When I type: sbt clean compile test in the vm/jvm directory I get an error with the sbt plugin
it looks like it is building from this file: https://github.com/mm-adt/vm/blob/master/jvm/build.sbt . I am considering eliminating asciidoctor as a kludge fix.

see: https://repo1.maven.org/maven2/org/asciidoctor/asciidoctorj/2.3.1/

[info] Loading global plugins from /home/ubuntu/.sbt/1.0/plugins
[info] Loading settings for project jvm-build from assembly.sbt,plugins.sbt ...
[info] Loading project definition from /home/ubuntu/Downloads/vm/jvm/project
[info] Loading settings for project jvm from build.sbt ...
[info] Set current project to jvm (in build file:/home/ubuntu/Downloads/vm/jvm/)
[info] Executing in batch mode. For better performance use sbt's shell
[success] Total time: 0 s, completed Jul 17, 2020, 2:30:40 PM
Copying resources to data.
[warn]
[warn] Note: Unresolved dependencies path:
[error] sbt.librarymanagement.ResolveException: Error downloading org.asciidoctor:asciidoctorj-diagram:2.3.1
[error] Not found
[error] Not found
[error] not found: /home/ubuntu/.ivy2/local/org.asciidoctor/asciidoctorj-diagram/2.3.1/ivys/ivy.xml
[error] not found: https://repo1.maven.org/maven2/org/asciidoctor/asciidoctorj-diagram/2.3.1/asciidoctorj-diagram-2.3.1.pom
[error] Error downloading org.asciidoctor:asciidoctorj:2.3.1
[error] Not found
[error] Not found
[error] not found: /home/ubuntu/.ivy2/local/org.asciidoctor/asciidoctorj/2.3.1/ivys/ivy.xml
[error] not found: https://repo1.maven.org/maven2/org/asciidoctor/asciidoctorj/2.3.1/asciidoctorj-2.3.1.pom
[error] at lmcoursier.CoursierDependencyResolution.unresolvedWarningOrThrow(CoursierDependencyResolution.scala:246)
[error] at lmcoursier.CoursierDependencyResolution.$anonfun$update$34(CoursierDependencyResolution.scala:215)
[error] at scala.util.Either$LeftProjection.map(Either.scala:573)
[error] at lmcoursier.CoursierDependencyResolution.update(CoursierDependencyResolution.scala:215)
[error] at sbt.librarymanagement.DependencyResolution.update(DependencyResolution.scala:60)
[error] at sbt.internal.LibraryManagement$.resolve$1(LibraryManagement.scala:52)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$12(LibraryManagement.scala:102)
[error] at sbt.util.Tracked$.$anonfun$lastOutput$1(Tracked.scala:69)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$20(LibraryManagement.scala:115)
[error] at scala.util.control.Exception$Catch.apply(Exception.scala:228)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$11(LibraryManagement.scala:115)
[error] at sbt.internal.LibraryManagement$.$anonfun$cachedUpdate$11$adapted(LibraryManagement.scala:96)
[error] at sbt.util.Tracked$.$anonfun$inputChanged$1(Tracked.scala:150)
[error] at sbt.internal.LibraryManagement$.cachedUpdate(LibraryManagement.scala:129)
[error] at sbt.Classpaths$.$anonfun$updateTask0$5(Defaults.scala:2947)
[error] at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:62)
[error] at sbt.std.Transform$$anon$4.work(Transform.scala:67)
[error] at sbt.Execute.$anonfun$submit$2(Execute.scala:281)
[error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error] at sbt.Execute.work(Execute.scala:290)
[error] at sbt.Execute.$anonfun$submit$1(Execute.scala:281)
[error] at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:178)
[error] at sbt.CompletionService$$anon$2.call(CompletionService.scala:37)
[error] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error] at java.base/java.lang.Thread.run(Thread.java:834)
[error] (machine / update) sbt.librarymanagement.ResolveException: Error downloading org.asciidoctor:asciidoctorj-diagram:2.3.1
[error] Not found
[error] Not found
[error] not found: /home/ubuntu/.ivy2/local/org.asciidoctor/asciidoctorj-diagram/2.3.1/ivys/ivy.xml
[error] not found: https://repo1.maven.org/maven2/org/asciidoctor/asciidoctorj-diagram/2.3.1/asciidoctorj-diagram-2.3.1.pom
[error] Error downloading org.asciidoctor:asciidoctorj:2.3.1
[error] Not found
[error] Not found
[error] not found: /home/ubuntu/.ivy2/local/org.asciidoctor/asciidoctorj/2.3.1/ivys/ivy.xml
[error] not found: https://repo1.maven.org/maven2/org/asciidoctor/asciidoctorj/2.3.1/asciidoctorj-2.3.1.pom
[error] Total time: 1 s, completed Jul 17, 2020, 2:30:41 PM

" ".repeat creates problems in java 1.80_241, scala 2.11.2, sbt 1.3.7

/*
 * Copyright (c) 2019-2029 RReduX,Inc. [http://rredux.com]
 *
 * This file is part of mm-ADT.
 *
 *  mm-ADT is free software: you can redistribute it and/or modify it under
 *  the terms of the GNU Affero General Public License as published by the
 *  Free Software Foundation, either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  mm-ADT is distributed in the hope that it will be useful, but WITHOUT ANY
 *  WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
 *  License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with mm-ADT. If not, see <https://www.gnu.org/licenses/>.
 *
 *  You can be released from the requirements of the license by purchasing a
 *  commercial license from RReduX,Inc. at [[email protected]].
 */

package org.mmadt.language.obj.op.traverser

import org.mmadt.language.Tokens
import org.mmadt.language.obj.`type`.{StrType, Type}
import org.mmadt.language.obj.op.TraverserInstruction
import org.mmadt.language.obj.value.StrValue
import org.mmadt.language.obj.{Inst, Obj, Str}
import org.mmadt.processor.Traverser
import org.mmadt.storage.StorageFactory._
import org.mmadt.storage.obj.value.VInst

import scala.collection.mutable

/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
trait ExplainOp {
  this:Type[Obj] =>

  def explain():StrType = vstr(name = Tokens.str,value = ExplainOp.printableTable(asType(this)),q = qOne).start()
}

object ExplainOp {
  def apply():Inst[Obj,Str] = new ExplainInst

  class ExplainInst extends VInst[Obj,Str]((Tokens.explain,Nil))  {
    override def apply(trav:Traverser[Obj]):Traverser[Str] ={
      trav.split(trav.obj().asInstanceOf[Type[Obj]].explain())
    }
  }

  private type Row = (Int,Inst[Obj,Obj],Type[Obj],Type[Obj],mutable.LinkedHashMap[String,Obj])

  private def explain(atype:Type[Obj],state:mutable.LinkedHashMap[String,Obj],depth:Int = 0):List[Row] ={
    val report = atype.insts.foldLeft(List[Row]())((a,b) => {
      if (b._2.isInstanceOf[TraverserInstruction]) state += (b._2.arg0[StrValue]().value -> b._2.apply(Traverser.standard(b._1)).obj().asInstanceOf[Type[Obj]].range)
      val temp  = if (b._2.isInstanceOf[TraverserInstruction]) a else a :+ (depth,b._2,lastRange(b._1),b._2.apply(Traverser.standard(b._1)).obj().asInstanceOf[Type[Obj]].range,mutable.LinkedHashMap(state.toSeq:_*))
      val inner = b._2.args().foldLeft(List[Row]())((x,y) => x ++ (y match {
        case btype:Type[Obj] => explain(btype,mutable.LinkedHashMap(state.toSeq:_*),depth + 1)
        case _ => Nil
      }))
      temp ++ inner
    })
    report
  }

  private def lastRange(atype:Type[Obj]):Type[Obj] = if (atype.insts.isEmpty) atype else atype.linvert().range

  def printableTable(atype:Type[Obj]):String ={
    val report                = explain(atype,mutable.LinkedHashMap.empty[String,Obj])
    val c1                    = report.map(x => x._2.toString.length).max + 4
    val c2                    = report.map(x => x._3.toString.length).max + 4
    val c3                    = report.map(x => x._4.toString.length).max + 4
    val builder:StringBuilder = new StringBuilder()
    builder
     //  .append("instruction").append(" ".repeat(Math.abs(11 - c1)))
      // removed because it does not work
      //      .append("domain").append(" ".repeat(Math.abs(6 - c2)))
      // .append(" ".repeat(5))
      // .append("range").append(" ".repeat(Math.abs(6 - c3)))
      .append("state").append("\n")
     //  builder.append("-".repeat(builder.length)).append("\n")
    report.foldLeft(builder)((a,b) => a
      //  .append(" ".repeat(b._1))
     //  .append(b._2).append(" ".repeat(Math.abs(c1 - (b._2.toString.length))))
     // .append(b._3).append(" ".repeat(Math.abs(c2 - (b._3.toString.length) - (b._1))))
     // .append("=>").append(" ".repeat(3)).append(" ".repeat(b._1))
     // .append(b._4).append(" ".repeat(Math.abs(c3 - (b._4.toString.length) - (b._1))))
      .append(b._5.foldLeft("")((x,y) => x + (y._2 + "<" + y._1 + "> "))).append("\n"))
    "\n" + atype.toString + "\n\n" + builder.toString()
  }
}

I have been following mm-adt's development, I think this is a game changer and I'm interested it trying to integrate an mm-adt VM into a go(lang) project.

I know mm-adt is still under heavy development, but do you think this repo is stable enough to port to go? If yes I'd be interested in attempting this.