>According to the C interface documentation, assignments to tuple
>members must be done with the modify(value*,value) function.
>However, local variables once registered with the GC can apparently
>just be assigned.  If I do this instead will anything crash?
>
>        CAMLlocal1(nontuple);
>        modify(&nontuple,mydata);  // should just be nontuple=mydata;

Although it was not designed for this use, modify will work correctly
in this context.  I now guarantee that it won't crash if you use it in
this way.  It is a bit less efficient than direct assignment
(it does a little pointer arithmetic plus a memory read and a
conditional branch).

-- Damien
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