scala.meta annotation not recognised Follow

Created February 11, 2017 09:58

Scala.meta seems to be partially working, in that it seems to understand the basic quasi quotes in my example main app. However the annotation definition below will not compile - I get the error:

Error:(20, 10) ';' expected but 'def' found.
     inline def apply(defn: Any): Any = meta {

I can't see anything significantly different between this and the example on the Scala.meta tutorial - this is a cutdown example for the posting here. IDEA even recognises that this is a 'meta program' and offers to compile it.

I'm using:

IDEA 2016.3.4 (build #UI-163.12024-16 - Jan31st)

Scala plugin (2016.3.8)

Scala 2.11.7

scalameta_2.11:1.4.0

jvm 1.8

Gradle 3.1 via IDEA

Have also tried EAP and Nightly builds

Any ideas how to get this working please?

dependencies {
    compile 'org.scala-lang:scala-library:2.11.7'
}

dependencies {
    compile group: 'org.scalameta', name: 'scalameta_2.11', version: '1.4.0'
}

My example program

package mymeta.test

import scala.annotation.StaticAnnotation
import scala.meta._


@mysync
class MySyncTest

object MetaTest extends App {
  val x = q"x + y"
  println(x)
}


class mysync extends StaticAnnotation {
  inline def apply(defn: Any): Any = meta {
    q"1 + 2"
  }
}

2 comments

Mikhail Mutcianko

Created May 04, 2017 14:53

Official comment

You are missing paradise plugin for Scala compiler, which is required to support the inline keyword.

Please try adding it with

dependencies {
  ...
  scalaCompilerPlugin "org.scalameta:paradise_2.11.7:3.0.0-M8"
}

Sanduleac Dan

Created August 01, 2017 10:58

Hi Mikhail,

There is no `scalaCompilerPlugin` configuration in gradle - the gradle scala plugin doesn't create one.

I have however managed to implement one, which results in the library being added to the scala SDK. But it assumes you're using nebula to recommend the scala version (or you'd have to write down the version yourself).

By writing the following code into a scala.gradle and then importing that into every project that needs scala:

apply plugin: 'scala'

// Figure out scala version using nebula.
// If you're not using nebula, you must figure it out from the ScalaCompile.getClasspath() just like ScalaBasePlugin does
ext.scalaVersion = rootProject.dependencyRecommendations.getRecommendedVersion(
        'org.scala-lang', 'scala-library') as String

configurations.create('scalaCompilerClasspath') {
    visible = false
}

dependencies {
    scalaCompilerClasspath "org.scala-lang:scala-compiler:${scalaVersion}".toString()
}

tasks.withType(ScalaCompile) {
    // Override the scala classpath inference done in ScalaBasePlugin.configureCompileDefaults
    scalaClasspath = configurations.scalaCompilerClasspath
}

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