commit https://github.com/vim/vim/commit/707659490d35e8d66e8bbdcfd93b12dc1387d86c Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 28 19:28:59 2016 +0100 patch 7.4.1451 Problem: Vim hangs when a channel has a callback but isn't referenced. Solution: Have channel_unref() only return TRUE when the channel was actually freed.

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}\")