code: @Nonnull
      public static SourceLineAnnotation createUnknown(@DottedClassName String className, String sourceFile, int startBytecode, int endBytecode) {
          SourceLineAnnotation result = new SourceLineAnnotation(className, sourceFile, -1, -1, startBytecode, endBytecode);
          // result.setDescription("SOURCE_LINE_UNKNOWN");
          return result;
      }
docs: Factory method to create an unknown source line annotation. This variant
  is used when bytecode offsets are known, but not source lines.
  
  @param className
  the class name
  @param sourceFile
  the source file name
  @return the SourceLineAnnotation