patch 8.1.2149: crash when running out of memory very early Commit: https://github.com/vim/vim/commit/e3a22cb1ba057381be3e645479a537f8032f119f Author: Bram Moolenaar <Bram@vim.org> Date: Mon Oct 14 22:01:57 2019 +0200 patch 8.1.2149: crash when running out of memory very early Problem: Crash when running out of memory very early. Solution: Do not use IObuff when it's NULL. (closes https://github.com/vim/vim/issues/5052)

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}\")