[frege-programming-language] Hello World won't say hello

[Russel Winder]

OK, I am now back into the Frege saddle with three weeks to go to the
JAX London workshop. However… I have the following Gradle script:

    plugins {
      id "org.frege-lang" version "0.8"
    }

    apply plugin: 'application'

    repositories {
      jcenter()
      mavenCentral()
    }

    dependencies {
      compile 'org.frege-lang:frege:3.24.+'
    }

    task wrapper(type: Wrapper) {
      gradleVersion = '3.1'
    }

    mainClassName = 'uk.org.russel.jaxlondon2016.HelloWorld'

    defaultTasks 'run'

and the filestore:

.
├── build.gradle
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── settings.gradle
└── src
    └── main
        └── frege
            └── uk
                └── org
                    └── russel
                        └── jaxlondon2016
                            └── HelloWorld.fr


with the Frege file being:

    {-|
    Module : uk.org.russel.jaxlondon2016.HelloWorld
    Description : The (in)famous 'Hello World' program in Haskell.
    Copyright : © 2016  Russel Winder
    License : GPLv3
    Maintainer :     rus...@winder.org.uk
Stability :  stable
Portability :  portable

This module contains an implementation of the 'Hello World' program first 
introduced to the world in
"The C Programming Language" by Brian Kernighan and Dennis Ritchie.

This is definitely Frege code and not Haskell code since we are using the Frege 
specific `println` function
(which is just `System.out.println` from the Java Platform) in preference to 
Haskell's `putStrLn`. `putStrLn`
would work equally well on Frege.
-}
module uk.org.russel.jaxlondon2016.HelloWorld where

-- | The Hello World program in Frege (Haskell)
main args = println "Hello World."


If I run this with Java 9 or with Java 8, I get:

    |> (usejdk8 && ./gradlew classes)
    :compileJava UP-TO-DATE
    :compileFrege
    Error: Could not find or load main class frege.compiler.Main
    :compileFrege FAILED

    FAILURE: Build failed with an exception.

    * What went wrong:
    Execution failed for task ':compileFrege'.
    > Process 'command '/usr/lib/jvm/java-8-openjdk-amd64/bin/java'' finished 
with non-zero exit value 1

    * Try:
    Run with --stacktrace option to get the stack trace. Run with --info or 
--debug option to get more log output.

    BUILD FAILED

    Total time: 1.139 secs

which is akin to a brick wall. Anyone any ideas?

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.win...@ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: rus...@winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder

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