
The changes are mostly removing dead code (e.g., consolereporter business).
Of interest: the type ascription for `oneOf`. I haven't quite investigated,
but something seems to have changed between 1.10.1 and 1.11.0 that caused
a different overload to be picked without the type ascription.
Probably not a scalac bug, just a scalacheck api change.
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Now when there's no hope left for type macros, it's reasonable to provide
a more specific type for DefDef.name.
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Introduces an extensive ScalaCheck-based test suite for recently
implemented quasiquotes. Provides tools for syntactic tree comparison
and verifying compilation error messages.
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