patch 8.1.0537: ui_breakcheck() may be called recursively commit https://github.com/vim/vim/commit/48d23bb4de3dd37ba0d0b22e7c39d6b894cb1f75 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Nov 20 02:42:43 2018 +0100 patch 8.1.0537: ui_breakcheck() may be called recursively Problem: ui_breakcheck() may be called recursively, which doesn't work. Solution: When called recursively, just return. (James McCoy, closes https://github.com/vim/vim/issues/3617)

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}\")