patch 8.2.1092: not checking if saving for undo succeeds Commit: https://github.com/vim/vim/commit/cf070112ca2a6ac9ec5466be1cdc667f6abe8fd0 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jun 29 23:02:21 2020 +0200 patch 8.2.1092: not checking if saving for undo succeeds Problem: Not checking if saving for undo succeeds. Solution: Bail out if u_savesub() returns FAIL.

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}\")