Plain Code Blocks in RMarkdown

[russHyde]

I have an issue when running lintr (v1.0.0 in vim or within R) on Rmarkdown files that contain plain code blocks (as defined here). Running lintr on the following (temp.Rmd) throws an "Error: Malformed file!", despite plain code blocks being legal in Rmarkdown and lintr working fine on any other Rmarkdown files that contain R code. If the block containing "This isn't evaluated" is removed, lintr runs fine; when it's present, the Malformed file error comes up.

---
title: "Plain Code Bug?"
output: pdf_document
---
```{r}
42
```

```
This isn't evaluated
```

[sebastiansauer]

Similar for me; I get the same error. I have some non-R fenced blocks in my rmd-file, eg.,

some text

(This code blocks are taken from bookdown)

[russHyde]

Disregard this issue; I now wrap plain-code-blocks in a "~~~~" block and the Malformed file bug doesn't come up in lintr (I couldn't pinpoint the problem within lintr or it's dependencies though)

~~~~
This isn't evaluated
~~~~

[randy3k]

I think we should keep this issue opened until it is probably addressed.

[russHyde]

Do you think this relates to the #322 bug whereby lintr parses non-R code blocks (eg, embedded bash / python) as if they were R code?

[randy3k]

It is a different bug. At least a python block doesn't throw Malformed file.

[russHyde]

I've submitted a PR to hopefully fix this.