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There is a newer version: 9.4.9.0

package org.jruby.ir;

public class CodeVersion {
    private static long _nextVersionNumber = 0L;

    // SSS FIXME: Does int suffice, or do we need long?
    public final long _version;

    public static CodeVersion getClassVersionToken()  {
        return new ClassCodeVersion();
    }

    public static CodeVersion getMethodVersionToken() {
        return new MethodCodeVersion();
    }

    protected CodeVersion(long v) { _version = v; }

    static class ClassCodeVersion extends CodeVersion {
        ClassCodeVersion() { super(_nextVersionNumber+1); _nextVersionNumber++; }
        public String toString() { return "C_" + super.toString(); }
        private static long _nextVersionNumber = 0L;
    }

    static class MethodCodeVersion extends CodeVersion {
        MethodCodeVersion() { super(_nextVersionNumber+1); _nextVersionNumber++; }
        public String toString() { return "M_" + super.toString(); }
        private static long _nextVersionNumber = 0L;
    }
}