[Rd] NAMESPACE file should be checked (PR#11765)

[dsuo at fas.harvard.edu]

Full_Name: Daniel Suo
Version: 2.7.0
OS: OS X
Submission from: (NULL) (128.12.16.145)


The NAMESPACE file should be checked for validity. For example, the following
entry will pass R CMD check:

dfgphofgohkpo(sdfpsodfk)

I'm not sure if the other files are checked rigorously, but this is the first
that I've noticed.

Thanks,
Daniel