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此 Roxygen 问题也涉及此警告（来自运行R CMD check- 或在我的情况下devtools::check()），但我认为在我的情况下是其他原因导致此警告，因为Roxygen: list(wrap = TRUE)数据包的包说明文件中没有。

完整的警告是：

Found the following significant warnings:
  Warning: bad markup (extra space?) at railtrails.Rd:13:26
See ‘/private/var/folders/95/z6jql6w546vd0brdwm722s5r0000gn/T/RtmpJ7q9ou/railtrails.Rcheck/00install.out’ for details.

checking Rd files ... WARNING
prepare_Rd: bad markup (extra space?) at railtrails.Rd:13:26
```

Here is what seems to be the offending code:

```
#' Rail-trail trail data
#'
#' Information and reviews for rail-trails in the United States
#'
#' @source https://www.traillink.com/
#' @format Data frame with columns
#' \describe{
#' \item{name}{Name of rail trail}
#' \item{distance}{distance (miles)}
#' \item{surface}{surface material}
#' \item{category}{trail category}
#' \item{mean review rating}
#' \item{description}{text description of trail}
#' \item{n_reviews}{number of reviews}
#' \item{raw_reviews}{list column with a vector of reviews}
#' }
#' @importFrom tibble tibble
#' @examples
#' railtrails
#'
#' # to expand vector of review ratings in raw_reviews column:
#' library(tidyr)
#' railtrails <- railtrails %>% unnest(raw_reviews)

"railtrails"

感谢您的帮助。包在GitHub 上。

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