I tried to convert a sequential list to a parallel one in Intellij, but I get the error

> 
> Cannot resolve symbol par
> 
> 
> 

on the `.par` method call:

```
import scala.collection.parallel.immutable._
...
val parList = List(1,2,3).par

```

According to <https://docs.scala-lang.org/overviews/parallel-collections/overview.html>, one must simply

> 
> invoke the par method on the sequential collection, list. After that, one can use a parallel collection in the same way one would normally use a sequential collection.
> 
> 
> 

What makes me wonder is that I did not find any `par` method in the current immutable list api of scala: <https://www.scala-lang.org/api/current/scala/collection/immutable/List.html>

But there's even a dedicated scala doc-page for sequential to parallel conversion which uses the `par` method: <https://docs.scala-lang.org/overviews/parallel-collections/conversions.html>

**About my setup**

I'm on Arch Linux with OpenJDK 10 set at language level 9 (in Intellij) and scala-sdk-2.13.0.

Imported library dependencies:

* `scala-library` (2.13.0)
* `scala-parallel-collections` (2.13.0)