Checking LENGTH(allocVector(INTSXP,2)) [231477936] is 2 ... failed. Please forward this message to maintainer('data.table').

[rgpearce]

I have continued to get this loading error for the last couple of weeks while installing a package in R-devel. This has already been mentioned here and here, but it is not clear if this is a problem with data.table or r-devel.

[mattdowle]

Please include the output of sessionInfo() so we can see which version of R-devel you are using (its date and revision number) and which version of data.table (dev as of when, or which CRAN version).
I tried locally with dev data.table 1.10.5 and R-devel as follows and it passed ok :

R Under development (unstable) (2017-10-10 r73525)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 17.04

I updated to latest R-devel and it still seems fine

R Under development (unstable) (2017-11-08 r73690)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 17.04

Are you running a version of R-devel as of 2 weeks ago, perhaps? The comment in the linked issue seems to suggest there was a problem in R-devel which was resolved. So you have to update your version of R-devel.

Also, I uploaded latest dev 1.10.5 to win-builder and it passed latest R-devel there ok on Windows.

And, CRAN version 1.10.4-3 is passing fine on latest R-devel according to here.

The error you're seeing is the result of some checks that run on loading the package. For the LENGTH() of that vector not to be 2 is a very serious fundamental error and seems very likely to have been a fleeting bug in R-devel that was resolved quickly.

Please paste the output from sessionInfo().

[mattdowle]

Closing to move on. We must have sessionInfo() up front please as the Issue template asks for. Otherwise we waste time asking you for it and guessing.
If you still have the problem and you have latest R-devel, then please reopen.