commit https://github.com/vim/vim/commit/7e47d1ac6a9ae0e5a7167aa34ff651a9c39c1641 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 25 16:19:05 2015 +0200 patch 7.4.834 Problem: gettabvar() doesn't work after Vim start. (Szymon Wrozynski) Solution: Handle first window in tab still being NULL. (Christian Brabandt)

TYPEMAP
VIWIN	T_VIOBJNOMUNGE
VIBUF	T_VIOBJNOMUNGE

INPUT
T_VIOBJNOMUNGE
	if (sv_isa($arg, \"${ntype}\")) {
	    IV tmp = SvIV((SV*)SvRV($arg));
	    $var = INT2PTR($type, tmp);
	    if (!tmp)
		croak(\"$ntype no longer exists\");
	}
	else
	    croak(\"$var is not of type ${ntype}\")