diff --git a/src/evalfunc.c b/src/evalfunc.c
index 8cd137a..02943c7 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -2679,6 +2679,7 @@
     int		use_string = FALSE;
     partial_T   *arg_pt = NULL;
     char_u	*trans_name = NULL;
+    int		is_global = FALSE;
 
     if (argvars[0].v_type == VAR_FUNC)
     {
@@ -2702,21 +2703,10 @@
     if ((use_string && vim_strchr(s, AUTOLOAD_CHAR) == NULL) || is_funcref)
     {
 	name = s;
-	trans_name = trans_function_name(&name, FALSE,
+	trans_name = trans_function_name(&name, &is_global, FALSE,
 	     TFN_INT | TFN_QUIET | TFN_NO_AUTOLOAD | TFN_NO_DEREF, NULL, NULL);
 	if (*name != NUL)
 	    s = NULL;
-	else if (trans_name != NULL
-		&& ASCII_ISUPPER(*s)
-		&& current_sctx.sc_version == SCRIPT_VERSION_VIM9
-		&& find_func(trans_name, NULL) == NULL)
-	{
-	    // With Vim9 script "MyFunc" can be script-local to the current
-	    // script or global.  The script-local name is not found, assume
-	    // global.
-	    vim_free(trans_name);
-	    trans_name = vim_strsave(s);
-	}
     }
 
     if (s == NULL || *s == NUL || (use_string && VIM_ISDIGIT(*s))
@@ -2724,8 +2714,8 @@
 	semsg(_(e_invarg2), use_string ? tv_get_string(&argvars[0]) : s);
     // Don't check an autoload name for existence here.
     else if (trans_name != NULL && (is_funcref
-				? find_func(trans_name, NULL) == NULL
-				: !translated_function_exists(trans_name)))
+			 ? find_func(trans_name, is_global, NULL) == NULL
+			 : !translated_function_exists(trans_name, is_global)))
 	semsg(_("E700: Unknown function: %s"), s);
     else
     {
@@ -2862,7 +2852,7 @@
 		}
 		else if (is_funcref)
 		{
-		    pt->pt_func = find_func(trans_name, NULL);
+		    pt->pt_func = find_func(trans_name, is_global, NULL);
 		    func_ptr_ref(pt->pt_func);
 		    vim_free(name);
 		}
diff --git a/src/proto/userfunc.pro b/src/proto/userfunc.pro
index 19097fe..81d6938 100644
--- a/src/proto/userfunc.pro
+++ b/src/proto/userfunc.pro
@@ -7,11 +7,12 @@
 void emsg_funcname(char *ermsg, char_u *name);
 int get_func_tv(char_u *name, int len, typval_T *rettv, char_u **arg, funcexe_T *funcexe);
 char_u *fname_trans_sid(char_u *name, char_u *fname_buf, char_u **tofree, int *error);
-ufunc_T *find_func(char_u *name, cctx_T *cctx);
+ufunc_T *find_func(char_u *name, int is_global, cctx_T *cctx);
 int call_user_func_check(ufunc_T *fp, int argcount, typval_T *argvars, typval_T *rettv, funcexe_T *funcexe, dict_T *selfdict);
 void save_funccal(funccal_entry_T *entry);
 void restore_funccal(void);
 funccall_T *get_current_funccal(void);
+void delete_script_functions(int sid);
 void free_all_functions(void);
 int builtin_function(char_u *name, int len);
 int func_call(char_u *name, typval_T *args, partial_T *partial, dict_T *selfdict, typval_T *rettv);
@@ -19,11 +20,11 @@
 int call_callback(callback_T *callback, int len, typval_T *rettv, int argcount, typval_T *argvars);
 void user_func_error(int error, char_u *name);
 int call_func(char_u *funcname, int len, typval_T *rettv, int argcount_in, typval_T *argvars_in, funcexe_T *funcexe);
-char_u *trans_function_name(char_u **pp, int skip, int flags, funcdict_T *fdp, partial_T **partial);
+char_u *trans_function_name(char_u **pp, int *is_global, int skip, int flags, funcdict_T *fdp, partial_T **partial);
 char_u *untrans_function_name(char_u *name);
 void ex_function(exarg_T *eap);
 int eval_fname_script(char_u *p);
-int translated_function_exists(char_u *name);
+int translated_function_exists(char_u *name, int is_global);
 int has_varargs(ufunc_T *ufunc);
 int function_exists(char_u *name, int no_deref);
 char_u *get_expanded_name(char_u *name, int check);
diff --git a/src/scriptfile.c b/src/scriptfile.c
index 3b7652d..0756116 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -1275,6 +1275,7 @@
 	hashitem_T	*hi;
 	dictitem_T	*di;
 	int		todo;
+	int		is_vim9 = si->sn_version == SCRIPT_VERSION_VIM9;
 
 	// loading the same script again
 	si->sn_had_command = FALSE;
@@ -1293,6 +1294,10 @@
 
 	// old imports are no longer valid
 	free_imports(sid);
+
+	// in Vim9 script functions are marked deleted
+	if (is_vim9)
+	    delete_script_functions(sid);
     }
     else
     {
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 42a9926..4632272 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -207,12 +207,12 @@
   assert_equal(true, g:adict == #{bbb: 8, aaa: 2})
   assert_equal(false, #{ccc: 9, aaa: 2} == g:adict)
 
-  assert_equal(true, function('Test_expr4_equal') == function('Test_expr4_equal'))
-  assert_equal(false, function('Test_expr4_equal') == function('Test_expr4_is'))
+  assert_equal(true, function('g:Test_expr4_equal') == function('g:Test_expr4_equal'))
+  assert_equal(false, function('g:Test_expr4_equal') == function('g:Test_expr4_is'))
 
-  assert_equal(true, function('Test_expr4_equal', [123]) == function('Test_expr4_equal', [123]))
-  assert_equal(false, function('Test_expr4_equal', [123]) == function('Test_expr4_is', [123]))
-  assert_equal(false, function('Test_expr4_equal', [123]) == function('Test_expr4_equal', [999]))
+  assert_equal(true, function('g:Test_expr4_equal', [123]) == function('g:Test_expr4_equal', [123]))
+  assert_equal(false, function('g:Test_expr4_equal', [123]) == function('g:Test_expr4_is', [123]))
+  assert_equal(false, function('g:Test_expr4_equal', [123]) == function('g:Test_expr4_equal', [999]))
 enddef
 
 " test != comperator
@@ -274,12 +274,12 @@
   assert_equal(false, g:adict != #{bbb: 8, aaa: 2})
   assert_equal(true, #{ccc: 9, aaa: 2} != g:adict)
 
-  assert_equal(false, function('Test_expr4_equal') != function('Test_expr4_equal'))
-  assert_equal(true, function('Test_expr4_equal') != function('Test_expr4_is'))
+  assert_equal(false, function('g:Test_expr4_equal') != function('g:Test_expr4_equal'))
+  assert_equal(true, function('g:Test_expr4_equal') != function('g:Test_expr4_is'))
 
-  assert_equal(false, function('Test_expr4_equal', [123]) != function('Test_expr4_equal', [123]))
-  assert_equal(true, function('Test_expr4_equal', [123]) != function('Test_expr4_is', [123]))
-  assert_equal(true, function('Test_expr4_equal', [123]) != function('Test_expr4_equal', [999]))
+  assert_equal(false, function('g:Test_expr4_equal', [123]) != function('g:Test_expr4_equal', [123]))
+  assert_equal(true, function('g:Test_expr4_equal', [123]) != function('g:Test_expr4_is', [123]))
+  assert_equal(true, function('g:Test_expr4_equal', [123]) != function('g:Test_expr4_equal', [999]))
 enddef
 
 " test > comperator
@@ -929,15 +929,15 @@
 
 def Test_expr7_trailing()
   " user function call
-  assert_equal(123, CallMe(123))
-  assert_equal(123, CallMe(  123))
-  assert_equal(123, CallMe(123  ))
-  assert_equal('yesno', CallMe2('yes', 'no'))
-  assert_equal('yesno', CallMe2( 'yes', 'no' ))
-  assert_equal('nothing', CallMe('nothing'))
+  assert_equal(123, g:CallMe(123))
+  assert_equal(123, g:CallMe(  123))
+  assert_equal(123, g:CallMe(123  ))
+  assert_equal('yesno', g:CallMe2('yes', 'no'))
+  assert_equal('yesno', g:CallMe2( 'yes', 'no' ))
+  assert_equal('nothing', g:CallMe('nothing'))
 
   " partial call
-  let Part = function('CallMe')
+  let Part = function('g:CallMe')
   assert_equal('yes', Part('yes'))
 
   " funcref call, using list index
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index f3721ba..2ee91f1 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -353,7 +353,7 @@
 def Test_delfunc()
   let lines =<< trim END
     vim9script
-    def GoneSoon()
+    def g:GoneSoon()
       echo 'hello'
     enddef
 
@@ -361,7 +361,7 @@
       GoneSoon()
     enddef
 
-    delfunc GoneSoon
+    delfunc g:GoneSoon
     CallGoneSoon()
   END
   writefile(lines, 'XToDelFunc')
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index 218ef77..0ab170e 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -53,7 +53,7 @@
   endif
   let Funky1: func
   let Funky2: func = function('len')
-  let Party2: func = funcref('Test_syntax')
+  let Party2: func = funcref('g:Test_syntax')
 
   # type becomes list<any>
   let somelist = rand() > 0 ? [1, 2, 3] : ['a', 'b', 'c']
@@ -282,6 +282,49 @@
   assert_equal('', $ENVVAR)
 enddef
 
+def Test_delfunction()
+  " Check function is defined in script namespace
+  CheckScriptSuccess([
+      'vim9script',
+      'func CheckMe()',
+      '  return 123',
+      'endfunc',
+      'assert_equal(123, s:CheckMe())',
+      ])
+
+  " Check function in script namespace cannot be deleted
+  CheckScriptFailure([
+      'vim9script',
+      'func DeleteMe1()',
+      'endfunc',
+      'delfunction DeleteMe1',
+      ], 'E1084:')
+  CheckScriptFailure([
+      'vim9script',
+      'func DeleteMe2()',
+      'endfunc',
+      'def DoThat()',
+      '  delfunction DeleteMe2',
+      'enddef',
+      'DoThat()',
+      ], 'E1084:')
+  CheckScriptFailure([
+      'vim9script',
+      'def DeleteMe3()',
+      'enddef',
+      'delfunction DeleteMe3',
+      ], 'E1084:')
+  CheckScriptFailure([
+      'vim9script',
+      'def DeleteMe4()',
+      'enddef',
+      'def DoThat()',
+      '  delfunction DeleteMe4',
+      'enddef',
+      'DoThat()',
+      ], 'E1084:')
+enddef
+
 func Test_wrong_type()
   call CheckDefFailure(['let var: list<nothing>'], 'E1010:')
   call CheckDefFailure(['let var: list<list<nothing>>'], 'E1010:')
@@ -649,7 +692,7 @@
   assert_fails('export something', 'E1043')
 enddef
 
-def Test_vim9script_reload()
+def Test_vim9script_reload_import()
   let lines =<< trim END
     vim9script
     const var = ''
@@ -700,6 +743,47 @@
   delete('Ximport.vim')
 enddef
 
+def Test_vim9script_reload_delfunc()
+  let first_lines =<< trim END
+    vim9script
+    def FuncYes(): string
+      return 'yes'
+    enddef
+  END
+  let middle_lines =<< trim END
+    def FuncNo(): string
+      return 'no'
+    enddef
+  END
+  let final_lines =<< trim END
+    def g:DoCheck(no_exists: bool)
+      assert_equal('yes', FuncYes())
+      if no_exists
+        assert_equal('no', FuncNo())
+      else
+        assert_fails('call FuncNo()', 'E117:')
+      endif
+    enddef
+  END
+
+  # FuncNo() is defined
+  writefile(first_lines + middle_lines + final_lines, 'Xreloaded.vim')
+  source Xreloaded.vim
+  g:DoCheck(true)
+
+  # FuncNo() is not redefined
+  writefile(first_lines + final_lines, 'Xreloaded.vim')
+  source Xreloaded.vim
+  g:DoCheck(false)
+
+  # FuncNo() is back
+  writefile(first_lines + middle_lines + final_lines, 'Xreloaded.vim')
+  source Xreloaded.vim
+  g:DoCheck(true)
+
+  delete('Xreloaded.vim')
+enddef
+
 def Test_import_absolute()
   let import_lines = [
         'vim9script',
@@ -1445,15 +1529,15 @@
 
   CheckScriptSuccess([
       'vim9script',
-      'func DeleteMe()',
+      'func g:DeleteMeA()',
       'endfunc',
-      'delfunction DeleteMe # comment',
+      'delfunction g:DeleteMeA # comment',
       ])
   CheckScriptFailure([
       'vim9script',
-      'func DeleteMe()',
+      'func g:DeleteMeB()',
       'endfunc',
-      'delfunction DeleteMe# comment',
+      'delfunction g:DeleteMeB# comment',
       ], 'E488:')
 
   CheckScriptSuccess([
diff --git a/src/testing.c b/src/testing.c
index 35c2683..604d39b 100644
--- a/src/testing.c
+++ b/src/testing.c
@@ -789,7 +789,7 @@
 	    {
 		ufunc_T *fp;
 
-		fp = find_func(argvars[0].vval.v_string, NULL);
+		fp = find_func(argvars[0].vval.v_string, FALSE, NULL);
 		if (fp != NULL)
 		    retval = fp->uf_refcount;
 	    }
diff --git a/src/userfunc.c b/src/userfunc.c
index 6005af1..993697e 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -25,6 +25,7 @@
 #define FC_DEAD	    0x80	// function kept only for reference to dfunc
 #define FC_EXPORT   0x100	// "export def Func()"
 #define FC_NOARGS   0x200	// no a: variables in lambda
+#define FC_VIM9	    0x400	// defined in vim9 script file
 
 /*
  * All user-defined functions are found in this hashtable.
@@ -710,16 +711,17 @@
 
 /*
  * Find a function by name, return pointer to it in ufuncs.
+ * When "is_global" is true don't find script-local or imported functions.
  * Return NULL for unknown function.
  */
     static ufunc_T *
-find_func_even_dead(char_u *name, cctx_T *cctx)
+find_func_even_dead(char_u *name, int is_global, cctx_T *cctx)
 {
     hashitem_T	*hi;
     ufunc_T	*func;
     imported_T	*imported;
 
-    if (in_vim9script())
+    if (in_vim9script() && !is_global)
     {
 	// Find script-local function before global one.
 	func = find_func_with_sid(name, current_sctx.sc_sid);
@@ -750,9 +752,9 @@
  * Return NULL for unknown or dead function.
  */
     ufunc_T *
-find_func(char_u *name, cctx_T *cctx)
+find_func(char_u *name, int is_global, cctx_T *cctx)
 {
-    ufunc_T	*fp = find_func_even_dead(name, cctx);
+    ufunc_T	*fp = find_func_even_dead(name, is_global, cctx);
 
     if (fp != NULL && (fp->uf_flags & FC_DEAD) == 0)
 	return fp;
@@ -1575,6 +1577,38 @@
     return current_funccal;
 }
 
+/*
+ * Mark all functions of script "sid" as deleted.
+ */
+    void
+delete_script_functions(int sid)
+{
+    hashitem_T	*hi;
+    ufunc_T	*fp;
+    long_u	todo;
+    char	buf[30];
+    size_t	len;
+
+    buf[0] = K_SPECIAL;
+    buf[1] = KS_EXTRA;
+    buf[2] = (int)KE_SNR;
+    sprintf(buf + 3, "%d_", sid);
+    len = STRLEN(buf);
+
+    todo = func_hashtab.ht_used;
+    for (hi = func_hashtab.ht_array; todo > 0; ++hi)
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    if (STRNCMP(fp->uf_name, buf, len) == 0)
+	    {
+		fp = HI2UF(hi);
+		fp->uf_flags |= FC_DEAD;
+		func_clear(fp, TRUE);
+	    }
+	    --todo;
+	}
+}
+
 #if defined(EXITFREE) || defined(PROTO)
     void
 free_all_functions(void)
@@ -1884,22 +1918,22 @@
 	     * User defined function.
 	     */
 	    if (fp == NULL)
-		fp = find_func(rfname, NULL);
+		fp = find_func(rfname, FALSE, NULL);
 
 	    // Trigger FuncUndefined event, may load the function.
 	    if (fp == NULL
 		    && apply_autocmds(EVENT_FUNCUNDEFINED,
-						     rfname, rfname, TRUE, NULL)
+						    rfname, rfname, TRUE, NULL)
 		    && !aborting())
 	    {
 		// executed an autocommand, search for the function again
-		fp = find_func(rfname, NULL);
+		fp = find_func(rfname, FALSE, NULL);
 	    }
 	    // Try loading a package.
 	    if (fp == NULL && script_autoload(rfname, TRUE) && !aborting())
 	    {
 		// loaded a package, search for the function again
-		fp = find_func(rfname, NULL);
+		fp = find_func(rfname, FALSE, NULL);
 	    }
 	    if (fp == NULL)
 	    {
@@ -1908,7 +1942,7 @@
 		// If using Vim9 script try not local to the script.
 		// TODO: should not do this if the name started with "s:".
 		if (p != NULL)
-		    fp = find_func(p, NULL);
+		    fp = find_func(p, FALSE, NULL);
 	    }
 
 	    if (fp != NULL && (fp->uf_flags & FC_DELETED))
@@ -2079,6 +2113,8 @@
  * Get a function name, translating "<SID>" and "<SNR>".
  * Also handles a Funcref in a List or Dictionary.
  * Returns the function name in allocated memory, or NULL for failure.
+ * Set "*is_global" to TRUE when the function must be global, unless
+ * "is_global" is NULL.
  * flags:
  * TFN_INT:	    internal function name OK
  * TFN_QUIET:	    be quiet
@@ -2089,6 +2125,7 @@
     char_u *
 trans_function_name(
     char_u	**pp,
+    int		*is_global,
     int		skip,		// only find the end, don't evaluate
     int		flags,
     funcdict_T	*fdp,		// return: info about dictionary used
@@ -2239,7 +2276,11 @@
     {
 	// skip over "s:" and "g:"
 	if (lead == 2 || (lv.ll_name[0] == 'g' && lv.ll_name[1] == ':'))
+	{
+	    if (is_global != NULL && lv.ll_name[0] == 'g')
+		*is_global = TRUE;
 	    lv.ll_name += 2;
+	}
 	len = (int)(end - lv.ll_name);
     }
 
@@ -2347,6 +2388,7 @@
     int		saved_did_emsg;
     int		saved_wait_return = need_wait_return;
     char_u	*name = NULL;
+    int		is_global = FALSE;
     char_u	*p;
     char_u	*arg;
     char_u	*line_arg = NULL;
@@ -2463,7 +2505,8 @@
      * g:func	    global function name, same as "func"
      */
     p = eap->arg;
-    name = trans_function_name(&p, eap->skip, TFN_NO_AUTOLOAD, &fudi, NULL);
+    name = trans_function_name(&p, &is_global, eap->skip,
+						 TFN_NO_AUTOLOAD, &fudi, NULL);
     paren = (vim_strchr(p, '(') != NULL);
     if (name == NULL && (fudi.fd_dict == NULL || !paren) && !eap->skip)
     {
@@ -2503,7 +2546,7 @@
 	    *p = NUL;
 	if (!eap->skip && !got_int)
 	{
-	    fp = find_func(name, NULL);
+	    fp = find_func(name, is_global, NULL);
 	    if (fp == NULL && ASCII_ISUPPER(*eap->arg))
 	    {
 		char_u *up = untrans_function_name(name);
@@ -2511,7 +2554,7 @@
 		// With Vim9 script the name was made script-local, if not
 		// found try again with the original name.
 		if (up != NULL)
-		    fp = find_func(up, NULL);
+		    fp = find_func(up, FALSE, NULL);
 	    }
 
 	    if (fp != NULL)
@@ -2675,7 +2718,7 @@
 	{
 	    if (fudi.fd_dict != NULL && fudi.fd_newkey == NULL)
 		emsg(_(e_funcdict));
-	    else if (name != NULL && find_func(name, NULL) != NULL)
+	    else if (name != NULL && find_func(name, is_global, NULL) != NULL)
 		emsg_funcname(e_funcexts, name);
 	}
 
@@ -2825,7 +2868,7 @@
 		if (*p == '!')
 		    p = skipwhite(p + 1);
 		p += eval_fname_script(p);
-		vim_free(trans_function_name(&p, TRUE, 0, NULL, NULL));
+		vim_free(trans_function_name(&p, NULL, TRUE, 0, NULL, NULL));
 		if (*skipwhite(p) == '(')
 		{
 		    if (nesting == MAX_FUNC_NESTING - 1)
@@ -2963,7 +3006,7 @@
 	    goto erret;
 	}
 
-	fp = find_func_even_dead(name, NULL);
+	fp = find_func_even_dead(name, is_global, NULL);
 	if (fp != NULL)
 	{
 	    int dead = fp->uf_flags & FC_DEAD;
@@ -3208,6 +3251,8 @@
     fp->uf_varargs = varargs;
     if (sandbox)
 	flags |= FC_SANDBOX;
+    if (in_vim9script() && !ASCII_ISUPPER(*fp->uf_name))
+	flags |= FC_VIM9;
     fp->uf_flags = flags;
     fp->uf_calls = 0;
     fp->uf_cleared = FALSE;
@@ -3261,11 +3306,11 @@
 }
 
     int
-translated_function_exists(char_u *name)
+translated_function_exists(char_u *name, int is_global)
 {
     if (builtin_function(name, -1))
 	return has_internal_func(name);
-    return find_func(name, NULL) != NULL;
+    return find_func(name, is_global, NULL) != NULL;
 }
 
 /*
@@ -3289,17 +3334,18 @@
     char_u  *p;
     int	    n = FALSE;
     int	    flag;
+    int	    is_global = FALSE;
 
     flag = TFN_INT | TFN_QUIET | TFN_NO_AUTOLOAD;
     if (no_deref)
 	flag |= TFN_NO_DEREF;
-    p = trans_function_name(&nm, FALSE, flag, NULL, NULL);
+    p = trans_function_name(&nm, &is_global, FALSE, flag, NULL, NULL);
     nm = skipwhite(nm);
 
     // Only accept "funcname", "funcname ", "funcname (..." and
     // "funcname(...", not "funcname!...".
     if (p != NULL && (*nm == NUL || *nm == '('))
-	n = translated_function_exists(p);
+	n = translated_function_exists(p, is_global);
     vim_free(p);
     return n;
 }
@@ -3310,12 +3356,14 @@
 {
     char_u	*nm = name;
     char_u	*p;
+    int		is_global = FALSE;
 
-    p = trans_function_name(&nm, FALSE, TFN_INT|TFN_QUIET, NULL, NULL);
+    p = trans_function_name(&nm, &is_global, FALSE,
+						TFN_INT|TFN_QUIET, NULL, NULL);
 
-    if (p != NULL && *nm == NUL)
-	if (!check || translated_function_exists(p))
-	    return p;
+    if (p != NULL && *nm == NUL
+		       && (!check || translated_function_exists(p, is_global)))
+	return p;
 
     vim_free(p);
     return NULL;
@@ -3376,9 +3424,10 @@
     char_u	*p;
     char_u	*name;
     funcdict_T	fudi;
+    int		is_global = FALSE;
 
     p = eap->arg;
-    name = trans_function_name(&p, eap->skip, 0, &fudi, NULL);
+    name = trans_function_name(&p, &is_global, eap->skip, 0, &fudi, NULL);
     vim_free(fudi.fd_newkey);
     if (name == NULL)
     {
@@ -3397,7 +3446,7 @@
 	*p = NUL;
 
     if (!eap->skip)
-	fp = find_func(name, NULL);
+	fp = find_func(name, is_global, NULL);
     vim_free(name);
 
     if (!eap->skip)
@@ -3413,6 +3462,11 @@
 	    semsg(_("E131: Cannot delete function %s: It is in use"), eap->arg);
 	    return;
 	}
+	if (fp->uf_flags & FC_VIM9)
+	{
+	    semsg(_("E1084: Cannot delete Vim9 script function %s"), eap->arg);
+	    return;
+	}
 
 	if (fudi.fd_dict != NULL)
 	{
@@ -3452,7 +3506,7 @@
 
     if (name == NULL || !func_name_refcount(name))
 	return;
-    fp = find_func(name, NULL);
+    fp = find_func(name, FALSE, NULL);
     if (fp == NULL && isdigit(*name))
     {
 #ifdef EXITFREE
@@ -3495,7 +3549,7 @@
 
     if (name == NULL || !func_name_refcount(name))
 	return;
-    fp = find_func(name, NULL);
+    fp = find_func(name, FALSE, NULL);
     if (fp != NULL)
 	++fp->uf_refcount;
     else if (isdigit(*name))
@@ -3611,7 +3665,8 @@
 	return;
     }
 
-    tofree = trans_function_name(&arg, eap->skip, TFN_INT, &fudi, &partial);
+    tofree = trans_function_name(&arg, NULL, eap->skip,
+						     TFN_INT, &fudi, &partial);
     if (fudi.fd_newkey != NULL)
     {
 	// Still need to give an error message for missing key.
@@ -3969,7 +4024,7 @@
 					      : rettv->vval.v_partial->pt_name;
 	// Translate "s:func" to the stored function name.
 	fname = fname_trans_sid(fname, fname_buf, &tofree, &error);
-	fp = find_func(fname, NULL);
+	fp = find_func(fname, FALSE, NULL);
 	vim_free(tofree);
     }
 
@@ -4391,7 +4446,7 @@
     if (fp_in == NULL)
     {
 	fname = fname_trans_sid(name, fname_buf, &tofree, &error);
-	fp = find_func(fname, NULL);
+	fp = find_func(fname, FALSE, NULL);
     }
     if (fp != NULL)
     {
diff --git a/src/version.c b/src/version.c
index fa91a2b..d58ef8a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    650,
+/**/
     649,
 /**/
     648,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 0e9abac..89a8677 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2210,7 +2210,7 @@
     static int
 generate_funcref(cctx_T *cctx, char_u *name)
 {
-    ufunc_T *ufunc = find_func(name, cctx);
+    ufunc_T *ufunc = find_func(name, FALSE, cctx);
 
     if (ufunc == NULL)
 	return FAIL;
@@ -2452,7 +2452,7 @@
     }
 
     // If we can find the function by name generate the right call.
-    ufunc = find_func(name, cctx);
+    ufunc = find_func(name, FALSE, cctx);
     if (ufunc != NULL)
     {
 	res = generate_CALL(cctx, ufunc, argcount);
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 9ea7daf..5251d48 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -400,7 +400,7 @@
 	return call_bfunc(func_idx, argcount, ectx);
     }
 
-    ufunc = find_func(name, NULL);
+    ufunc = find_func(name, FALSE, NULL);
     if (ufunc != NULL)
 	return call_ufunc(ufunc, argcount, ectx, iptr);
 
@@ -1944,8 +1944,9 @@
     int		current;
     int		line_idx = 0;
     int		prev_current = 0;
+    int		is_global = FALSE;
 
-    fname = trans_function_name(&arg, FALSE,
+    fname = trans_function_name(&arg, &is_global, FALSE,
 	     TFN_INT | TFN_QUIET | TFN_NO_AUTOLOAD | TFN_NO_DEREF, NULL, NULL);
     if (fname == NULL)
     {
@@ -1953,14 +1954,14 @@
 	return;
     }
 
-    ufunc = find_func(fname, NULL);
+    ufunc = find_func(fname, is_global, NULL);
     if (ufunc == NULL)
     {
 	char_u *p = untrans_function_name(fname);
 
 	if (p != NULL)
 	    // Try again without making it script-local.
-	    ufunc = find_func(p, NULL);
+	    ufunc = find_func(p, FALSE, NULL);
     }
     vim_free(fname);
     if (ufunc == NULL)
diff --git a/src/vim9script.c b/src/vim9script.c
index e74a7b9..afd6a4a 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -217,7 +217,7 @@
 	funcname[1] = KS_EXTRA;
 	funcname[2] = (int)KE_SNR;
 	sprintf((char *)funcname + 3, "%ld_%s", (long)sid, name);
-	*ufunc = find_func(funcname, NULL);
+	*ufunc = find_func(funcname, FALSE, NULL);
 	if (funcname != buffer)
 	    vim_free(funcname);