nested problems

let's say we have an string `i`, and we wanna iterator over it line by line
```nim
import std/strutils
let i = "..."
```

but this style of writing uses the funcion of `splitLines`
```nim
i.splitLines.iterrr:
map it.strip()
toseq()
```

but this style of writing uses the _**iterator**_ of `splitLines`
```nim
iterrr i.splitLines:
map it.strip()
toseq()
```

Start by searching the repository for the `iterrr` implementation and existing handling of `splitLines`, since the issue names no files or tests. Compare the two examples and clarify the intended behavior for function results versus iterator inputs, then add coverage showing the accepted syntax and its completed output.

Written by the indexing model from the issue text.