[perl #46691] [TODO] [C] Should the shift_pmc() method be silently ignored?

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# New Ticket Created by  Paul Cochrane 
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In src/pmc/exception.pmc:shift_pmc() there is the todo item:

    PMC *shift_pmc() {
        /* fprintf(stderr, "don't do that then\n"); XXX */
        return PMCNULL;
    }

Since the error is commented out, do we need this code (and its associated
todo item)?  Or, is there something wrong with silently ignoring this
method (as documented in the file)?