Use the [[ operator for extracting a single element from an object

[PMassicotte]

Think that could fit?

[PMassicotte]

It is usually safer to use [[ because of partial matching:

mtcars$mp
mtcars[["mp"]]
mtcars[["mpg"]]

[jalvesaq]

Yes, I see it as a good new feature because it changes the code to fix another error pointed out by lintr.