How to show the error message in Knit html output?

Hello, I am writing codes in .Rmd file, and I want to see the output file in Knit html form. I have a wrong code and want to show it is wrong.

Error: unexpected input in "3 <- 3 & 5 !"

I want to show what it is in my output. How should I do?

Include this option for the chunk:

```{r error = TRUE}
3 <- 3 & 5 !

See here for more information:

(emphasis mine)

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