At lines 1154-5 in par.c (at the latest svn revision 47460), in function do_par():
if (new_spec && GRecording(call, dd))
GErecordGraphicOperation(op, originalArgs, dd);
if the call GErecordGraphicOperation gives rise to a garbage collection
(as it may), the return value of do_par will be trashed.
(Discovered during CXXR development.)
Andrew
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