diff --git a/src/autocmd.c b/src/autocmd.c
index 640032b..8a6896b 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -1678,10 +1678,7 @@
 	    && has_cursorhold()
 	    && reg_recording == 0
 	    && typebuf.tb_len == 0
-#ifdef FEAT_INS_EXPAND
-	    && !ins_compl_active()
-#endif
-	    )
+	    && !ins_compl_active())
     {
 	state = get_real_state();
 	if (state == NORMAL_BUSY || (state & INSERT) != 0)
@@ -1726,7 +1723,6 @@
     return (first_autopat[(int)EVENT_TEXTCHANGEDI] != NULL);
 }
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * Return TRUE when there is a TextChangedP autocommand defined.
  */
@@ -1735,7 +1731,6 @@
 {
     return (first_autopat[(int)EVENT_TEXTCHANGEDP] != NULL);
 }
-#endif
 
 /*
  * Return TRUE when there is an InsertCharPre autocommand defined.
@@ -2044,9 +2039,7 @@
     if (!autocmd_busy)
     {
 	save_search_patterns();
-#ifdef FEAT_INS_EXPAND
 	if (!ins_compl_active())
-#endif
 	{
 	    saveRedobuff(&save_redo);
 	    did_save_redobuff = TRUE;
diff --git a/src/buffer.c b/src/buffer.c
index f9686a7..a9aa30c 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -310,9 +310,7 @@
     /* Set last_changedtick to avoid triggering a TextChanged autocommand right
      * after it was added. */
     curbuf->b_last_changedtick = CHANGEDTICK(curbuf);
-#ifdef FEAT_INS_EXPAND
     curbuf->b_last_changedtick_pum = CHANGEDTICK(curbuf);
-#endif
 
     /* require "!" to overwrite the file, because it wasn't read completely */
 #ifdef FEAT_EVAL
@@ -2228,9 +2226,7 @@
 #if defined(FEAT_CINDENT) || defined(FEAT_SMARTINDENT)
     clear_string_option(&buf->b_p_cinw);
 #endif
-#ifdef FEAT_INS_EXPAND
     clear_string_option(&buf->b_p_cpt);
-#endif
 #ifdef FEAT_COMPL_FUNC
     clear_string_option(&buf->b_p_cfu);
     clear_string_option(&buf->b_p_ofu);
@@ -2247,10 +2243,8 @@
 #ifdef FEAT_EVAL
     clear_string_option(&buf->b_p_tfu);
 #endif
-#ifdef FEAT_INS_EXPAND
     clear_string_option(&buf->b_p_dict);
     clear_string_option(&buf->b_p_tsr);
-#endif
 #ifdef FEAT_TEXTOBJ
     clear_string_option(&buf->b_p_qe);
 #endif
diff --git a/src/change.c b/src/change.c
index 23c9587..ac2cc30 100644
--- a/src/change.c
+++ b/src/change.c
@@ -1008,10 +1008,7 @@
     // show the match for right parens and braces.
     if (p_sm && (State & INSERT)
 	    && msg_silent == 0
-#ifdef FEAT_INS_EXPAND
-	    && !ins_compl_active()
-#endif
-       )
+	    && !ins_compl_active())
     {
 	if (has_mbyte)
 	    showmatch(mb_ptr2char(buf));
diff --git a/src/charset.c b/src/charset.c
index 50ca617..d47ccfd 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -314,8 +314,6 @@
     }
 }
 
-#if defined(FEAT_EVAL) || defined(FEAT_TITLE) || defined(FEAT_INS_EXPAND) \
-	|| defined(PROTO)
 /*
  * Translate a string into allocated memory, replacing special chars with
  * printable chars.  Returns NULL when out of memory.
@@ -382,9 +380,7 @@
     }
     return res;
 }
-#endif
 
-#if defined(FEAT_SYN_HL) || defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * Convert the string "str[orglen]" to do ignore-case comparing.  Uses the
  * current locale.
@@ -495,7 +491,6 @@
 	return (char_u *)ga.ga_data;
     return buf;
 }
-#endif
 
 /*
  * Catch 22: g_chartab[] can't be initialized before the options are
@@ -2015,6 +2010,7 @@
 
 /*
  * backslash_halve() plus save the result in allocated memory.
+ * However, returns "p" when out of memory.
  */
     char_u *
 backslash_halve_save(char_u *p)
diff --git a/src/edit.c b/src/edit.c
index 83b4be7..cc41d49 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -18,11 +18,9 @@
 #define BACKSPACE_WORD_NOT_SPACE    3
 #define BACKSPACE_LINE		    4
 
-#ifdef FEAT_INS_EXPAND
 /* Set when doing something for completion that may call edit() recursively,
  * which is not allowed. */
 static int	compl_busy = FALSE;
-#endif /* FEAT_INS_EXPAND */
 
 
 static void ins_ctrl_v(void);
@@ -194,7 +192,6 @@
 	return FALSE;
     }
 
-#ifdef FEAT_INS_EXPAND
     /* Don't allow recursive insert mode when busy with completion. */
     if (ins_compl_active() || compl_busy || pum_visible())
     {
@@ -202,7 +199,6 @@
 	return FALSE;
     }
     ins_compl_clear();	    /* clear stuff for CTRL-X mode */
-#endif
 
     /*
      * Trigger InsertEnter autocommands.  Do not do this for "r<CR>" or "grx".
@@ -462,11 +458,7 @@
 	if (update_Insstart_orig)
 	    Insstart_orig = Insstart;
 
-	if (stop_insert_mode
-#ifdef FEAT_INS_EXPAND
-		&& !pum_visible()
-#endif
-		)
+	if (stop_insert_mode && !pum_visible())
 	{
 	    /* ":stopinsert" used or 'insertmode' reset */
 	    count = 0;
@@ -631,7 +623,6 @@
 	    c = hkmap(c);		/* Hebrew mode mapping */
 #endif
 
-#ifdef FEAT_INS_EXPAND
 	/*
 	 * Special handling of keys while the popup menu is visible or wanted
 	 * and the cursor is still in the completed word.  Only when there is
@@ -701,7 +692,6 @@
 	ins_compl_init_get_longest();
 	if (ins_compl_prep(c))
 	    continue;
-#endif
 
 	/* CTRL-\ CTRL-N goes to Normal mode,
 	 * CTRL-\ CTRL-G goes to mode selected with 'insertmode',
@@ -740,10 +730,8 @@
 	c = do_digraph(c);
 #endif
 
-#ifdef FEAT_INS_EXPAND
 	if ((c == Ctrl_V || c == Ctrl_Q) && ctrl_x_mode_cmdline())
 	    goto docomplete;
-#endif
 	if (c == Ctrl_V || c == Ctrl_Q)
 	{
 	    ins_ctrl_v();
@@ -752,11 +740,7 @@
 	}
 
 #ifdef FEAT_CINDENT
-	if (cindent_on()
-# ifdef FEAT_INS_EXPAND
-		&& ctrl_x_mode_none()
-# endif
-	   )
+	if (cindent_on() && ctrl_x_mode_none())
 	{
 	    /* A key name preceded by a bang means this key is not to be
 	     * inserted.  Skip ahead to the re-indenting below.
@@ -950,21 +934,20 @@
 #endif
 
 	case Ctrl_D:	/* Make indent one shiftwidth smaller. */
-#if defined(FEAT_INS_EXPAND) && defined(FEAT_FIND_ID)
+#if defined(FEAT_FIND_ID)
 	    if (ctrl_x_mode_path_defines())
 		goto docomplete;
 #endif
 	    /* FALLTHROUGH */
 
 	case Ctrl_T:	/* Make indent one shiftwidth greater. */
-# ifdef FEAT_INS_EXPAND
 	    if (c == Ctrl_T && ctrl_x_mode_thesaurus())
 	    {
 		if (has_compl_option(FALSE))
 		    goto docomplete;
 		break;
 	    }
-# endif
+
 	    ins_shift(c, lastc);
 	    auto_format(FALSE, TRUE);
 	    inserted_space = FALSE;
@@ -1131,10 +1114,8 @@
 	    break;
 
 	case K_UP:	/* <Up> */
-#ifdef FEAT_INS_EXPAND
 	    if (pum_visible())
 		goto docomplete;
-#endif
 	    if (mod_mask & MOD_MASK_SHIFT)
 		ins_pageup();
 	    else
@@ -1144,18 +1125,14 @@
 	case K_S_UP:	/* <S-Up> */
 	case K_PAGEUP:
 	case K_KPAGEUP:
-#ifdef FEAT_INS_EXPAND
 	    if (pum_visible())
 		goto docomplete;
-#endif
 	    ins_pageup();
 	    break;
 
 	case K_DOWN:	/* <Down> */
-#ifdef FEAT_INS_EXPAND
 	    if (pum_visible())
 		goto docomplete;
-#endif
 	    if (mod_mask & MOD_MASK_SHIFT)
 		ins_pagedown();
 	    else
@@ -1165,10 +1142,8 @@
 	case K_S_DOWN:	/* <S-Down> */
 	case K_PAGEDOWN:
 	case K_KPAGEDOWN:
-#ifdef FEAT_INS_EXPAND
 	    if (pum_visible())
 		goto docomplete;
-#endif
 	    ins_pagedown();
 	    break;
 
@@ -1183,7 +1158,7 @@
 	    /* FALLTHROUGH */
 
 	case TAB:	/* TAB or Complete patterns along path */
-#if defined(FEAT_INS_EXPAND) && defined(FEAT_FIND_ID)
+#if defined(FEAT_FIND_ID)
 	    if (ctrl_x_mode_path_patterns())
 		goto docomplete;
 #endif
@@ -1235,25 +1210,20 @@
 	    inserted_space = FALSE;
 	    break;
 
-#if defined(FEAT_DIGRAPHS) || defined(FEAT_INS_EXPAND)
 	case Ctrl_K:	    /* digraph or keyword completion */
-# ifdef FEAT_INS_EXPAND
 	    if (ctrl_x_mode_dictionary())
 	    {
 		if (has_compl_option(TRUE))
 		    goto docomplete;
 		break;
 	    }
-# endif
-# ifdef FEAT_DIGRAPHS
+#ifdef FEAT_DIGRAPHS
 	    c = ins_digraph();
 	    if (c == NUL)
 		break;
-# endif
-	    goto normalchar;
 #endif
+	    goto normalchar;
 
-#ifdef FEAT_INS_EXPAND
 	case Ctrl_X:	/* Enter CTRL-X mode */
 	    ins_ctrl_x();
 	    break;
@@ -1273,12 +1243,9 @@
 	    if (!ctrl_x_mode_spell())
 		goto normalchar;
 	    goto docomplete;
-#endif
 
 	case Ctrl_L:	/* Whole line completion after ^X */
-#ifdef FEAT_INS_EXPAND
 	    if (!ctrl_x_mode_whole_line())
-#endif
 	    {
 		/* CTRL-L with 'insertmode' set: Leave Insert mode */
 		if (p_im)
@@ -1289,7 +1256,6 @@
 		}
 		goto normalchar;
 	    }
-#ifdef FEAT_INS_EXPAND
 	    /* FALLTHROUGH */
 
 	case Ctrl_P:	/* Do previous/next pattern completion */
@@ -1313,7 +1279,6 @@
 #endif
 	    compl_busy = FALSE;
 	    break;
-#endif /* FEAT_INS_EXPAND */
 
 	case Ctrl_Y:	/* copy from previous line or scroll down */
 	case Ctrl_E:	/* copy from next line	   or scroll up */
@@ -1419,11 +1384,7 @@
 	    inserted_space = FALSE;
 
 #ifdef FEAT_CINDENT
-	if (can_cindent && cindent_on()
-# ifdef FEAT_INS_EXPAND
-		&& ctrl_x_mode_normal()
-# endif
-	   )
+	if (can_cindent && cindent_on() && ctrl_x_mode_normal())
 	{
 force_cindent:
 	    /*
@@ -1478,10 +1439,7 @@
 # endif
 		)
 	    && !EQUAL_POS(last_cursormoved, curwin->w_cursor)
-# ifdef FEAT_INS_EXPAND
-	    && !pum_visible()
-# endif
-       )
+	    && !pum_visible())
     {
 # ifdef FEAT_SYN_HL
 	/* Need to update the screen first, to make sure syntax
@@ -1516,10 +1474,7 @@
     /* Trigger TextChangedI if b_changedtick differs. */
     if (ready && has_textchangedI()
 	    && curbuf->b_last_changedtick != CHANGEDTICK(curbuf)
-#ifdef FEAT_INS_EXPAND
-	    && !pum_visible()
-#endif
-	    )
+	    && !pum_visible())
     {
 	aco_save_T	aco;
 	varnumber_T	tick = CHANGEDTICK(curbuf);
@@ -1534,7 +1489,6 @@
 					(linenr_T)(curwin->w_cursor.lnum + 1));
     }
 
-#ifdef FEAT_INS_EXPAND
     /* Trigger TextChangedP if b_changedtick differs. When the popupmenu closes
      * TextChangedI will need to trigger for backwards compatibility, thus use
      * different b_last_changedtick* variables. */
@@ -1554,7 +1508,6 @@
 	    u_save(curwin->w_cursor.lnum,
 					(linenr_T)(curwin->w_cursor.lnum + 1));
     }
-#endif
 
 #if defined(FEAT_CONCEAL)
     if ((conceal_update_lines
@@ -4328,10 +4281,8 @@
 {
     int		c;
 
-#ifdef FEAT_INS_EXPAND
-    /* Right after CTRL-X the cursor will be after the ruler. */
+    // Right after CTRL-X the cursor will be after the ruler.
     setcursor();
-#endif
 
     /*
      * Don't map the second key. This also prevents the mode message to be
@@ -5253,9 +5204,7 @@
 {
     pos_T	tpos;
     win_T	*old_curwin = curwin, *wp;
-# ifdef FEAT_INS_EXPAND
     int		did_scroll = FALSE;
-# endif
 
     tpos = curwin->w_cursor;
 
@@ -5276,10 +5225,8 @@
     if (curwin == old_curwin)
 	undisplay_dollar();
 
-# ifdef FEAT_INS_EXPAND
     /* Don't scroll the window in which completion is being done. */
     if (!pum_visible() || curwin != old_curwin)
-# endif
     {
 	if (dir == MSCR_DOWN || dir == MSCR_UP)
 	{
@@ -5306,9 +5253,7 @@
 	    gui_do_horiz_scroll(val, TRUE);
 	}
 #endif
-# ifdef FEAT_INS_EXPAND
 	did_scroll = TRUE;
-# endif
     }
 
     curwin->w_redr_status = TRUE;
@@ -5316,7 +5261,6 @@
     curwin = old_curwin;
     curbuf = curwin->w_buffer;
 
-# ifdef FEAT_INS_EXPAND
     /* The popup menu may overlay the window, need to redraw it.
      * TODO: Would be more efficient to only redraw the windows that are
      * overlapped by the popup menu. */
@@ -5325,7 +5269,6 @@
 	redraw_all_later(NOT_VALID);
 	ins_compl_show_pum();
     }
-# endif
 
     if (!EQUAL_POS(curwin->w_cursor, tpos))
     {
@@ -6256,7 +6199,6 @@
 {
     int	    c = tc;
 
-#ifdef FEAT_INS_EXPAND
     if (ctrl_x_mode_scroll())
     {
 	if (c == Ctrl_Y)
@@ -6266,7 +6208,6 @@
 	redraw_later(VALID);
     }
     else
-#endif
     {
 	c = ins_copychar(curwin->w_cursor.lnum + (c == Ctrl_Y ? -1 : 1));
 	if (c != NUL)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 2f66b17..d2a0c64 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -499,12 +499,10 @@
     {"cindent",		1, 1, 0,	  f_cindent},
     {"clearmatches",	0, 1, 0,	  f_clearmatches},
     {"col",		1, 1, 0,	  f_col},
-#if defined(FEAT_INS_EXPAND)
     {"complete",	2, 2, 0,	  f_complete},
     {"complete_add",	1, 1, 0,	  f_complete_add},
     {"complete_check",	0, 0, 0,	  f_complete_check},
     {"complete_info",	0, 1, 0,	  f_complete_info},
-#endif
     {"confirm",		1, 4, 0,	  f_confirm},
     {"copy",		1, 1, FEARG_1,	  f_copy},
 #ifdef FEAT_FLOAT
@@ -5951,9 +5949,7 @@
 #if defined(HAVE_ICONV_H) && defined(USE_ICONV)
 	"iconv",
 #endif
-#ifdef FEAT_INS_EXPAND
 	"insert_expand",
-#endif
 #ifdef FEAT_JOB_CHANNEL
 	"job",
 #endif
@@ -7638,12 +7634,10 @@
 		buf[0] = 'R';
 	    else
 		buf[0] = 'i';
-#ifdef FEAT_INS_EXPAND
 	    if (ins_compl_active())
 		buf[1] = 'c';
 	    else if (ctrl_x_mode_not_defined_yet())
 		buf[1] = 'x';
-#endif
 	}
     }
     else if ((State & CMDLINE) || exmode_active)
@@ -7886,9 +7880,7 @@
 {
     if (rettv_dict_alloc(rettv) != OK)
 	return;
-#ifdef FEAT_INS_EXPAND
     pum_set_event_info(rettv->vval.v_dict);
-#endif
 }
 
 /*
@@ -7897,10 +7889,8 @@
     static void
 f_pumvisible(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
 {
-#ifdef FEAT_INS_EXPAND
     if (pum_visible())
 	rettv->vval.v_number = 1;
-#endif
 }
 
 #ifdef FEAT_PYTHON3
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 77d3943..ee3291c 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4391,12 +4391,10 @@
 			    subflags.do_ask = FALSE;
 			    break;
 			}
-#ifdef FEAT_INS_EXPAND
 			if (typed == Ctrl_E)
 			    scrollup_clamp();
 			else if (typed == Ctrl_Y)
 			    scrolldown_clamp();
-#endif
 		    }
 		    State = save_State;
 #ifdef FEAT_MOUSE
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 6418ffe..5d1c8ef 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -4040,11 +4040,9 @@
     /* Don't execute autocommands while creating the window. */
     block_autocmds();
 
-#if defined(FEAT_INS_EXPAND)
     // When using completion in Insert mode with <C-R>=<C-F> one can open the
     // command line window, but we don't want the popup menu then.
     pum_undisplay();
-#endif
 
     /* don't use a new tab page */
     cmdmod.tab = 0;
diff --git a/src/feature.h b/src/feature.h
index 1c5128a..8afa987 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -106,6 +106,7 @@
  * +user_commands	Allow the user to define his own commands.
  * +multi_byte		Generic multi-byte character handling.
  * +cmdline_compl	completion of mappings/abbreviations in cmdline mode.
+ * +insert_expand	CTRL-N/CTRL-P/CTRL-X in insert mode.
  *
  * Obsolete:
  * +tag_old_static	Old style static tags: "file:tag  file  ..".
@@ -170,14 +171,6 @@
 # define FEAT_KEYMAP
 #endif
 
-/*
- * +insert_expand	CTRL-N/CTRL-P/CTRL-X in insert mode. Takes about
- *			4Kbyte of code.
- */
-#ifdef FEAT_NORMAL
-# define FEAT_INS_EXPAND
-#endif
-
 #ifdef FEAT_NORMAL
 # define VIM_BACKTICK		/* internal backtick expansion */
 #endif
@@ -343,7 +336,7 @@
 /*
  *			Insert mode completion with 'completefunc'.
  */
-#if defined(FEAT_INS_EXPAND) && defined(FEAT_EVAL)
+#if defined(FEAT_EVAL)
 # define FEAT_COMPL_FUNC
 #endif
 
@@ -621,7 +614,7 @@
 /*
  * popup menu in a terminal
  */
-#if defined(FEAT_MENU) && !defined(ALWAYS_USE_GUI) && defined(FEAT_INS_EXPAND)
+#if defined(FEAT_MENU) && !defined(ALWAYS_USE_GUI)
 # define FEAT_TERM_POPUP_MENU
 #endif
 
diff --git a/src/getchar.c b/src/getchar.c
index 2fb8438..eeb3342 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -1481,7 +1481,6 @@
 }
 #endif
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * Return TRUE when reading keys from a script file.
  */
@@ -1490,7 +1489,6 @@
 {
     return scriptin[curscript] != NULL;
 }
-#endif
 
 /*
  * This function is called just before doing a blocking wait.  Thus after
@@ -1866,7 +1864,6 @@
 }
 #endif
 
-#if defined(FEAT_INS_EXPAND) || defined(FEAT_EVAL) || defined(PROTO)
 /*
  * Check if any character is available, also half an escape sequence.
  * Trick: when no typeahead found, but there is something in the typeahead
@@ -1882,7 +1879,6 @@
 	c = ESC;
     return c;
 }
-#endif
 
 /*
  * Call vpeekc() without causing anything to be mapped.
@@ -1963,12 +1959,9 @@
 	    && !(State == HITRETURN && (tb_c1 == CAR || tb_c1 == ' '))
 	    && State != ASKMORE
 	    && State != CONFIRM
-#ifdef FEAT_INS_EXPAND
 	    && !((ctrl_x_mode_not_default() && vim_is_ctrl_x_key(tb_c1))
 		    || ((compl_cont_status & CONT_LOCAL)
-			&& (tb_c1 == Ctrl_N || tb_c1 == Ctrl_P)))
-#endif
-	    )
+			&& (tb_c1 == Ctrl_N || tb_c1 == Ctrl_P))))
     {
 #ifdef FEAT_LANGMAP
 	if (tb_c1 == K_SPECIAL)
diff --git a/src/globals.h b/src/globals.h
index 61cb2b2..d0837d3 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -129,7 +129,6 @@
  */
 EXTERN colnr_T	dollar_vcol INIT(= -1);
 
-#ifdef FEAT_INS_EXPAND
 /*
  * Variables for Insert mode completion.
  */
@@ -150,7 +149,11 @@
 				// word-wise expansion, not set for ^X^L
 # define CONT_LOCAL	32	// for ctrl_x_mode 0, ^X^P/^X^N do a local
 				// expansion, (eg use complete=.)
-#endif
+
+EXTERN char_u	*edit_submode INIT(= NULL); // msg for CTRL-X submode
+EXTERN char_u	*edit_submode_pre INIT(= NULL); // prepended to edit_submode
+EXTERN char_u	*edit_submode_extra INIT(= NULL);// appended to edit_submode
+EXTERN hlf_T	edit_submode_highl;	// highl. method for extra info
 
 /*
  * Functions for putting characters in the command line,
@@ -987,12 +990,6 @@
 					// to call u_sync()
 EXTERN int	ins_at_eol INIT(= FALSE); // put cursor after eol when
 					  // restarting edit after CTRL-O
-#ifdef FEAT_INS_EXPAND
-EXTERN char_u	*edit_submode INIT(= NULL); // msg for CTRL-X submode
-EXTERN char_u	*edit_submode_pre INIT(= NULL); // prepended to edit_submode
-EXTERN char_u	*edit_submode_extra INIT(= NULL);// appended to edit_submode
-EXTERN hlf_T	edit_submode_highl;	// highl. method for extra info
-#endif
 
 EXTERN int	no_abbr INIT(= TRUE);	// TRUE when no abbreviations loaded
 
@@ -1532,9 +1529,7 @@
 EXTERN char e_opendisp[]	INIT(= N_("E233: cannot open display"));
 #endif
 EXTERN char e_outofmem[]	INIT(= N_("E41: Out of memory!"));
-#ifdef FEAT_INS_EXPAND
-EXTERN char e_patnotf[]	INIT(= N_("Pattern not found"));
-#endif
+EXTERN char e_patnotf[]		INIT(= N_("Pattern not found"));
 EXTERN char e_patnotf2[]	INIT(= N_("E486: Pattern not found: %s"));
 EXTERN char e_positive[]	INIT(= N_("E487: Argument must be positive"));
 #if defined(UNIX) || defined(FEAT_SESSION)
@@ -1609,8 +1604,7 @@
 
 EXTERN char e_invalpat[]	INIT(= N_("E682: Invalid search pattern or delimiter"));
 EXTERN char e_bufloaded[]	INIT(= N_("E139: File is loaded in another buffer"));
-#if defined(FEAT_SYN_HL) || \
-	(defined(FEAT_INS_EXPAND) && defined(FEAT_COMPL_FUNC))
+#if defined(FEAT_SYN_HL) || defined(FEAT_COMPL_FUNC)
 EXTERN char e_notset[]	INIT(= N_("E764: Option '%s' is not set"));
 #endif
 #ifndef FEAT_CLIPBOARD
diff --git a/src/gui.c b/src/gui.c
index bb35f51..d9e7e47 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -4019,12 +4019,10 @@
     if (dont_scroll)
 	return;
 #endif
-#ifdef FEAT_INS_EXPAND
     /* Disallow scrolling the current window when the completion popup menu is
      * visible. */
     if ((sb->wp == NULL || sb->wp == curwin) && pum_visible())
 	return;
-#endif
 
 #ifdef FEAT_RIGHTLEFT
     if (sb->wp == NULL && curwin->w_p_rl)
@@ -4485,13 +4483,12 @@
     {
 	int type = VALID;
 
-#ifdef FEAT_INS_EXPAND
 	if (pum_visible())
 	{
 	    type = NOT_VALID;
 	    wp->w_lines_valid = 0;
 	}
-#endif
+
 	/* Don't set must_redraw here, it may cause the popup menu to
 	 * disappear when losing focus after a scrollbar drag. */
 	if (wp->w_redr_type < type)
@@ -4501,11 +4498,9 @@
 	mch_enable_flush();
     }
 
-#ifdef FEAT_INS_EXPAND
     /* May need to redraw the popup menu. */
     if (pum_visible())
 	pum_redraw();
-#endif
 
     return (wp == curwin && !EQUAL_POS(curwin->w_cursor, old_cursor));
 }
diff --git a/src/highlight.c b/src/highlight.c
index f32081d..8901994 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -140,10 +140,8 @@
     CENT("DiffText term=reverse cterm=bold ctermbg=Red",
 	 "DiffText term=reverse cterm=bold ctermbg=Red gui=bold guibg=Red"),
 #endif
-#ifdef FEAT_INS_EXPAND
     CENT("PmenuSbar ctermbg=Grey",
 	 "PmenuSbar ctermbg=Grey guibg=Grey"),
-#endif
     CENT("TabLineSel term=bold cterm=bold",
 	 "TabLineSel term=bold cterm=bold gui=bold"),
     CENT("TabLineFill term=reverse cterm=reverse",
@@ -181,14 +179,12 @@
     CENT("SpellLocal term=underline ctermbg=Cyan",
 	 "SpellLocal term=underline ctermbg=Cyan guisp=DarkCyan gui=undercurl"),
 #endif
-#ifdef FEAT_INS_EXPAND
     CENT("PmenuThumb ctermbg=Black",
 	 "PmenuThumb ctermbg=Black guibg=Black"),
     CENT("Pmenu ctermbg=LightMagenta ctermfg=Black",
 	 "Pmenu ctermbg=LightMagenta ctermfg=Black guibg=LightMagenta"),
     CENT("PmenuSel ctermbg=LightGrey ctermfg=Black",
 	 "PmenuSel ctermbg=LightGrey ctermfg=Black guibg=Grey"),
-#endif
     CENT("SpecialKey term=bold ctermfg=DarkBlue",
 	 "SpecialKey term=bold ctermfg=DarkBlue guifg=Blue"),
     CENT("Title term=bold ctermfg=DarkMagenta",
@@ -276,14 +272,12 @@
     CENT("SpellLocal term=underline ctermbg=Cyan",
 	 "SpellLocal term=underline ctermbg=Cyan guisp=Cyan gui=undercurl"),
 #endif
-#ifdef FEAT_INS_EXPAND
     CENT("PmenuThumb ctermbg=White",
 	 "PmenuThumb ctermbg=White guibg=White"),
     CENT("Pmenu ctermbg=Magenta ctermfg=Black",
 	 "Pmenu ctermbg=Magenta ctermfg=Black guibg=Magenta"),
     CENT("PmenuSel ctermbg=Black ctermfg=DarkGrey",
 	 "PmenuSel ctermbg=Black ctermfg=DarkGrey guibg=DarkGrey"),
-#endif
     CENT("Title term=bold ctermfg=LightMagenta",
 	 "Title term=bold ctermfg=LightMagenta gui=bold guifg=Magenta"),
     CENT("WarningMsg term=standout ctermfg=LightRed",
diff --git a/src/indent.c b/src/indent.c
index 2ae580a..b74864c 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -4110,7 +4110,6 @@
 	    {
 		int		match = FALSE;
 
-#ifdef FEAT_INS_EXPAND
 		if (keytyped == KEY_COMPLETE)
 		{
 		    char_u	*s;
@@ -4140,7 +4139,6 @@
 			match = TRUE;
 		}
 		else
-#endif
 		    // TODO: multi-byte
 		    if (keytyped == (int)p[-1] || (icase && keytyped < 256
 			 && TOLOWER_LOC(keytyped) == TOLOWER_LOC((int)p[-1])))
diff --git a/src/insexpand.c b/src/insexpand.c
index a86630f..280c2c6 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -13,7 +13,6 @@
 
 #include "vim.h"
 
-#ifdef FEAT_INS_EXPAND
 /*
  * Definitions used for CTRL-X submode.
  * Note: If you change CTRL-X submode, you must also maintain ctrl_x_msgs[] and
@@ -209,14 +208,12 @@
 static int  ins_compl_key2count(int c);
 static void show_pum(int prev_w_wrow, int prev_w_leftcol);
 static unsigned  quote_meta(char_u *dest, char_u *str, int len);
-#endif // FEAT_INS_EXPAND
 
 #ifdef FEAT_SPELL
 static void spell_back_to_badword(void);
 static int  spell_bad_len = 0;	// length of located bad word
 #endif
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * CTRL-X pressed in Insert mode.
  */
@@ -288,9 +285,9 @@
 has_compl_option(int dict_opt)
 {
     if (dict_opt ? (*curbuf->b_p_dict == NUL && *p_dict == NUL
-# ifdef FEAT_SPELL
+#ifdef FEAT_SPELL
 							&& !curwin->w_p_spell
-# endif
+#endif
 							)
 		 : (*curbuf->b_p_tsr == NUL && *p_tsr == NUL))
     {
@@ -4154,15 +4151,15 @@
     return m;
 }
 
-# if defined(EXITFREE) || defined(PROTO)
+#if defined(EXITFREE) || defined(PROTO)
     void
 free_insexpand_stuff(void)
 {
     VIM_CLEAR(compl_orig_text);
 }
-# endif
+#endif
 
-# ifdef FEAT_SPELL
+#ifdef FEAT_SPELL
 /*
  * Called when starting CTRL_X_SPELL mode: Move backwards to a previous badly
  * spelled word, if there is one.
@@ -4176,6 +4173,4 @@
     if (curwin->w_cursor.col != tpos.col)
 	start_arrow(&tpos);
 }
-# endif
-
-#endif // FEAT_INS_EXPAND
+#endif
diff --git a/src/misc2.c b/src/misc2.c
index 8cdd0d4..cf8b5df 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -1065,7 +1065,7 @@
     spell_free_all();
 # endif
 
-# if defined(FEAT_INS_EXPAND) && defined(FEAT_BEVAL_TERM)
+# if defined(FEAT_BEVAL_TERM)
     ui_remove_balloon();
 # endif
 
@@ -1117,9 +1117,7 @@
     free_search_patterns();
     free_old_sub();
     free_last_insert();
-# if defined(FEAT_INS_EXPAND)
     free_insexpand_stuff();
-# endif
     free_prev_shellcmd();
     free_regexp_stuff();
     free_tag_stuff();
diff --git a/src/move.c b/src/move.c
index 0df4fe5..b3475a8 100644
--- a/src/move.c
+++ b/src/move.c
@@ -136,10 +136,7 @@
 #endif
 		)
 	    && (wp->w_valid & VALID_CROW) == 0
-#ifdef FEAT_INS_EXPAND
-	    && !pum_visible()
-#endif
-	    )
+	    && !pum_visible())
     {
 	if (wp->w_p_rnu)
 	    // win_line() will redraw the number column only.
@@ -816,11 +813,7 @@
 	getvvcol(wp, &wp->w_cursor, NULL, &(wp->w_virtcol), NULL);
 	wp->w_valid |= VALID_VIRTCOL;
 #ifdef FEAT_SYN_HL
-	if (wp->w_p_cuc
-# ifdef FEAT_INS_EXPAND
-		&& !pum_visible()
-# endif
-		)
+	if (wp->w_p_cuc && !pum_visible())
 	    redraw_win_later(wp, SOME_VALID);
 #endif
     }
@@ -1179,10 +1172,7 @@
 #ifdef FEAT_SYN_HL
     /* Redraw when w_virtcol changes and 'cursorcolumn' is set */
     if (curwin->w_p_cuc && (curwin->w_valid & VALID_VIRTCOL) == 0
-# ifdef FEAT_INS_EXPAND
-	    && !pum_visible()
-# endif
-	)
+	    && !pum_visible())
 	redraw_later(SOME_VALID);
 #endif
 
@@ -1515,7 +1505,6 @@
 }
 #endif
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * Scroll the screen one line down, but don't do it if it would move the
  * cursor off the screen.
@@ -1634,7 +1623,6 @@
 	curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
     }
 }
-#endif /* FEAT_INS_EXPAND */
 
 /*
  * Add one line above "lp->lnum".  This can be a filler line, a closed fold or
diff --git a/src/option.c b/src/option.c
index 8d9b578..b625587 100644
--- a/src/option.c
+++ b/src/option.c
@@ -83,11 +83,9 @@
 #ifdef FEAT_COMMENTS
 # define PV_COM		OPT_BUF(BV_COM)
 #endif
-#ifdef FEAT_INS_EXPAND
-# define PV_CPT		OPT_BUF(BV_CPT)
-# define PV_DICT	OPT_BOTH(OPT_BUF(BV_DICT))
-# define PV_TSR		OPT_BOTH(OPT_BUF(BV_TSR))
-#endif
+#define PV_CPT		OPT_BUF(BV_CPT)
+#define PV_DICT	OPT_BOTH(OPT_BUF(BV_DICT))
+#define PV_TSR		OPT_BOTH(OPT_BUF(BV_TSR))
 #define PV_CSL		OPT_BUF(BV_CSL)
 #ifdef FEAT_COMPL_FUNC
 # define PV_CFU		OPT_BUF(BV_CFU)
@@ -301,9 +299,7 @@
 #ifdef FEAT_FOLDING
 static char_u	*p_cms;
 #endif
-#ifdef FEAT_INS_EXPAND
 static char_u	*p_cpt;
-#endif
 #ifdef FEAT_COMPL_FUNC
 static char_u	*p_cfu;
 static char_u	*p_ofu;
@@ -850,13 +846,8 @@
 			    (char_u *)&p_cp, PV_NONE,
 			    {(char_u *)TRUE, (char_u *)FALSE} SCTX_INIT},
     {"complete",    "cpt",  P_STRING|P_ALLOCED|P_VI_DEF|P_ONECOMMA|P_NODUP,
-#ifdef FEAT_INS_EXPAND
 			    (char_u *)&p_cpt, PV_CPT,
 			    {(char_u *)".,w,b,u,t,i", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"concealcursor","cocu", P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
 #ifdef FEAT_CONCEAL
@@ -885,13 +876,8 @@
 #endif
 			    SCTX_INIT},
     {"completeopt",   "cot",  P_STRING|P_VI_DEF|P_ONECOMMA|P_NODUP,
-#ifdef FEAT_INS_EXPAND
 			    (char_u *)&p_cot, PV_NONE,
 			    {(char_u *)"menu,preview", (char_u *)0L}
-#else
-			    (char_u *)NULL, PV_NONE,
-			    {(char_u *)0L, (char_u *)0L}
-#endif
 			    SCTX_INIT},
     {"completepopup", "cpp", P_STRING|P_VI_DEF|P_COMMA|P_NODUP,
 #if defined(FEAT_TEXT_PROP) && defined(FEAT_QUICKFIX)
@@ -903,7 +889,7 @@
 #endif
 			    SCTX_INIT},
     {"completeslash",   "csl",  P_STRING|P_VI_DEF|P_VIM,
-#if defined(FEAT_INS_EXPAND) && defined(BACKSLASH_IN_FILENAME)
+#if defined(BACKSLASH_IN_FILENAME)
 			    (char_u *)&p_csl, PV_CSL,
 			    {(char_u *)"", (char_u *)0L}
 #else
@@ -1023,11 +1009,7 @@
 			    (char_u *)&p_deco, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"dictionary",  "dict", P_STRING|P_EXPAND|P_VI_DEF|P_ONECOMMA|P_NODUP|P_NDNAME,
-#ifdef FEAT_INS_EXPAND
 			    (char_u *)&p_dict, PV_DICT,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)"", (char_u *)0L} SCTX_INIT},
     {"diff",	    NULL,   P_BOOL|P_VI_DEF|P_RWIN|P_NOGLOB,
 #ifdef FEAT_DIFF
@@ -2198,18 +2180,10 @@
 			    (char_u *)&p_prompt, PV_NONE,
 			    {(char_u *)TRUE, (char_u *)0L} SCTX_INIT},
     {"pumheight",   "ph",   P_NUM|P_VI_DEF,
-#ifdef FEAT_INS_EXPAND
 			    (char_u *)&p_ph, PV_NONE,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)0L, (char_u *)0L} SCTX_INIT},
     {"pumwidth",    "pw",   P_NUM|P_VI_DEF,
-#ifdef FEAT_INS_EXPAND
 			    (char_u *)&p_pw, PV_NONE,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)15L, (char_u *)15L} SCTX_INIT},
     {"pythonthreedll",  NULL,   P_STRING|P_EXPAND|P_VI_DEF|P_SECURE,
 #if defined(DYNAMIC_PYTHON3)
@@ -2796,11 +2770,7 @@
 			    (char_u *)&p_tw, PV_TW,
 			    {(char_u *)0L, (char_u *)0L} SCTX_INIT},
     {"thesaurus",   "tsr",  P_STRING|P_EXPAND|P_VI_DEF|P_ONECOMMA|P_NODUP|P_NDNAME,
-#ifdef FEAT_INS_EXPAND
 			    (char_u *)&p_tsr, PV_TSR,
-#else
-			    (char_u *)NULL, PV_NONE,
-#endif
 			    {(char_u *)"", (char_u *)0L} SCTX_INIT},
     {"tildeop",	    "top",  P_BOOL|P_VI_DEF|P_VIM,
 			    (char_u *)&p_to, PV_NONE,
@@ -3248,11 +3218,9 @@
 				NULL};
 static char *(p_fcl_values[]) = {"all", NULL};
 #endif
-#ifdef FEAT_INS_EXPAND
 static char *(p_cot_values[]) = {"menu", "menuone", "longest", "preview", "popup", "noinsert", "noselect", NULL};
-# ifdef BACKSLASH_IN_FILENAME
+#ifdef BACKSLASH_IN_FILENAME
 static char *(p_csl_values[]) = {"slash", "backslash", NULL};
-# endif
 #endif
 #ifdef FEAT_SIGNS
 static char *(p_scl_values[]) = {"yes", "no", "auto", "number", NULL};
@@ -5794,9 +5762,7 @@
 #if defined(FEAT_SMARTINDENT) || defined(FEAT_CINDENT)
     check_string_option(&buf->b_p_cinw);
 #endif
-#ifdef FEAT_INS_EXPAND
     check_string_option(&buf->b_p_cpt);
-#endif
 #ifdef FEAT_COMPL_FUNC
     check_string_option(&buf->b_p_cfu);
     check_string_option(&buf->b_p_ofu);
@@ -5816,10 +5782,8 @@
     check_string_option(&buf->b_p_path);
     check_string_option(&buf->b_p_tags);
     check_string_option(&buf->b_p_tc);
-#ifdef FEAT_INS_EXPAND
     check_string_option(&buf->b_p_dict);
     check_string_option(&buf->b_p_tsr);
-#endif
 #ifdef FEAT_LISP
     check_string_option(&buf->b_p_lw);
 #endif
@@ -7381,7 +7345,6 @@
     }
 #endif
 
-#ifdef FEAT_INS_EXPAND
     /* check if it is a valid value for 'complete' -- Acevedo */
     else if (gvarp == &p_cpt)
     {
@@ -7434,7 +7397,7 @@
 	    completeopt_was_set();
     }
 
-# ifdef BACKSLASH_IN_FILENAME
+#ifdef BACKSLASH_IN_FILENAME
     // 'completeslash'
     else if (gvarp == &p_csl)
     {
@@ -7442,8 +7405,7 @@
 		|| check_opt_strings(curbuf->b_p_csl, p_csl_values, FALSE) != OK)
 	    errmsg = e_invarg;
     }
-# endif
-#endif // FEAT_INS_EXPAND
+#endif
 
 #ifdef FEAT_SIGNS
     // 'signcolumn'
@@ -10959,14 +10921,12 @@
 	    clear_string_option(&buf->b_p_inc);
 	    break;
 #endif
-#ifdef FEAT_INS_EXPAND
 	case PV_DICT:
 	    clear_string_option(&buf->b_p_dict);
 	    break;
 	case PV_TSR:
 	    clear_string_option(&buf->b_p_tsr);
 	    break;
-#endif
 	case PV_FP:
 	    clear_string_option(&buf->b_p_fp);
 	    break;
@@ -11045,10 +11005,8 @@
 	    case PV_DEF:  return (char_u *)&(curbuf->b_p_def);
 	    case PV_INC:  return (char_u *)&(curbuf->b_p_inc);
 #endif
-#ifdef FEAT_INS_EXPAND
 	    case PV_DICT: return (char_u *)&(curbuf->b_p_dict);
 	    case PV_TSR:  return (char_u *)&(curbuf->b_p_tsr);
-#endif
 #if defined(FEAT_BEVAL) && defined(FEAT_EVAL)
 	    case PV_BEXPR: return (char_u *)&(curbuf->b_p_bexpr);
 #endif
@@ -11109,12 +11067,10 @@
 	case PV_INC:	return *curbuf->b_p_inc != NUL
 				    ? (char_u *)&(curbuf->b_p_inc) : p->var;
 #endif
-#ifdef FEAT_INS_EXPAND
 	case PV_DICT:	return *curbuf->b_p_dict != NUL
 				    ? (char_u *)&(curbuf->b_p_dict) : p->var;
 	case PV_TSR:	return *curbuf->b_p_tsr != NUL
 				    ? (char_u *)&(curbuf->b_p_tsr) : p->var;
-#endif
 	case PV_FP:	return *curbuf->b_p_fp != NUL
 				    ? (char_u *)&(curbuf->b_p_fp) : p->var;
 #ifdef FEAT_QUICKFIX
@@ -11229,11 +11185,9 @@
 #ifdef FEAT_FOLDING
 	case PV_CMS:	return (char_u *)&(curbuf->b_p_cms);
 #endif
-#ifdef FEAT_INS_EXPAND
 	case PV_CPT:	return (char_u *)&(curbuf->b_p_cpt);
-# ifdef BACKSLASH_IN_FILENAME
+#ifdef BACKSLASH_IN_FILENAME
 	case PV_CSL:	return (char_u *)&(curbuf->b_p_csl);
-# endif
 #endif
 #ifdef FEAT_COMPL_FUNC
 	case PV_CFU:	return (char_u *)&(curbuf->b_p_cfu);
@@ -11626,11 +11580,9 @@
 	    buf->b_p_ml_nobin = p_ml_nobin;
 	    buf->b_p_inf = p_inf;
 	    buf->b_p_swf = cmdmod.noswapfile ? FALSE : p_swf;
-#ifdef FEAT_INS_EXPAND
 	    buf->b_p_cpt = vim_strsave(p_cpt);
-# ifdef BACKSLASH_IN_FILENAME
+#ifdef BACKSLASH_IN_FILENAME
 	    buf->b_p_csl = vim_strsave(p_csl);
-# endif
 #endif
 #ifdef FEAT_COMPL_FUNC
 	    buf->b_p_cfu = vim_strsave(p_cfu);
@@ -11741,10 +11693,8 @@
 	    buf->b_p_inex = vim_strsave(p_inex);
 # endif
 #endif
-#ifdef FEAT_INS_EXPAND
 	    buf->b_p_dict = empty_option;
 	    buf->b_p_tsr = empty_option;
-#endif
 #ifdef FEAT_TEXTOBJ
 	    buf->b_p_qe = vim_strsave(p_qe);
 #endif
diff --git a/src/option.h b/src/option.h
index 0ccf8f1..c1a25b3 100644
--- a/src/option.h
+++ b/src/option.h
@@ -410,14 +410,12 @@
 EXTERN int	p_confirm;	// 'confirm'
 #endif
 EXTERN int	p_cp;		// 'compatible'
-#ifdef FEAT_INS_EXPAND
 EXTERN char_u	*p_cot;		// 'completeopt'
-# ifdef BACKSLASH_IN_FILENAME
+#ifdef BACKSLASH_IN_FILENAME
 EXTERN char_u	*p_csl;		// 'completeslash'
-# endif
+#endif
 EXTERN long	p_ph;		// 'pumheight'
 EXTERN long	p_pw;		// 'pumwidth'
-#endif
 EXTERN char_u	*p_cpo;		// 'cpoptions'
 #ifdef FEAT_CSCOPE
 EXTERN char_u	*p_csprg;	// 'cscopeprg'
@@ -443,9 +441,7 @@
 EXTERN char_u	*p_dex;		// 'diffexpr'
 # endif
 #endif
-#ifdef FEAT_INS_EXPAND
 EXTERN char_u	*p_dict;	// 'dictionary'
-#endif
 #ifdef FEAT_DIGRAPHS
 EXTERN int	p_dg;		// 'digraph'
 #endif
@@ -849,9 +845,7 @@
 EXTERN char_u	*p_titleold;	// 'titleold'
 EXTERN char_u	*p_titlestring;	// 'titlestring'
 #endif
-#ifdef FEAT_INS_EXPAND
 EXTERN char_u	*p_tsr;		// 'thesaurus'
-#endif
 EXTERN int	p_ttimeout;	// 'ttimeout'
 EXTERN long	p_ttm;		// 'ttimeoutlen'
 EXTERN int	p_tbi;		// 'ttybuiltin'
@@ -996,11 +990,9 @@
 #ifdef FEAT_COMMENTS
     , BV_COM
 #endif
-#ifdef FEAT_INS_EXPAND
     , BV_CPT
     , BV_DICT
     , BV_TSR
-#endif
 #ifdef BACKSLASH_IN_FILENAME
     , BV_CSL
 #endif
diff --git a/src/popupmnu.c b/src/popupmnu.c
index 467d670..929ab06 100644
--- a/src/popupmnu.c
+++ b/src/popupmnu.c
@@ -12,8 +12,6 @@
  */
 #include "vim.h"
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
-
 static pumitem_T *pum_array = NULL;	/* items of displayed pum */
 static int pum_size;			/* nr of items in "pum_array" */
 static int pum_selected;		/* index of selected item or -1 */
@@ -902,11 +900,11 @@
 	}
 #endif
     }
-# if defined(FEAT_TEXT_PROP) && defined(FEAT_QUICKFIX)
+#if defined(FEAT_TEXT_PROP) && defined(FEAT_QUICKFIX)
     if (!has_info)
 	// close any popup info window
 	popup_close_preview(TRUE);
-# endif
+#endif
 
     if (!resized)
 	pum_redraw();
@@ -924,7 +922,7 @@
     redraw_all_later(NOT_VALID);
     redraw_tabline = TRUE;
     status_redraw_all();
-# if defined(FEAT_TEXT_PROP) && defined(FEAT_QUICKFIX)
+#if defined(FEAT_TEXT_PROP) && defined(FEAT_QUICKFIX)
     // close any popup info window
     popup_close_preview(TRUE);
 #endif
@@ -1013,7 +1011,7 @@
     dict_add_special(dict, "scrollbar", pum_scrollbar ? VVAL_TRUE : VVAL_FALSE);
 }
 
-# if defined(FEAT_BEVAL_TERM) || defined(FEAT_TERM_POPUP_MENU) || defined(PROTO)
+#if defined(FEAT_BEVAL_TERM) || defined(FEAT_TERM_POPUP_MENU) || defined(PROTO)
     static void
 pum_position_at_mouse(int min_width)
 {
@@ -1051,14 +1049,14 @@
     pum_window = NULL;
 }
 
-# endif
+#endif
 
-# if defined(FEAT_BEVAL_TERM) || defined(PROTO)
+#if defined(FEAT_BEVAL_TERM) || defined(PROTO)
 static pumitem_T *balloon_array = NULL;
 static int balloon_arraysize;
 
-#define BALLOON_MIN_WIDTH 50
-#define BALLOON_MIN_HEIGHT 10
+# define BALLOON_MIN_WIDTH 50
+# define BALLOON_MIN_HEIGHT 10
 
 typedef struct {
     char_u	*start;
@@ -1275,9 +1273,9 @@
     // cell.
     ui_remove_balloon();
 }
-# endif
+#endif
 
-# if defined(FEAT_TERM_POPUP_MENU) || defined(PROTO)
+#if defined(FEAT_TERM_POPUP_MENU) || defined(PROTO)
 /*
  * Select the pum entry at the mouse position.
  */
@@ -1321,9 +1319,9 @@
     vimmenu_T   *mp;
     int		idx = 0;
     pumitem_T	*array;
-#ifdef FEAT_BEVAL_TERM
+# ifdef FEAT_BEVAL_TERM
     int		save_bevalterm = p_bevalterm;
-#endif
+# endif
     int		mode;
 
     pum_undisplay();
@@ -1361,10 +1359,10 @@
 
     pum_selected = -1;
     pum_first = 0;
-#  ifdef FEAT_BEVAL_TERM
+# ifdef FEAT_BEVAL_TERM
     p_bevalterm = TRUE;  /* track mouse movement */
     mch_setmouse(TRUE);
-#  endif
+# endif
 
     for (;;)
     {
@@ -1434,10 +1432,10 @@
 
     vim_free(array);
     pum_undisplay();
-#  ifdef FEAT_BEVAL_TERM
+# ifdef FEAT_BEVAL_TERM
     p_bevalterm = save_bevalterm;
     mch_setmouse(TRUE);
-#  endif
+# endif
 }
 
     void
@@ -1457,6 +1455,4 @@
     if (menu != NULL)
 	pum_show_popupmenu(menu);
 }
-# endif
-
 #endif
diff --git a/src/proto.h b/src/proto.h
index 02b9642..3b6d1ac 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -94,9 +94,7 @@
 # include "hashtab.pro"
 # include "highlight.pro"
 # include "indent.pro"
-# ifdef FEAT_INS_EXPAND
 # include "insexpand.pro"
-# endif
 # include "json.pro"
 # include "list.pro"
 # include "blob.pro"
diff --git a/src/screen.c b/src/screen.c
index cb2d07b..5043c0d 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -785,10 +785,8 @@
 #if defined(FEAT_SEARCH_EXTRA)
     end_search_hl();
 #endif
-#ifdef FEAT_INS_EXPAND
     /* May need to redraw the popup menu. */
     pum_may_redraw();
-#endif
 
     /* Reset b_mod_set flags.  Going through all windows is probably faster
      * than going through all buffers (there could be many buffers). */
@@ -6877,12 +6875,9 @@
 	redraw_cmdline = TRUE;
     }
     else if (!redrawing()
-#ifdef FEAT_INS_EXPAND
 	    // don't update status line when popup menu is visible and may be
 	    // drawn over it, unless it will be redrawn later
-	    || (!ignore_pum && pum_visible())
-#endif
-	    )
+	    || (!ignore_pum && pum_visible()))
     {
 	/* Don't redraw right now, do it later. */
 	wp->w_redr_status = TRUE;
@@ -7968,16 +7963,14 @@
     if (row >= screen_Rows || col >= screen_Columns)
 	return;
 
-#ifdef FEAT_INS_EXPAND
     // Skip if under the popup menu.
     // Popup windows with zindex higher than POPUPMENU_ZINDEX go on top.
     if (pum_under_menu(row, col)
-# ifdef FEAT_TEXT_PROP
+#ifdef FEAT_TEXT_PROP
 	    && screen_zindex <= POPUPMENU_ZINDEX
-# endif
+#endif
 	    )
 	return;
-#endif
 #ifdef FEAT_TEXT_PROP
     if (blocked_by_popup(row, col))
 	return;
@@ -9953,9 +9946,7 @@
     int		do_mode;
     int		attr;
     int		nwr_save;
-#ifdef FEAT_INS_EXPAND
     int		sub_attr;
-#endif
 
     do_mode = ((p_smd && msg_silent == 0)
 	    && ((State & INSERT)
@@ -10010,7 +10001,6 @@
 		}
 	    }
 #endif
-#ifdef FEAT_INS_EXPAND
 	    /* CTRL-X in Insert mode */
 	    if (edit_submode != NULL && !shortmess(SHM_COMPLETIONMENU))
 	    {
@@ -10041,7 +10031,6 @@
 		}
 	    }
 	    else
-#endif
 	    {
 		if (State & VREPLACE_FLAG)
 		    msg_puts_attr(_(" VREPLACE"), attr);
@@ -10106,10 +10095,7 @@
 	    need_clear = TRUE;
 	}
 	if (reg_recording != 0
-#ifdef FEAT_INS_EXPAND
-		&& edit_submode == NULL	    /* otherwise it gets too long */
-#endif
-		)
+		&& edit_submode == NULL)    // otherwise it gets too long
 	{
 	    recording_mode(attr);
 	    need_clear = TRUE;
@@ -10566,14 +10552,12 @@
 {
     if (!always && !redrawing())
 	return;
-#ifdef FEAT_INS_EXPAND
     if (pum_visible())
     {
 	/* Don't redraw right now, do it later. */
 	curwin->w_redr_status = TRUE;
 	return;
     }
-#endif
 #if defined(FEAT_STL_OPT)
     if ((*p_stl != NUL || *curwin->w_p_stl != NUL) && curwin->w_status_height)
 	redraw_custom_statusline(curwin);
@@ -10626,9 +10610,8 @@
     if (wp->w_cursor.lnum > wp->w_buffer->b_ml.ml_line_count)
 	return;
 
-#ifdef FEAT_INS_EXPAND
-    /* Don't draw the ruler while doing insert-completion, it might overwrite
-     * the (long) mode message. */
+    // Don't draw the ruler while doing insert-completion, it might overwrite
+    // the (long) mode message.
     if (wp == lastwin && lastwin->w_status_height == 0)
 	if (edit_submode != NULL)
 	    return;
@@ -10636,7 +10619,6 @@
     // Except when the popup menu will be redrawn anyway.
     if (!ignore_pum && pum_visible())
 	return;
-#endif
 
 #ifdef FEAT_STL_OPT
     if (*p_ruf)
diff --git a/src/search.c b/src/search.c
index 46273e1..9eb1925 100644
--- a/src/search.c
+++ b/src/search.c
@@ -399,10 +399,7 @@
     int		ic = ic_in;
 
     if (ic && !no_smartcase && scs
-#ifdef FEAT_INS_EXPAND
-			     && !(ctrl_x_mode_not_default() && curbuf->b_p_inf)
-#endif
-								    )
+			    && !(ctrl_x_mode_not_default() && curbuf->b_p_inf))
 	ic = !pat_has_uppercase(pat);
     no_smartcase = FALSE;
 
@@ -1614,7 +1611,6 @@
     return retval;
 }
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * search_for_exact_line(buf, pos, dir, pat)
  *
@@ -1693,7 +1689,6 @@
     }
     return FAIL;
 }
-#endif /* FEAT_INS_EXPAND */
 
 /*
  * Character Searches
@@ -5092,12 +5087,9 @@
 	return;
 
     if (type != CHECK_PATH && type != FIND_DEFINE
-#ifdef FEAT_INS_EXPAND
 	/* when CONT_SOL is set compare "ptr" with the beginning of the line
 	 * is faster than quote_meta/regcomp/regexec "ptr" -- Acevedo */
-	    && !(compl_cont_status & CONT_SOL)
-#endif
-       )
+	    && !(compl_cont_status & CONT_SOL))
     {
 	pat = alloc(len + 5);
 	if (pat == NULL)
@@ -5323,7 +5315,6 @@
 		    files[depth].name = curr_fname = new_fname;
 		    files[depth].lnum = 0;
 		    files[depth].matched = FALSE;
-#ifdef FEAT_INS_EXPAND
 		    if (action == ACTION_EXPAND)
 		    {
 			msg_hist_off = TRUE;	/* reset in msg_trunc_attr() */
@@ -5332,9 +5323,7 @@
 				(char *)new_fname);
 			msg_trunc_attr((char *)IObuff, TRUE, HL_ATTR(HLF_R));
 		    }
-		    else
-#endif
-			 if (p_verbose >= 5)
+		    else if (p_verbose >= 5)
 		    {
 			verbose_enter();
 			smsg(_("Searching included file %s"),
@@ -5373,11 +5362,7 @@
 	     */
 	    if (def_regmatch.regprog == NULL || define_matched)
 	    {
-		if (define_matched
-#ifdef FEAT_INS_EXPAND
-			|| (compl_cont_status & CONT_SOL)
-#endif
-		    )
+		if (define_matched || (compl_cont_status & CONT_SOL))
 		{
 		    /* compare the first "len" chars from "ptr" */
 		    startp = skipwhite(p);
@@ -5442,7 +5427,6 @@
 	}
 	if (matched)
 	{
-#ifdef FEAT_INS_EXPAND
 	    if (action == ACTION_EXPAND)
 	    {
 		int	cont_s_ipos = FALSE;
@@ -5524,9 +5508,7 @@
 		else if (add_r == FAIL)
 		    break;
 	    }
-	    else
-#endif
-		 if (action == ACTION_SHOW_ALL)
+	    else if (action == ACTION_SHOW_ALL)
 	    {
 		found = TRUE;
 		if (!did_show)
@@ -5638,29 +5620,21 @@
 #endif
 		break;
 	    }
-#ifdef FEAT_INS_EXPAND
 exit_matched:
-#endif
 	    matched = FALSE;
 	    /* look for other matches in the rest of the line if we
 	     * are not at the end of it already */
 	    if (def_regmatch.regprog == NULL
-#ifdef FEAT_INS_EXPAND
 		    && action == ACTION_EXPAND
 		    && !(compl_cont_status & CONT_SOL)
-#endif
 		    && *startp != NUL
 		    && *(p = startp + MB_PTR2LEN(startp)) != NUL)
 		goto search_line;
 	}
 	line_breakcheck();
-#ifdef FEAT_INS_EXPAND
 	if (action == ACTION_EXPAND)
 	    ins_compl_check_keys(30, FALSE);
 	if (got_int || ins_compl_interrupted())
-#else
-	if (got_int)
-#endif
 	    break;
 
 	/*
@@ -5721,17 +5695,9 @@
 		msg(_("No included files"));
 	}
     }
-    else if (!found
-#ifdef FEAT_INS_EXPAND
-		    && action != ACTION_EXPAND
-#endif
-						)
+    else if (!found && action != ACTION_EXPAND)
     {
-#ifdef FEAT_INS_EXPAND
 	if (got_int || ins_compl_interrupted())
-#else
-	if (got_int)
-#endif
 	    emsg(_(e_interr));
 	else if (type == FIND_DEFINE)
 	    emsg(_("E388: Couldn't find definition"));
diff --git a/src/spell.c b/src/spell.c
index cf2efe8..f6d7b2f 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -8763,7 +8763,6 @@
     return p;
 }
 
-#if defined(FEAT_INS_EXPAND) || defined(PROTO)
 /*
  * For Insert mode completion CTRL-X s:
  * Find start of the word in front of column "startcol".
@@ -8833,6 +8832,5 @@
     *matchp = ga.ga_data;
     return ga.ga_len;
 }
-#endif
 
 #endif  /* FEAT_SPELL */
diff --git a/src/structs.h b/src/structs.h
index 41f6036..15deda7 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2278,10 +2278,8 @@
 
     varnumber_T	b_last_changedtick; // b:changedtick when TextChanged or
 				    // TextChangedI was last triggered.
-#ifdef FEAT_INS_EXPAND
     varnumber_T	b_last_changedtick_pum; // b:changedtick when TextChangedP was
 					// last triggered.
-#endif
 
     int		b_saving;	// Set to TRUE if we are in the middle of
 				// saving the buffer.
@@ -2376,9 +2374,7 @@
     linenr_T	b_u_line_lnum;	// line number of line in u_line
     colnr_T	b_u_line_colnr;	// optional column number
 
-#ifdef FEAT_INS_EXPAND
     int		b_scanned;	// ^N/^P have scanned this buffer
-#endif
 
     // flags for use of ":lmap" and IM control
     long	b_p_iminsert;	// input mode for insert
@@ -2436,9 +2432,7 @@
 #ifdef FEAT_FOLDING
     char_u	*b_p_cms;	// 'commentstring'
 #endif
-#ifdef FEAT_INS_EXPAND
     char_u	*b_p_cpt;	// 'complete'
-#endif
 #ifdef BACKSLASH_IN_FILENAME
     char_u	*b_p_csl;	// 'completeslash'
 #endif
@@ -2545,10 +2539,8 @@
     char_u	*b_p_tags;	// 'tags' local value
     char_u	*b_p_tc;	// 'tagcase' local value
     unsigned	b_tc_flags;     // flags for 'tagcase'
-#ifdef FEAT_INS_EXPAND
     char_u	*b_p_dict;	// 'dictionary' local value
     char_u	*b_p_tsr;	// 'thesaurus' local value
-#endif
     long	b_p_ul;		// 'undolevels' local value
 #ifdef FEAT_PERSISTENT_UNDO
     int		b_p_udf;	// 'undofile'
diff --git a/src/tag.c b/src/tag.c
index 64b3057..284f2c1 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -1901,13 +1901,9 @@
 	    else
 #endif
 		fast_breakcheck();
-#ifdef FEAT_INS_EXPAND
 	    if ((flags & TAG_INS_COMP))	/* Double brackets for gcc */
 		ins_compl_check_keys(30, FALSE);
 	    if (got_int || ins_compl_interrupted())
-#else
-	    if (got_int)
-#endif
 	    {
 		stop_searching = TRUE;
 		break;
diff --git a/src/term.c b/src/term.c
index 028e6c2..e5a19b3 100644
--- a/src/term.c
+++ b/src/term.c
@@ -3505,13 +3505,11 @@
 	    else
 	    {
 		update_topline();
-#if defined(FEAT_INS_EXPAND)
 		if (pum_visible())
 		{
 		    redraw_later(NOT_VALID);
 		    ins_compl_show_pum();
 		}
-#endif
 		update_screen(NOT_VALID);
 		if (redrawing())
 		    setcursor();
diff --git a/src/userfunc.c b/src/userfunc.c
index 5abea1c..7366fc5 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -1614,9 +1614,7 @@
 		     * redo buffer.
 		     */
 		    save_search_patterns();
-#ifdef FEAT_INS_EXPAND
 		    if (!ins_compl_active())
-#endif
 		    {
 			saveRedobuff(&save_redo);
 			did_save_redo = TRUE;
diff --git a/src/version.c b/src/version.c
index 7dba139..b23da40 100644
--- a/src/version.c
+++ b/src/version.c
@@ -300,11 +300,7 @@
 #else
 	"-iconv",
 #endif
-#ifdef FEAT_INS_EXPAND
 	"+insert_expand",
-#else
-	"-insert_expand",
-#endif
 #ifdef FEAT_JOB_CHANNEL
 	"+job",
 #else
@@ -766,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1901,
+/**/
     1900,
 /**/
     1899,
diff --git a/src/vim.h b/src/vim.h
index 631a57d..4a86177 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -848,9 +848,7 @@
 #define ACTION_GOTO	2
 #define ACTION_SPLIT	3
 #define ACTION_SHOW_ALL	4
-#ifdef FEAT_INS_EXPAND
-# define ACTION_EXPAND	5
-#endif
+#define ACTION_EXPAND	5
 
 #ifdef FEAT_SYN_HL
 # define SST_MIN_ENTRIES 150	/* minimal size for state stack array */