M4/2.10 quasiquotes fail at runtime

[stanch]

Just to track this:

exception during macro expansion: 
[error] java.lang.ClassNotFoundException: scala.reflect.api.Universe$Liftable

[xeno-by]

Fixed in 46cd0f9, will soon be deployed in 2.0.0-M5.

[stanch]

Updated, now getting

exception during macro expansion: 
[error] java.lang.UnsupportedClassVersionError: scala/reflect/api/Universe$Liftable : Unsupported major.minor version 51.0

Maybe this is something on my side? The code is here: https://github.com/stanch/scalatags-md. Happens when you run sbt test.

[stanch]

It's fascinating how many facets fail can have! This one is caused by Java-compiled portions of quasiquotes.jar being compiled with Java 7 :)

Would it be possible for you to use Java 7 or 8? I'd prefer to cool down the pace of releases if that's not an absolute blocker for you. Alternatively I could publish a snapshot build with Java 6.

A snapshot would be very nice :) There is a benefit for you as well in that I would (or wouldn’t) confirm that there are no more hidden surprises left :)

[stanch]

Just FYI, http://scalamacros.org/news/2014/03/23/macro-paradise-2.0.0-M4.html does not display the layout for some reason...

[xeno-by]

Thanks, fixed the layout and published 2.0.0-SNAPSHOT against all supported branches.

[xeno-by]

If everything ends up working for you, I will publish 2.0.0-M6 one of these days.

[xeno-by]

Also, thanks a lot for testing things out!

[stanch]

You are welcome! But...

exception during macro expansion: 
[error] java.lang.NoSuchMethodError: scala.quasiquotes.StandardLiftables.Liftable()Lscala/quasiquotes/StandardLiftables$Liftable$;
[error]     at scala.quasiquotes.StandardLiftables$class.liftList(StandardLiftables.scala:54)
[...]

:D

[xeno-by]

That's a different error, which makes me kind of happy :)

How do I reproduce it?

[stanch]

You can clone https://github.com/stanch/scalatags-md and run sbt test. I’m on Java 6, as you already know. Old snapshots in Ivy cache cleaned.

[xeno-by]

Okay, thanks! These days I will be very occupied by EPFL stuff, but I'll do my best to take a look.

[stanch]

Thanks! I will not really need this until next week, when I’m going to prepare Macroid 2.0 documentation.
Perhaps the issue should be reopened?

[holograph]

Another reproduction scenario: https://github.com/wix/accord/tree/paradise-2.0.x

[xeno-by]

Minimal reproduction:

import scala.reflect.macros.Context
import scala.language.experimental.macros
import scala.quasiquotes.StandardLiftables

class Helper[C <: Context](val c: C) extends StandardLiftables {
  import c.universe._
  val u: c.universe.type = c.universe

  val tpe = typeOf[Int]
  def bar = q"2: $tpe"
}

object Macros {
  def impl(c: Context) = {
    val helper = new Helper[c.type](c)
    c.Expr[Int](helper.bar)
  }

  def foo: Int = macro impl
}

object Test extends App {
  Macros.foo
}

[xeno-by]

Allright nailed it: 7dfce72. Could you guys redownload the snapshot and try again?

[stanch]

Confirmed, thanks a lot!

[holograph]

M6 confirmed to work, thanks!