The current R release candidate has a lack of protect bug (of very
long standing) with respect to the R_print.na_string and
R_print.na_string_noquote fields of the static R_print structure
declared in Print.h. This shows up very occassionally as incorrect
output from the following lines in reg-tests-2.R:
x <- c("a", NA, "b")
factor(x)
factor(x, exclude="")
The solution (kludgy, but the whole concept is kludgy) is to forward
R_print.na_string and R_print.na_string_noquote with the other "roots"
in RunGenCollect (after the comment /* forward all roots */).
Radford Neal
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