[Rd] returned value of R_tryEval

[Romain Francois]

Hello,

At the moment, R-tryEval (src/main/context.c) :

SEXP R_tryEval(SEXP e, SEXP env, int *ErrorOccurred)

would set ErrorOccurred to 1 and return NULL when an error occurs during 
the evaluation of e within env, so to know that an error occured, we can 
just look at the ErrorOccured value and not look at the returned value.

Could this be expanded so that, when an error occurs, something more 
useful than NULL is returned, such as the call stack for example.

Romain

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Romain Francois
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