patch 8.2.3883: crash when switching to other regexp engine fails Commit: https://github.com/vim/vim/commit/5937c7505f444dd896f336fa0119a93a55ebe9a2 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 24 16:46:14 2021 +0000 patch 8.2.3883: crash when switching to other regexp engine fails Problem: Crash when switching to other regexp engine fails. Solution: Check for regprog being NULL.

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}\")