R's native placeholder not recognised in chained `data.table` steps

[Fred-Wu]

Thanks for the new IDE. I normally use R's native placeholder _ in chained data.table steps. However, in the below step, symbols are not recognised.

[juliasilge]

The diagnostics problem here may be specific to how _ is used in data.table. This code, for example, has correct diagnostics:

mtcars |> lm(mpg ~ cyl, data = _)

[Fred-Wu]

Something like below also raises error using data.table, but was suggested by the code completion.

OR

[DavisVaughan]

Related to #5271

[testlabauto]

Duplicate of #### Verified Fixed Positron Version(s) : 2025.06.0-145 OS Version : OSX

Test scenario(s)

Can no longer repro with original filing code.

Link(s) to TestRail test cases run or created: