patch 8.1.0811: too many #ifdefsv8.1.0811

Problem:    Too many #ifdefs.
Solution:   Graduate FEAT_MBYTE, the final chapter.

54 files changed, 122 insertions, 325 deletions

diff --git a/src/appveyor.bat b/src/appveyor.bat
index 761f9b8908..f64a05ef2a 100644
--- a/src/appveyor.bat
+++ b/src/appveyor.bat
@@ -7,7 +7,7 @@ cd %APPVEYOR_BUILD_FOLDER%
 cd src
 echo "Building MinGW 32bit console version"
 set PATH=c:\msys64\mingw32\bin;%PATH%
-mingw32-make.exe -f Make_ming.mak GUI=no OPTIMIZE=speed IME=yes MBYTE=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
+mingw32-make.exe -f Make_ming.mak GUI=no OPTIMIZE=speed IME=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
 :: Save vim.exe before Make clean, moved back below.
 copy vim.exe testdir
 mingw32-make.exe -f Make_ming.mak clean
@@ -16,24 +16,24 @@ mingw32-make.exe -f Make_ming.mak clean
 :: with specified features without python.
 echo "Building MinGW 32bit GUI version"
 if "%FEATURE%" == "HUGE" (
-    mingw32-make.exe -f Make_ming.mak OPTIMIZE=speed CHANNEL=yes GUI=yes IME=yes MBYTE=yes ICONV=yes DEBUG=no PYTHON_VER=27 DYNAMIC_PYTHON=yes PYTHON=C:\Python27 PYTHON3_VER=35 DYNAMIC_PYTHON3=yes PYTHON3=C:\Python35 FEATURES=%FEATURE% || exit 1
+    mingw32-make.exe -f Make_ming.mak OPTIMIZE=speed CHANNEL=yes GUI=yes IME=yes ICONV=yes DEBUG=no PYTHON_VER=27 DYNAMIC_PYTHON=yes PYTHON=C:\Python27 PYTHON3_VER=35 DYNAMIC_PYTHON3=yes PYTHON3=C:\Python35 FEATURES=%FEATURE% || exit 1
 ) ELSE (
-    mingw32-make.exe -f Make_ming.mak OPTIMIZE=speed GUI=yes IME=yes MBYTE=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
+    mingw32-make.exe -f Make_ming.mak OPTIMIZE=speed GUI=yes IME=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
 )
 .\gvim -u NONE -c "redir @a | ver |0put a | wq" ver_ming.txt
 
 echo "Building MSVC 64bit console Version"
 sed -e "s/\$(LINKARGS2)/\$(LINKARGS2) | sed -e 's#.*\\\\r.*##'/" Make_mvc.mak > Make_mvc2.mak
-nmake -f Make_mvc2.mak CPU=AMD64 OLE=no GUI=no IME=yes MBYTE=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
+nmake -f Make_mvc2.mak CPU=AMD64 OLE=no GUI=no IME=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
 nmake -f Make_mvc2.mak clean
 
 :: build MSVC huge version with python and channel support
 :: GUI needs to be last, so that testing works
 echo "Building MSVC 64bit GUI Version"
 if "%FEATURE%" == "HUGE" (
-    nmake -f Make_mvc2.mak DIRECTX=yes CPU=AMD64 CHANNEL=yes OLE=no GUI=yes IME=yes MBYTE=yes ICONV=yes DEBUG=no PYTHON_VER=27 DYNAMIC_PYTHON=yes PYTHON=C:\Python27-x64 PYTHON3_VER=35 DYNAMIC_PYTHON3=yes PYTHON3=C:\Python35-x64 FEATURES=%FEATURE% || exit 1
+    nmake -f Make_mvc2.mak DIRECTX=yes CPU=AMD64 CHANNEL=yes OLE=no GUI=yes IME=yes ICONV=yes DEBUG=no PYTHON_VER=27 DYNAMIC_PYTHON=yes PYTHON=C:\Python27-x64 PYTHON3_VER=35 DYNAMIC_PYTHON3=yes PYTHON3=C:\Python35-x64 FEATURES=%FEATURE% || exit 1
 ) ELSE (
-    nmake -f Make_mvc2.mak CPU=AMD64 OLE=no GUI=yes IME=yes MBYTE=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
+    nmake -f Make_mvc2.mak CPU=AMD64 OLE=no GUI=yes IME=yes ICONV=yes DEBUG=no FEATURES=%FEATURE% || exit 1
 )
 .\gvim -u NONE -c "redir @a | ver |0put a | wq" ver_msvc.txt
 
diff --git a/src/auto/configure b/src/auto/configure
index 0431addf0f..a3302d2857 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -7937,10 +7937,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $enable_multibyte" >&5
 $as_echo "$enable_multibyte" >&6; }
-if test "$enable_multibyte" = "yes"; then
-  $as_echo "#define FEAT_MBYTE 1" >>confdefs.h
-
-else
+if test "$enable_multibyte" != "yes"; then
   as_fn_error $? "The multi-byte feature can no longer be disabled. If you have
 		a problem with this, discuss on the Vim mailing list." "$LINENO" 5
 fi
diff --git a/src/config.h.in b/src/config.h.in
index 9a7ba51efc..e13cc635f6 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -387,9 +387,6 @@
 /* Define if you want to include the Cscope interface. */
 #undef FEAT_CSCOPE
 
-/* Define if you want to include multibyte support. */
-#undef FEAT_MBYTE
-
 /* Define if you don't want to include right-left support. */
 #undef DISABLE_RIGHTLEFT
 
diff --git a/src/configure.ac b/src/configure.ac
index 2dcfe46cb3..e5525eaa63 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -2124,9 +2124,7 @@ AC_ARG_ENABLE(multibyte,
 	[  --enable-multibyte      Include multibyte editing support.], ,
 	[enable_multibyte="yes"])
 AC_MSG_RESULT($enable_multibyte)
-if test "$enable_multibyte" = "yes"; then
-  AC_DEFINE(FEAT_MBYTE)
-else
+if test "$enable_multibyte" != "yes"; then
   AC_MSG_ERROR([The multi-byte feature can no longer be disabled. If you have
 		a problem with this, discuss on the Vim mailing list.])
 fi
diff --git a/src/crypt_zip.c b/src/crypt_zip.c
index e50fa6b1c5..ed17d956b0 100644
--- a/src/crypt_zip.c
+++ b/src/crypt_zip.c
@@ -24,11 +24,7 @@
  */
 
 /* Need a type that should be 32 bits. 64 also works but wastes space. */
-# if VIM_SIZEOF_INT >= 4
 typedef unsigned int u32_T;	/* int is at least 32 bits */
-# else
-typedef unsigned long u32_T;	/* long should be 32 bits or more */
-# endif
 
 /* The state of encryption, referenced by cryptstate_T. */
 typedef struct {
diff --git a/src/feature.h b/src/feature.h
index 59fcf785e5..81b432db03 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -286,7 +286,7 @@
  *
  * Disabled for EBCDIC as it requires multibyte.
  */
-#if defined(FEAT_BIG) && !defined(DISABLE_ARABIC) && VIM_SIZEOF_INT >= 4 && !defined(EBCDIC)
+#if defined(FEAT_BIG) && !defined(DISABLE_ARABIC) && !defined(EBCDIC)
 # define FEAT_ARABIC
 #endif
 #ifdef FEAT_ARABIC
@@ -600,21 +600,14 @@
  * +multi_byte		Generic multi-byte character handling.
  *			Now always enabled.
  */
-#if !defined(FEAT_MBYTE)
-# define FEAT_MBYTE
-#endif
-#if VIM_SIZEOF_INT < 4 && !defined(PROTO)
-	Error: Vim only works with 32 bit int or larger
-#endif
 
 /* Define this if you want to use 16 bit Unicode only, reduces memory used for
  * the screen structures. */
 /* #define UNICODE16 */
 
 /*
- * +multi_byte_ime	Win32 IME input method.  Requires +multi_byte.
- *			Only for far-east Windows, so IME can be used to input
- *			chars.  Not tested much!
+ * +multi_byte_ime	Win32 IME input method.  Only for far-east Windows, so
+ *			IME can be used to input chars.  Not tested much!
  */
 #if defined(FEAT_GUI_W32) && !defined(FEAT_MBYTE_IME)
 /* #define FEAT_MBYTE_IME */
diff --git a/src/fileio.c b/src/fileio.c
index aa84e9bb48..4cb13f27a5 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -1178,10 +1178,9 @@ retry:
 	 */
 	if (!skip_read)
 	{
-#if VIM_SIZEOF_INT > 2
-# if defined(SSIZE_MAX) && (SSIZE_MAX < 0x10000L)
+#if defined(SSIZE_MAX) && (SSIZE_MAX < 0x10000L)
 		size = SSIZE_MAX;		    /* use max I/O size, 52K */
-# else
+#else
 		/* Use buffer >= 64K.  Add linerest to double the size if the
 		 * line gets very long, to avoid a lot of copying. But don't
 		 * read more than 1 Mbyte at a time, so we can be interrupted.
@@ -1189,20 +1188,11 @@ retry:
 		size = 0x10000L + linerest;
 		if (size > 0x100000L)
 		    size = 0x100000L;
-# endif
-#else
-		size = 0x7ff0L - linerest;	    /* limit buffer to 32K */
 #endif
 	}
 
 	/* Protect against the argument of lalloc() going negative. */
-	if (
-#if VIM_SIZEOF_INT <= 2
-	    linerest >= 0x7ff0
-#else
-	    size < 0 || size + linerest + 1 < 0 || linerest >= MAXCOL
-#endif
-	   )
+	if (size < 0 || size + linerest + 1 < 0 || linerest >= MAXCOL)
 	{
 	    ++split;
 	    *ptr = NL;		    /* split line by inserting a NL */
diff --git a/src/message.c b/src/message.c
index c5d48f229c..063fadae4a 100644
--- a/src/message.c
+++ b/src/message.c
@@ -4492,14 +4492,10 @@ vim_vsnprintf_typval(
 		    {
 			/* Don't put the #if inside memchr(), it can be a
 			 * macro. */
-# if VIM_SIZEOF_INT <= 2
-			char *q = memchr(str_arg, '\0', precision);
-# else
 			/* memchr on HP does not like n > 2^31  !!! */
 			char *q = memchr(str_arg, '\0',
 				  precision <= (size_t)0x7fffffffL ? precision
 						       : (size_t)0x7fffffffL);
-# endif
 			str_arg_l = (q == NULL) ? precision
 						      : (size_t)(q - str_arg);
 		    }
diff --git a/src/os_macosx.m b/src/os_macosx.m
index 50ca361fbb..3b5c35adb9 100644
--- a/src/os_macosx.m
+++ b/src/os_macosx.m
@@ -130,18 +130,14 @@ clip_mch_request_selection(VimClipboard *cbd)
     char_u *str = (char_u*)[string UTF8String];
     int len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
 
-#ifdef FEAT_MBYTE
     if (input_conv.vc_type != CONV_NONE)
 	str = string_convert(&input_conv, str, &len);
-#endif
 
     if (str)
 	clip_yank_selection(motion_type, str, len, cbd);
 
-#ifdef FEAT_MBYTE
     if (input_conv.vc_type != CONV_NONE)
 	vim_free(str);
-#endif
 
 releasepool:
     [pool release];
@@ -169,7 +165,6 @@ clip_mch_set_selection(VimClipboard *cbd)
 
     /* TODO: Avoid overflow. */
     int len = (int)llen;
-#ifdef FEAT_MBYTE
     if (output_conv.vc_type != CONV_NONE)
     {
 	char_u *conv_str = string_convert(&output_conv, str, &len);
@@ -179,7 +174,6 @@ clip_mch_set_selection(VimClipboard *cbd)
 	    str = conv_str;
 	}
     }
-#endif
 
     if (len > 0)
     {
diff --git a/src/spell.h b/src/spell.h
index 18c96446c2..085f18c216 100644
--- a/src/spell.h
+++ b/src/spell.h
@@ -38,11 +38,7 @@
 
 /* Type used for indexes in the word tree need to be at least 4 bytes.  If int
  * is 8 bytes we could use something smaller, but what? */
-#if VIM_SIZEOF_INT > 3
 typedef int idx_T;
-#else
-typedef long idx_T;
-#endif
 
 typedef int salfirst_T;
 
diff --git a/src/structs.h b/src/structs.h
index 3216c580cc..e25ae17386 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -416,12 +416,8 @@ struct u_header
 /*
  * structures used in undo.c
  */
-#if VIM_SIZEOF_INT > 2
-# define ALIGN_LONG	/* longword alignment and use filler byte */
-# define ALIGN_SIZE (sizeof(long))
-#else
-# define ALIGN_SIZE (sizeof(short))
-#endif
+#define ALIGN_LONG	/* longword alignment and use filler byte */
+#define ALIGN_SIZE (sizeof(long))
 
 #define ALIGN_MASK (ALIGN_SIZE - 1)
 
@@ -1229,19 +1225,11 @@ typedef unsigned long	    uvarnumber_T;
 # endif
 #else
 /* Use 32-bit Number. */
-# if VIM_SIZEOF_INT <= 3	/* use long if int is smaller than 32 bits */
-typedef long		    varnumber_T;
-typedef unsigned long	    uvarnumber_T;
-#define VARNUM_MIN	    LONG_MIN
-#define VARNUM_MAX	    LONG_MAX
-#define UVARNUM_MAX	    ULONG_MAX
-# else
 typedef int		    varnumber_T;
 typedef unsigned int	    uvarnumber_T;
 #define VARNUM_MIN	    INT_MIN
 #define VARNUM_MAX	    INT_MAX
 #define UVARNUM_MAX	    UINT_MAX
-# endif
 #endif
 
 typedef double	float_T;
diff --git a/src/testdir/runtest.vim b/src/testdir/runtest.vim
index a8b43aaed9..3f49ccb1cb 100644
--- a/src/testdir/runtest.vim
+++ b/src/testdir/runtest.vim
@@ -49,13 +49,9 @@ source setup.vim
 " This also enables use of line continuation.
 set nocp viminfo+=nviminfo
 
-" Use utf-8 or latin1 by default, instead of whatever the system default
-" happens to be.  Individual tests can overrule this at the top of the file.
-if has('multi_byte')
-  set encoding=utf-8
-else
-  set encoding=latin1
-endif
+" Use utf-8 by default, instead of whatever the system default happens to be.
+" Individual tests can overrule this at the top of the file.
+set encoding=utf-8
 
 " REDIR_TEST_TO_NULL has a very permissive SwapExists autocommand which is for
 " the test_name.vim file itself. Replace it here with a more restrictive one,
diff --git a/src/testdir/test_alot_utf8.vim b/src/testdir/test_alot_utf8.vim
index 648d806a94..be0bd01413 100644
--- a/src/testdir/test_alot_utf8.vim
+++ b/src/testdir/test_alot_utf8.vim
@@ -2,8 +2,7 @@
 " This makes testing go faster, since Vim doesn't need to restart.
 
 " These tests use utf8 'encoding'.  Setting 'encoding' is already done in
-" runtest.vim.  Checking for the multi_byte feature is in the individual
-" files, so that they can be run by themselves.
+" runtest.vim.
 
 source test_charsearch_utf8.vim
 source test_expr_utf8.vim
diff --git a/src/testdir/test_arabic.vim b/src/testdir/test_arabic.vim
index 17e925ee7f..bc31db7e7c 100644
--- a/src/testdir/test_arabic.vim
+++ b/src/testdir/test_arabic.vim
@@ -2,7 +2,7 @@
 " NOTE: This just checks if the code works. If you know Arabic please add
 " functional tests that check the shaping works with real text.
 
-if !has('arabic') || !has('multi_byte')
+if !has('arabic')
   finish
 endif
 
diff --git a/src/testdir/test_charsearch_utf8.vim b/src/testdir/test_charsearch_utf8.vim
index 399ac51c48..82a807ac5b 100644
--- a/src/testdir/test_charsearch_utf8.vim
+++ b/src/testdir/test_charsearch_utf8.vim
@@ -1,7 +1,4 @@
 " Tests for related f{char} and t{char} using utf-8.
-if !has('multi_byte')
-  finish
-endif
 
 " Test for t,f,F,T movement commands
 func Test_search_cmds()
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 9a4ccd11d5..4dcda858e8 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -582,7 +582,7 @@ func Test_setcmdpos()
 endfunc
 
 func Test_cmdline_overstrike()
-  let encodings = has('multi_byte') ? [ 'latin1', 'utf8' ] : [ 'latin1' ]
+  let encodings = ['latin1', 'utf8']
   let encoding_save = &encoding
 
   for e in encodings
@@ -601,11 +601,9 @@ func Test_cmdline_overstrike()
     call assert_equal('"ab0cd3ef4', @:)
   endfor
 
-  if has('multi_byte')
-    " Test overstrike with multi-byte characters.
-    call feedkeys(":\"テキストエディタ\<home>\<right>\<right>ab\<right>\<insert>cd\<enter>", 'xt')
-    call assert_equal('"テabキcdエディタ', @:)
-  endif
+  " Test overstrike with multi-byte characters.
+  call feedkeys(":\"テキストエディタ\<home>\<right>\<right>ab\<right>\<insert>cd\<enter>", 'xt')
+  call assert_equal('"テabキcdエディタ', @:)
 
   let &encoding = encoding_save
 endfunc
diff --git a/src/testdir/test_digraph.vim b/src/testdir/test_digraph.vim
index d5b0a7b72e..8d56a1a247 100644
--- a/src/testdir/test_digraph.vim
+++ b/src/testdir/test_digraph.vim
@@ -1,6 +1,6 @@
 " Tests for digraphs
 
-if !has("digraphs") || !has("multi_byte")
+if !has("digraphs")
   finish
 endif
 
@@ -466,9 +466,6 @@ func Test_show_digraph()
 endfunc
 
 func Test_show_digraph_cp1251()
-  if !has('multi_byte')
-    return
-  endif
   new
   set encoding=cp1251
   call Put_Dig("='")
diff --git a/src/testdir/test_display.vim b/src/testdir/test_display.vim
index e0e3e3b54c..81ffb2c944 100644
--- a/src/testdir/test_display.vim
+++ b/src/testdir/test_display.vim
@@ -39,7 +39,7 @@ func Test_display_foldcolumn()
 endfunc
 
 func Test_display_foldtext_mbyte()
-  if !has("folding") || !has("multi_byte")
+  if !has("folding")
     return
   endif
   call NewWindow(10, 40)
diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index 7b31469632..9a60d018e1 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -37,12 +37,10 @@ func Test_edit_01()
   call assert_equal([''], getline(1,'$'))
   %d
   " 4) delete a multibyte character
-  if has("multi_byte")
-    call setline(1, "\u0401")
-    call feedkeys("i\<del>\<esc>", 'tnix')
-    call assert_equal([''], getline(1,'$'))
-    %d
-  endif
+  call setline(1, "\u0401")
+  call feedkeys("i\<del>\<esc>", 'tnix')
+  call assert_equal([''], getline(1,'$'))
+  %d
   " 5.1) delete linebreak with 'bs' option containing eol
   let _bs=&bs
   set bs=eol
@@ -440,7 +438,7 @@ endfunc
 
 func Test_edit_CTRL_()
   " disabled for Windows builds, why?
-  if !has("multi_byte") || !has("rightleft") || has("win32")
+  if !has("rightleft") || has("win32")
     return
   endif
   let _encoding=&encoding
@@ -608,15 +606,14 @@ func Test_edit_CTRL_K()
   endtry
   call delete('Xdictionary.txt')
 
-  if has("multi_byte")
-    call test_override("char_avail", 1)
-    set showcmd
-    %d
-    call feedkeys("A\<c-k>a:\<esc>", 'tnix')
-    call assert_equal(['ä'], getline(1, '$'))
-    call test_override("char_avail", 0)
-    set noshowcmd
-  endif
+  call test_override("char_avail", 1)
+  set showcmd
+  %d
+  call feedkeys("A\<c-k>a:\<esc>", 'tnix')
+  call assert_equal(['ä'], getline(1, '$'))
+  call test_override("char_avail", 0)
+  set noshowcmd
+
   bw!
 endfunc
 
diff --git a/src/testdir/test_erasebackword.vim b/src/testdir/test_erasebackword.vim
index 098d6edfcb..9522ec2cd6 100644
--- a/src/testdir/test_erasebackword.vim
+++ b/src/testdir/test_erasebackword.vim
@@ -1,10 +1,5 @@
 
 func Test_erasebackword()
-  if !has('multi_byte')
-    return
-  endif
-
-  set encoding=utf-8
   enew
 
   exe "normal o wwwこんにちわ世界ワールドvim \<C-W>"
@@ -21,5 +16,4 @@ func Test_erasebackword()
   call assert_equal('', getline('.'))
 
   enew!
-  set encoding&
 endfunc
diff --git a/src/testdir/test_expr_utf8.vim b/src/testdir/test_expr_utf8.vim
index 1737a9f745..fad725d2e5 100644
--- a/src/testdir/test_expr_utf8.vim
+++ b/src/testdir/test_expr_utf8.vim
@@ -1,7 +1,4 @@
 " Tests for expressions using utf-8.
-if !has('multi_byte')
-  finish
-endif
 
 func Test_strgetchar()
   call assert_equal(char2nr('á'), strgetchar('áxb', 0))
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index d942d07687..3d8104817d 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -106,11 +106,9 @@ func Test_strwidth()
     call assert_equal(4, strwidth(1234))
     call assert_equal(5, strwidth(-1234))
 
-    if has('multi_byte')
-      call assert_equal(2, strwidth('😉'))
-      call assert_equal(17, strwidth('Eĥoŝanĝo ĉiuĵaŭde'))
-      call assert_equal((aw == 'single') ? 6 : 7, strwidth('Straße'))
-    endif
+    call assert_equal(2, strwidth('😉'))
+    call assert_equal(17, strwidth('Eĥoŝanĝo ĉiuĵaŭde'))
+    call assert_equal((aw == 'single') ? 6 : 7, strwidth('Straße'))
 
     call assert_fails('call strwidth({->0})', 'E729:')
     call assert_fails('call strwidth([])', 'E730:')
@@ -277,10 +275,8 @@ func Test_strpart()
   call assert_equal('fg', strpart('abcdefg', 5, 4))
   call assert_equal('defg', strpart('abcdefg', 3))
 
-  if has('multi_byte')
-    call assert_equal('lép', strpart('éléphant', 2, 4))
-    call assert_equal('léphant', strpart('éléphant', 2))
-  endif
+  call assert_equal('lép', strpart('éléphant', 2, 4))
+  call assert_equal('léphant', strpart('éléphant', 2))
 endfunc
 
 func Test_tolower()
@@ -290,10 +286,6 @@ func Test_tolower()
   call assert_equal(' !"#$%&''()*+,-./0123456789:;<=>?@abcdefghijklmnopqrstuvwxyz[\]^_`abcdefghijklmnopqrstuvwxyz{|}~',
           \ tolower(' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~'))
 
-  if !has('multi_byte')
-    return
-  endif
-
   " Test with a few uppercase diacritics.
   call assert_equal("aàáâãäåāăąǎǟǡả", tolower("AÀÁÂÃÄÅĀĂĄǍǞǠẢ"))
   call assert_equal("bḃḇ", tolower("BḂḆ"))
@@ -368,10 +360,6 @@ func Test_toupper()
   call assert_equal(' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`ABCDEFGHIJKLMNOPQRSTUVWXYZ{|}~',
           \ toupper(' !"#$%&''()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~'))
 
-  if !has('multi_byte')
-    return
-  endif
-
   " Test with a few lowercase diacritics.
   call assert_equal("AÀÁÂÃÄÅĀĂĄǍǞǠẢ", toupper("aàáâãäåāăąǎǟǡả"))
   call assert_equal("BḂḆ", toupper("bḃḇ"))
diff --git a/src/testdir/test_ga.vim b/src/testdir/test_ga.vim
index 6a7cba28f0..ea3d211aeb 100644
--- a/src/testdir/test_ga.vim
+++ b/src/testdir/test_ga.vim
@@ -21,10 +21,6 @@ func Test_ga_command()
 
   call assert_equal("\n<e>  101,  Hex 65,  Octal 145",   Do_ga('e'))
 
-  if !has('multi_byte')
-    return
-  endif
-
   " Test a few multi-bytes characters.
   call assert_equal("\n<é> 233, Hex 00e9, Oct 351, Digr e'",    Do_ga('é'))
   call assert_equal("\n<ẻ> 7867, Hex 1ebb, Oct 17273, Digr e2", Do_ga('ẻ'))
diff --git a/src/testdir/test_iminsert.vim b/src/testdir/test_iminsert.vim
index 142aec0bac..1a8e4c8a14 100644
--- a/src/testdir/test_iminsert.vim
+++ b/src/testdir/test_iminsert.vim
@@ -1,7 +1,3 @@
-if !has('multi_byte')
-  finish
-endif
-
 s