patch 8.2.3162: Vim9: argument types are not checked at compile time Commit: https://github.com/vim/vim/commit/1a71d31bf34b0b2b08517903826004ec6fd440e5 Author: Yegappan Lakshmanan <yegappan@yahoo.com> Date: Thu Jul 15 12:49:58 2021 +0200 patch 8.2.3162: Vim9: argument types are not checked at compile time Problem: Vim9: argument types are not checked at compile time. Solution: Add more type checks. (Yegappan Lakshmanan, closes https://github.com/vim/vim/issues/8560)

--- a/src/sign.c
+++ b/src/sign.c
@@ -2274,7 +2274,11 @@ f_sign_getdefined(typval_T *argvars, typ
 	return;
 
     if (argvars[0].v_type != VAR_UNKNOWN)
+    {
+	if (in_vim9script() && check_for_string_arg(argvars, 0) == FAIL)
+	    return;
 	name = tv_get_string(&argvars[0]);
+    }
 
     sign_getlist(name, rettv->vval.v_list);
 }