[Rd] as.Date with factor argument (PR#6779)

[hosking at watson.ibm.com]

Full_Name: J. R. M. Hosking
Version: 1.9.0
OS: WIndows 2000
Submission from: (NULL) (129.34.20.23)


> f<-factor("2000-01-02")
> as.Date(f)
Error in as.Date.default(f) : Don't know how to convert `x' to class "Date"

Presumably as.Date.factor(f) should have the same effect as
as.Date.character(as.character(f)), but that does not seem to be happening.