code: static JbcSrcJavaValue error(Expression expr, JbcSrcValueErrorReporter reporter) {
      return new JbcSrcJavaValue(
          expr,
          /* method= */ null,
          /* allowedType= */ null,
          /* constantNull= */ false,
          /* error= */ true,
          reporter);
    }
docs: Constructs a JbcSrcJavaValue that represents an error.