Okay, I found rainbow.arc. (I was doing find from the wrong place). And am following the README, but still no joy.
% setenv ARC_PATH ~/tmp/arc:./src/arc
% java -jar build/dist/rainbow/rainbow.jar
Exception in thread "main" rainbow.ArcError: call* table not found in environment: if you are not using anarki please specify --strict-arc on the command-line
at rainbow.vm.continuations.FunctionDispatcher.anarkiCompatibleTypeDispatch(FunctionDispatcher.java:68)
at rainbow.vm.continuations.FunctionDispatcher.digestFunction(FunctionDispatcher.java:52)
at rainbow.vm.continuations.FunctionDispatcher.onReceive(FunctionDispatcher.java:38)
at rainbow.vm.continuations.ContinuationSupport.receive(ContinuationSupport.java:28)
at rainbow.vm.Interpreter.interpret(Interpreter.java:30)
at rainbow.vm.continuations.FunctionDispatcher.process(FunctionDispatcher.java:33)
at rainbow.vm.ArcThread.run(ArcThread.java:28)
at rainbow.Console.compileAndEval(Console.java:149)
at rainbow.Console.load(Console.java:140)
at rainbow.Console.loadFile(Console.java:133)
at rainbow.Console.main(Console.java:39)
If you are using anarki and still getting this error, then it's a mystery. It might be necessary to expand "~/tmp/arc" into a full path - I know rainbow doesn't expand "~", and I don't know if the shell does. And "~/tmp/arc" should contain arc.arc and the usual arc files from the distribution.
