patch 8.0.1257: no test for fix of undefined behavior commit https://github.com/vim/vim/commit/2973daafe1732963b8924cb9df53c608804d66b3 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 2 23:15:40 2017 +0100 patch 8.0.1257: no test for fix of undefined behavior Problem: No test for fix of undefined behavior. Solution: Add a test. (closes https://github.com/vim/vim/issues/2255)

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}\")