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我正在编写一个学习者课程，我想为学生提供错误代码供他们修复或演示错误。例如：

---
title: "coding - intro"
output:
  learnr::tutorial:
    progressive: true
    allow_skip: true
runtime: shiny_prerendered
---

```{r setup, include=FALSE}
library(learnr)
```


```{r code_intro_data_type_error, exercise = FALSE, exercise.eval = FALSE}
weeks <- 4
days_in_week <- "7"

# we now attempt to multiple a number by a string
total_days <- weeks * days_in_week
```

理想情况下，我还想输出错误消息：

周错误 * days_in_week ：二进制运算符的非数字参数

但是由于代码在该块中有错误，它拒绝编译学习器脚本

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