code: private void variantsFieldInit(MethodSpec.Builder method, String fieldName, Variants v) {
      Stmt b = new Stmt();
      b.append("$L = new $T(", fieldName, FIELD_VARIANTS);
      b.append("\n  ").append(v.abbreviated).comma();
      b.append("\n  ").append(v.narrow).comma();
      b.append("\n  ").append(v.short_).comma();
      b.append("\n  ").append(v.wide);
      b.append(")");
      method.addStatement(b.format(), b.args());
    }
docs: Appends a statement that initializes a FieldVariants field in the superclass.