Github user viirya commented on the issue:
https://github.com/apache/spark/pull/20005
I've tried to investigate this and I think it is due to a wrongly formatted
document at https://cran.r-project.org/src/contrib/PACKAGES.in:
```
Package: alR
X-CRAN-Comment: Archived again on 2017-12-15 as none of the errors (failure
to install with clang and on Solaris, buffer overflows) were corrected.
X-CRAN-History: Archived on 2017-12-01 as C++ errors (and segfaults) were
not corrected despite reminders.
Unarchived on 2017-12-07.
```
There is an additional breaking line here and it breaks the function
`tools:::.check_package_CRAN_incoming`.
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