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. If there is a character vector "source" attribute it should be used: that is the point of such attributes.
On Mon, 19 Nov 2007, karl at huftis.org wrote:
Full_Name: Karl Ove Hufthammer Version: 2.6.0 OS: Linux (Fedora 7) Submission from: (NULL) (129.177.61.84) When viewing a function that has its 'source' attribute set to a boolean or a numeric, R crashes with a segfault. (Setting 'source' to a character vector does not make R crash, however.) Steps to reproduce:
attr(lm,"source")=FALSE lm
*** caught segfault *** address 0x18, cause 'memory not mapped'
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Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595