[Rd] gcinfo/R_alloc inconsistency

[Thomas Lumley]

gcinfo reports the amount of remaining heap using
	vcells = R_VSize - (R_VTop - R_VHeap);

but R_alloc tests
        if (R_VMax - R_VTop < size)
		mem_err_heap(size);


This means that you can get an out of memory error when gcinfo insists
there are vast amounts of memory left.


	-thomas

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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