diff --git a/src/testdir/Make_amiga.mak b/src/testdir/Make_amiga.mak
index 5128087..5f687b5 100644
--- a/src/testdir/Make_amiga.mak
+++ b/src/testdir/Make_amiga.mak
@@ -54,6 +54,7 @@
 		test_listlbr_utf8.out \
 		test_mapping.out \
 		test_marks.out \
+		test_match_conceal.out \
 		test_nested_function.out \
 		test_options.out \
 		test_perl.out \
@@ -205,6 +206,7 @@
 test_listlbr_utf8.out: test_listlbr_utf8.in
 test_mapping.out: test_mapping.in
 test_marks.out: test_marks.in
+test_match_conceal.out: test_match_conceal.in
 test_nested_function.out: test_nested_function.in
 test_options.out: test_options.in
 test_perl.out: test_perl.in
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 8c0169b..55c5220 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -53,6 +53,7 @@
 		test_listlbr_utf8.out \
 		test_mapping.out \
 		test_marks.out \
+		test_match_conceal.out \
 		test_nested_function.out \
 		test_options.out \
 		test_perl.out \
diff --git a/src/testdir/Make_ming.mak b/src/testdir/Make_ming.mak
index 2f00124..9faac68 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -75,6 +75,7 @@
 		test_listlbr_utf8.out \
 		test_mapping.out \
 		test_marks.out \
+		test_match_conceal.out \
 		test_nested_function.out \
 		test_options.out \
 		test_perl.out \
diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index 7277556..6ff7a6b 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -55,6 +55,7 @@
 		test_listlbr_utf8.out \
 		test_mapping.out \
 		test_marks.out \
+		test_match_conceal.out \
 		test_nested_function.out \
 		test_options.out \
 		test_perl.out \
diff --git a/src/testdir/Make_vms.mms b/src/testdir/Make_vms.mms
index 726c233..d8f54ad 100644
--- a/src/testdir/Make_vms.mms
+++ b/src/testdir/Make_vms.mms
@@ -114,6 +114,7 @@
 	 test_listlbr_utf8.out \
 	 test_mapping.out \
 	 test_marks.out \
+	 test_match_conceal.out \
 	 test_nested_function.out \
 	 test_options.out \
 	 test_perl.out \
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 4d5aea7..92bbe61 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -51,6 +51,7 @@
 		test_listlbr_utf8.out \
 		test_mapping.out \
 		test_marks.out \
+		test_match_conceal.out \
 		test_nested_function.out \
 		test_options.out \
 		test_perl.out \
diff --git a/src/testdir/test_match_conceal.in b/src/testdir/test_match_conceal.in
new file mode 100644
index 0000000..aa32b85
--- /dev/null
+++ b/src/testdir/test_match_conceal.in
@@ -0,0 +1,159 @@
+Test for matchadd() and conceal feature
+
+STARTTEST
+:so small.vim
+:if !has("conceal") | e! test.ok | w! test.out | qa! | endif
+:set term=ansi
+:so mbyte.vim
+:if &enc !=? 'utf-8'|:e! test.ok|:w! test.out|qa!|endif
+:10new|:vsp|:vert resize 20
+:put =\"\#\ This\ is\ a\ Test\"
+:norm! mazt
+:fu! ScreenChar(width, lines)
+:	let c=''
+:	for j in range(1,a:lines)
+:	    for i in range(1,a:width)
+:	    	let c.=nr2char(screenchar(j, i))
+:	    endfor
+:           let c.="\n"
+:	endfor
+:	return c
+:endfu
+:fu! ScreenAttr(line, pos, eval)
+:       let g:attr=[]
+:       for col in a:pos
+:	    call add(g:attr, screenattr(a:line,col))
+:	endfor
+:	" In case all values are zero, probably the terminal
+:       " isn't set correctly, so catch that case
+:	let null = (eval(join(g:attr, '+')) == 0)
+:       let str=substitute(a:eval, '\d\+', 'g:attr[&]', 'g')
+:	if null || eval(str)
+:	    :let g:attr_test="OK: ". str
+:	else
+:	    :let g:attr_test="FAILED: ".str
+:	    :let g:attr_test.="\n". join(g:attr, ' ')
+:	    :let g:attr_test.="\n TERM: ". &term
+:	endif
+:endfu
+:fu! DoRecordScreen()
+:	wincmd l
+:	$put =printf(\"\n%s\", g:test)
+:	$put =g:line
+:       $put =g:attr_test
+:	wincmd p
+:endfu
+:let g:test ="Test 1: simple addmatch()"
+:call matchadd('Conceal', '\%2l ')
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:
+:let g:test ="Test 2: simple addmatch() and conceal (should be: #XThisXisXaXTest)"
+:norm! 'azt
+:call clearmatches()
+:syntax on
+:set concealcursor=n conceallevel=1
+:call matchadd('Conceal', '\%2l ', 10, -1, {'conceal': 'X'})
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:
+:let g:test ="Test 3: addmatch() and conceallevel=3 (should be: #ThisisaTest)"
+:norm! 'azt
+:set conceallevel=3
+:call clearmatches()
+:call matchadd('Conceal', '\%2l ', 10, -1, {'conceal': 'X'})
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0==1 && 1==2 && 1==3 && 1==4 && 0!=5")
+:call DoRecordScreen()
+:
+:let g:test ="Test 4: more match() (should be: #Thisisa Test)"
+:norm! 'azt
+:call matchadd('ErrorMsg', '\%2l Test', 20, -1, {'conceal': 'X'})
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0==1 && 1==2 && 0!=3 && 3==4 && 0!=5 && 3!=5")
+:call DoRecordScreen()
+:
+:let g:test ="Test 5/1: default conceal char (should be: # This is a Test)"
+:norm! 'azt
+:call clearmatches()
+:set conceallevel=1
+:call matchadd('Conceal', '\%2l ', 10, -1, {})
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:let g:test ="Test 5/2: default conceal char (should be: #+This+is+a+Test)"
+:norm! 'azt
+:set listchars=conceal:+
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:set listchars&vim
+:
+:let g:test ="Test 6/1: syn and match conceal (should be: #ZThisZisZaZTest)"
+:norm! 'azt
+:call clearmatches()
+:set conceallevel=1
+:call matchadd('Conceal', '\%2l ', 10, -1, {'conceal': 'Z'})
+:syn match MyConceal /\%2l / conceal containedin=ALL cchar=*
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:let g:test ="Test 6/2: syn and match conceal (should be: #*This*is*a*Test)"
+:norm! 'azt
+:call clearmatches()
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:
+:let g:test ="Test 7/1: clear matches"
+:norm! 'azt
+:syn on
+:call matchadd('Conceal', '\%2l ', 10, -1, {'conceal': 'Z'})
+:let a=getmatches()
+:call clearmatches()
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0==1 && 0==2 && 0==3 && 0==4 && 0==5")
+:call DoRecordScreen()
+:$put =a
+:call setmatches(a)
+:norm! 'azt
+:let g:test ="Test 7/2: reset match using setmatches()"
+:norm! 'azt
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:
+:let g:test ="Test 8: using matchaddpos() (should be #Pis a Test"
+:norm! 'azt
+:call clearmatches()
+:call matchaddpos('Conceal', [[2,2,6]], 10, -1, {'conceal': 'P'})
+:let a=getmatches()
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1!=2 && 0==2 && 0==3 && 0!=4 && 0!=5 && 4==5")
+:call DoRecordScreen()
+:$put =a
+:
+:let g:test ="Test 9: match using multibyte conceal char (should be: #ˑThisˑisˑaˑTest)"
+:norm! 'azt
+:call clearmatches()
+:call matchadd('Conceal', '\%2l ', 20, -1, {'conceal': "\u02d1"})
+:redraw!
+:let line=ScreenChar(winwidth(0),1)
+:call ScreenAttr(1,[1,2,7,10,12,16], "0!=1 && 1==2 && 1==3 && 1==4 && 0==5")
+:call DoRecordScreen()
+:
+:"sleep 10
+:%w! test.out
+:qa!
+ENDTEST
+dummy text
diff --git a/src/testdir/test_match_conceal.ok b/src/testdir/test_match_conceal.ok
new file mode 100644
index 0000000..11c379e
--- /dev/null
+++ b/src/testdir/test_match_conceal.ok
@@ -0,0 +1,52 @@
+
+# This is a Test
+
+Test 1: simple addmatch()
+# This is a Test    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 2: simple addmatch() and conceal (should be: #XThisXisXaXTest)
+#XThisXisXaXTest    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 3: addmatch() and conceallevel=3 (should be: #ThisisaTest)
+#ThisisaTest        
+OK: g:attr[0]==g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]!=g:attr[5]
+
+Test 4: more match() (should be: #Thisisa Test)
+#Thisisa Test       
+OK: g:attr[0]==g:attr[1] && g:attr[1]==g:attr[2] && g:attr[0]!=g:attr[3] && g:attr[3]==g:attr[4] && g:attr[0]!=g:attr[5] && g:attr[3]!=g:attr[5]
+
+Test 5/1: default conceal char (should be: # This is a Test)
+# This is a Test    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 5/2: default conceal char (should be: #+This+is+a+Test)
+#+This+is+a+Test    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 6/1: syn and match conceal (should be: #ZThisZisZaZTest)
+#ZThisZisZaZTest    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 6/2: syn and match conceal (should be: #*This*is*a*Test)
+#*This*is*a*Test    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 7/1: clear matches
+# This is a Test    
+OK: g:attr[0]==g:attr[1] && g:attr[0]==g:attr[2] && g:attr[0]==g:attr[3] && g:attr[0]==g:attr[4] && g:attr[0]==g:attr[5]
+{'group': 'Conceal', 'pattern': '\%2l ', 'priority': 10, 'id': 10, 'conceal': 'Z'}
+
+Test 7/2: reset match using setmatches()
+#ZThisZisZaZTest    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]
+
+Test 8: using matchaddpos() (should be #Pis a Test
+#Pis a Test         
+OK: g:attr[0]!=g:attr[1] && g:attr[1]!=g:attr[2] && g:attr[0]==g:attr[2] && g:attr[0]==g:attr[3] && g:attr[0]!=g:attr[4] && g:attr[0]!=g:attr[5] && g:attr[4]==g:attr[5]
+{'group': 'Conceal', 'id': 11, 'priority': 10, 'pos1': [2, 2, 6], 'conceal': 'P'}
+
+Test 9: match using multibyte conceal char (should be: #ˑThisˑisˑaˑTest)
+#ˑThisˑisˑaˑTest    
+OK: g:attr[0]!=g:attr[1] && g:attr[1]==g:attr[2] && g:attr[1]==g:attr[3] && g:attr[1]==g:attr[4] && g:attr[0]==g:attr[5]