private DiagramItem Transform(ANTLRv4Parser.BlockContext context)
=> new Sequence(context.ruleAction()
.Select(x => x.GetText())
.Select(x => TerminalWithClass(x, "ruleActions"))
.Concat(new[] { Transform(context.altList()) })
.Select(FSharpChoice <DiagramItem, string> .NewChoice1Of2));
