[Rd] R crashes for large formulas in lm() (PR#8180)

[hallgeir.grinde@elkem.no]

Full_Name: Hallgeir Grinde
Version: 2.1.1
OS: Windows XP
Submission from: (NULL) (144.127.1.1)


While using lm(y~(x*z*c*...*v)^2) R crashes/closes if the numbers of variables
are at least 8.