commit https://github.com/vim/vim/commit/46643713dc6bb04b4e84986b1763ef309e960161 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Sep 9 21:42:36 2016 +0200 patch 7.4.2357 Problem: Attempt to read history entry while not initialized. Solution: Skip when the index is negative.

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}\")