[Rd] (PR#10437) segfault on functions with 'source' attribute

[karl at huftis.org]

For the record: The reason I used attr(myfun, "source") = FALSE, is that I 
misread the example 'Tidying R Code' in 'Writing R Extensions', which calls 
for attr(myfun, "source") = NULL.

Somehow setting 'source' to FALSE seems more natural to me than 
setting it to NULL.

ripley at stats.ox.ac.uk:

> I am not sure why you would want to do that, but the C code does assume
> source attributes were put there by R, and changing tests from !isNull to
> isString in a few places will fix that.

-- 
Karl Ove Hufthammer