diff --git a/src/crypt.c b/src/crypt.c
index bed76a9..b2b50d4 100644
--- a/src/crypt.c
+++ b/src/crypt.c
@@ -73,6 +73,10 @@
 							char_u *p2, int last);
 } cryptmethod_T;
 
+static int crypt_sodium_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
+static long crypt_sodium_buffer_decode(cryptstate_T *state, char_u *from, size_t len, char_u **buf_out, int last);
+static long crypt_sodium_buffer_encode(cryptstate_T *state, char_u *from, size_t len, char_u **buf_out, int last);
+
 // index is method_nr of cryptstate_T, CRYPT_M_*
 static cryptmethod_T cryptmethods[CRYPT_M_COUNT] = {
     // PK_Zip; very weak
@@ -850,7 +854,7 @@
     }
 }
 
-    int
+    static int
 crypt_sodium_init(
     cryptstate_T	*state UNUSED,
     char_u		*key UNUSED,
@@ -1030,7 +1034,7 @@
  * Encrypt "from[len]" into "to[len]".
  * "from" and "to" can be equal to encrypt in place.
  */
-    long
+    static long
 crypt_sodium_buffer_encode(
     cryptstate_T *state UNUSED,
     char_u	*from UNUSED,
@@ -1080,7 +1084,7 @@
  * Decrypt "from[len]" into "to[len]".
  * "from" and "to" can be equal to encrypt in place.
  */
-    long
+    static long
 crypt_sodium_buffer_decode(
     cryptstate_T *state UNUSED,
     char_u	*from UNUSED,
diff --git a/src/evalvars.c b/src/evalvars.c
index f7939cb..779627c 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -648,7 +648,7 @@
  * Used for a heredoc assignment.
  * Returns NULL for an error.
  */
-    char_u *
+    static char_u *
 eval_all_expr_in_str(char_u *str)
 {
     garray_T	ga;
diff --git a/src/gui.c b/src/gui.c
index 4408545..e708a27 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -32,6 +32,7 @@
 static void gui_update_horiz_scrollbar(int);
 static void gui_set_fg_color(char_u *name);
 static void gui_set_bg_color(char_u *name);
+static void init_gui_options(void);
 static win_T *xy2win(int x, int y, mouse_find_T popup);
 
 #ifdef GUI_MAY_FORK
@@ -1395,7 +1396,7 @@
 }
 
 #if defined(FEAT_MENU) || defined(PROTO)
-    void
+    static void
 gui_position_menu(void)
 {
 # if !defined(FEAT_GUI_GTK) && !defined(FEAT_GUI_MOTIF)
@@ -4815,7 +4816,7 @@
 /*
  * Option initializations that can only be done after opening the GUI window.
  */
-    void
+    static void
 init_gui_options(void)
 {
     // Set the 'background' option according to the lightness of the
diff --git a/src/highlight.c b/src/highlight.c
index 75a310f..bf876d1 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -566,7 +566,7 @@
  * "boldp" will be set to TRUE or FALSE for a foreground color when using 8
  * colors, otherwise it will be unchanged.
  */
-    int
+    static int
 lookup_color(int idx, int foreground, int *boldp)
 {
     int		color = color_numbers_16[idx];
diff --git a/src/proto/crypt.pro b/src/proto/crypt.pro
index d6c7b7f..7913694 100644
--- a/src/proto/crypt.pro
+++ b/src/proto/crypt.pro
@@ -24,9 +24,6 @@
 void crypt_check_current_method(void);
 char_u *crypt_get_key(int store, int twice);
 void crypt_append_msg(buf_T *buf);
-int crypt_sodium_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
-long crypt_sodium_buffer_encode(cryptstate_T *state, char_u *from, size_t len, char_u **buf_out, int last);
-long crypt_sodium_buffer_decode(cryptstate_T *state, char_u *from, size_t len, char_u **buf_out, int last);
 int crypt_sodium_munlock(void *const addr, const size_t len);
 void crypt_sodium_randombytes_buf(void *const buf, const size_t size);
 /* vim: set ft=c : */
diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index 4683c15..253af6d 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -14,7 +14,6 @@
 void prepare_vimvar(int idx, typval_T *save_tv);
 void restore_vimvar(int idx, typval_T *save_tv);
 char_u *eval_one_expr_in_str(char_u *p, garray_T *gap, int evaluate);
-char_u *eval_all_expr_in_str(char_u *str);
 list_T *heredoc_get(exarg_T *eap, char_u *cmd, int script_get, int vim9compile);
 void ex_var(exarg_T *eap);
 void ex_let(exarg_T *eap);
diff --git a/src/proto/gui.pro b/src/proto/gui.pro
index 2a0ac80..1a04248 100644
--- a/src/proto/gui.pro
+++ b/src/proto/gui.pro
@@ -9,7 +9,6 @@
 int gui_get_wide_font(void);
 void gui_set_ligatures(void);
 void gui_update_cursor(int force, int clear_selection);
-void gui_position_menu(void);
 int gui_get_base_width(void);
 int gui_get_base_height(void);
 void gui_resize_shell(int pixel_width, int pixel_height);
@@ -51,7 +50,6 @@
 guicolor_T gui_get_color(char_u *name);
 int gui_get_lightness(guicolor_T pixel);
 char_u *gui_bg_default(void);
-void init_gui_options(void);
 void gui_new_scrollbar_colors(void);
 void gui_focus_change(int in_focus);
 void gui_mouse_moved(int x, int y);
diff --git a/src/proto/highlight.pro b/src/proto/highlight.pro
index 5635a17..33f90c6 100644
--- a/src/proto/highlight.pro
+++ b/src/proto/highlight.pro
@@ -4,7 +4,6 @@
 int highlight_link_id(int id);
 void init_highlight(int both, int reset);
 int load_colors(char_u *name);
-int lookup_color(int idx, int foreground, int *boldp);
 void do_highlight(char_u *line, int forceit, int init);
 void free_highlight(void);
 void restore_cterm_colors(void);
diff --git a/src/proto/scriptfile.pro b/src/proto/scriptfile.pro
index a38f258..205028d 100644
--- a/src/proto/scriptfile.pro
+++ b/src/proto/scriptfile.pro
@@ -40,7 +40,6 @@
 void ex_finish(exarg_T *eap);
 void do_finish(exarg_T *eap, int reanimate);
 int source_finished(char_u *(*fgetline)(int, void *, int, getline_opt_T), void *cookie);
-char_u *script_name_after_autoload(scriptitem_T *si);
 char_u *get_autoload_prefix(scriptitem_T *si);
 char_u *may_prefix_autoload(char_u *name);
 char_u *autoload_name(char_u *name);
diff --git a/src/proto/userfunc.pro b/src/proto/userfunc.pro
index 5372760..427d47b 100644
--- a/src/proto/userfunc.pro
+++ b/src/proto/userfunc.pro
@@ -38,7 +38,6 @@
 int call_func(char_u *funcname, int len, typval_T *rettv, int argcount_in, typval_T *argvars_in, funcexe_T *funcexe);
 char_u *printable_func_name(ufunc_T *fp);
 char_u *trans_function_name(char_u **pp, int *is_global, int skip, int flags, funcdict_T *fdp, partial_T **partial, type_T **type);
-char_u *untrans_function_name(char_u *name);
 char_u *get_scriptlocal_funcname(char_u *funcname);
 char_u *alloc_printable_func_name(char_u *fname);
 char_u *save_function_name(char_u **name, int *is_global, int skip, int flags, funcdict_T *fudi);
diff --git a/src/scriptfile.c b/src/scriptfile.c
index f3a5783..952f2ef 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -2346,7 +2346,7 @@
  * Find the path of a script below the "autoload" directory.
  * Returns NULL if there is no "/autoload/" in the script name.
  */
-    char_u *
+    static char_u *
 script_name_after_autoload(scriptitem_T *si)
 {
     char_u	*p = si->sn_name;
diff --git a/src/testdir/test_fold.vim b/src/testdir/test_fold.vim
index 3bdd99f..2618084 100644
--- a/src/testdir/test_fold.vim
+++ b/src/testdir/test_fold.vim
@@ -1476,6 +1476,8 @@
   call assert_equal([0, 1, 1, 2, 2], range(1, 5)->map('foldlevel(v:val)'))
   call append(2, 'line 2.5')
   call assert_equal([0, 1, 0, 1, 2, 2], range(1, 6)->map('foldlevel(v:val)'))
+  3d
+  call assert_equal([0, 1, 1, 2, 2], range(1, 5)->map('foldlevel(v:val)'))
   bw!
 endfunc
 
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 182d570..2a97375 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -3363,8 +3363,11 @@
   cgetexpr ['Compiler: ' . repeat('a', 1015), 'File1:10:Hello World']
 
   set efm=%DEntering\ directory\ %f,%f:%l:%m
-  cgetexpr ['Entering directory ' . repeat('a', 1006),
-	      \ 'File1:10:Hello World']
+  let lines =<< trim eval END
+    Entering directory $"{repeat('a', 1006)}"
+    File1:10:Hello World
+  END
+  cgetexpr lines
   set efm&vim
 endfunc
 
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index e83e320..0243595 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -3364,6 +3364,22 @@
   v9.CheckDefAndScriptFailure(['searchdecl(1)'], ['E1013: Argument 1: type mismatch, expected string but got number', 'E1174: String required for argument 1'])
   v9.CheckDefAndScriptFailure(['searchdecl("a", 2)'], ['E1013: Argument 2: type mismatch, expected bool but got number', 'E1212: Bool required for argument 2'])
   v9.CheckDefAndScriptFailure(['searchdecl("a", true, 2)'], ['E1013: Argument 3: type mismatch, expected bool but got number', 'E1212: Bool required for argument 3'])
+
+  # search for an empty string declaration
+  var lines: list<string> =<< trim END
+    int var1;
+
+    {
+       int var2;
+       var1 = 10;
+    }
+  END
+  new
+  setline(1, lines)
+  cursor(5, 4)
+  searchdecl('')
+  assert_equal([3, 1], [line('.'), col('.')])
+  bw!
 enddef
 
 def Test_searchpair()
diff --git a/src/userfunc.c b/src/userfunc.c
index 9b960b7..9f84422 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -32,6 +32,7 @@
 static void funccal_unref(funccall_T *fc, ufunc_T *fp, int force);
 static void func_clear(ufunc_T *fp, int force);
 static int func_free(ufunc_T *fp, int force);
+static char_u *untrans_function_name(char_u *name);
 
     void
 func_init()
@@ -4073,7 +4074,7 @@
  * This can be used to first search for a script-local function and fall back
  * to the global function if not found.
  */
-    char_u *
+    static char_u *
 untrans_function_name(char_u *name)
 {
     char_u *p;
diff --git a/src/version.c b/src/version.c
index 74e080f..2faf3bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3,
+/**/
     2,
 /**/
     1,