patch 8.0.0486: crash and endless loop when closing windows in autocmd commit https://github.com/vim/vim/commit/8c752bd6c4af54c0b7bac35a39acc2bf16015f85 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 19 17:09:56 2017 +0100 patch 8.0.0486: crash and endless loop when closing windows in autocmd Problem: Crash and endless loop when closing windows in a SessionLoadPost autocommand. Solution: Check for valid tabpage. (partly neovim #6308)

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}\")