Groovy 2.0 with invokedynamic in Gradle

build.gradle

apply plugin: "groovy"

sourceCompatibility = 1.7
targetCompatibility = 1.7

compileGroovy {
  groovyOptions.metaClass.optionMap = { [indy: true, encoding: "UTF-8"] }
}

compileTestGroovy {
  groovyOptions.metaClass.optionMap = { [indy: true, encoding: "UTF-8"] }
}

repositories {
  mavenCentral()
}

configurations {
  all*.exclude module: "groovy-all"
}

dependencies {
  groovy "org.codehaus.groovy:groovy:2.0.+:indy"
  testCompile "org.spockframework:spock-core:0.7-groovy-2.0-SNAPSHOT"
}