[Rd] Filename bug in png

[Richard Cotton]

In R2.7.1, the first line of the body of png() reads:
checkIntFormat(filename)

This should really be: 
if (!checkIntFormat(file)) 
        stop("invalid 'file'")

Otherwise a command such as png("foo%s.png") causes R to crash (see bug
#10571).

-----
Regards,
Richie.

Mathematical Sciences Unit
HSL
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