diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index c200a2f..29f8b86 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -29,7 +29,7 @@
 		test42.out test52.out test65.out test66.out test67.out \
 		test68.out test69.out
 
-SCRIPTS32 =	test50.out
+SCRIPTS32 =	test50.out test70.out
 
 SCRIPTS_GUI = test16.out
 
diff --git a/src/testdir/Make_ming.mak b/src/testdir/Make_ming.mak
index 26d1e87..760bb21 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -48,7 +48,7 @@
 		test42.out test52.out test65.out test66.out test67.out \
 		test68.out test69.out
 
-SCRIPTS32 =	test50.out
+SCRIPTS32 =	test50.out test70.out
 
 SCRIPTS_GUI = test16.out
 
@@ -78,6 +78,7 @@
 	-$(DEL) small.vim
 	-$(DEL) tiny.vim
 	-$(DEL) mbyte.vim
+	-$(DEL) mzscheme.vim
 	-$(DEL) X*
 	-$(DEL) viminfo
 
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index efad475..073a284 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -23,7 +23,7 @@
 		test54.out test55.out test56.out test57.out test58.out \
 		test59.out test60.out test61.out test62.out test63.out \
 		test64.out test65.out test66.out test67.out test68.out \
-		test69.out
+		test69.out test70.out
 
 SCRIPTS_GUI = test16.out
 
@@ -44,10 +44,10 @@
 $(SCRIPTS) $(SCRIPTS_GUI): $(VIMPROG)
 
 clean:
-	-rm -rf *.out *.failed *.rej *.orig test.log tiny.vim small.vim mbyte.vim test.ok X* valgrind.pid* viminfo
+	-rm -rf *.out *.failed *.rej *.orig test.log tiny.vim small.vim mbyte.vim mzscheme.vim test.ok X* valgrind.pid* viminfo
 
 test1.out: test1.in
-	-rm -f $*.failed tiny.vim small.vim mbyte.vim test.ok X* viminfo
+	-rm -f $*.failed tiny.vim small.vim mbyte.vim mzscheme.vim test.ok X* viminfo
 	$(VALGRIND) $(VIMPROG) -u unix.vim -U NONE --noplugin -s dotest.in $*.in
 	@/bin/sh -c "if diff test.out $*.ok; \
 		then mv -f test.out $*.out; \
diff --git a/src/testdir/main.aap b/src/testdir/main.aap
index 0293b92..5fb93ec 100644
--- a/src/testdir/main.aap
+++ b/src/testdir/main.aap
@@ -32,11 +32,11 @@
 $Scripts $ScriptsGUI: $VimProg
 
 clean:
-	:del {r}{force} *.out test.log tiny.vim small.vim mbyte.vim test.ok X*
+	:del {r}{force} *.out test.log tiny.vim small.vim mbyte.vim mzscheme.vim test.ok X*
 
 # test1 is special, it checks for features
 test1.out: test1.in
-	:del {force} test1.failed tiny.vim small.vim mbyte.vim
+	:del {force} test1.failed tiny.vim small.vim mbyte.vim mzscheme.vim
 	:sys {i} $VimProg -u unix.vim -U NONE --noplugin -s dotest.in test1.in
 	@if os.system("diff test.out test1.ok") != 0:
 		:error test1 FAILED - Something basic is wrong
diff --git a/src/testdir/test1.in b/src/testdir/test1.in
index 6d1bdde..bdcc01d 100644
--- a/src/testdir/test1.in
+++ b/src/testdir/test1.in
@@ -13,6 +13,7 @@
 
 If Vim was not compiled with the +multi_byte feature, the mbyte.vim script will be set like small.vim above.  mbyte.vim is sourced by tests that require the
 +multi_byte feature.
+Similar logic is applied to the +mzscheme feature, using mzscheme.vim.
 
 STARTTEST
 :" Write a single line to test.out to check if testing works at all.
@@ -25,8 +26,11 @@
 w! test.out
 qa!
 :w! mbyte.vim
+:w! mzscheme.vim
 :" If +multi_byte feature supported, make mbyte.vim empty.
 :if has("multi_byte") | sp another | w! mbyte.vim | q | endif
+:" If +mzscheme feature supported, make mzscheme.vim empty.
+:if has("mzscheme") | sp another | w! mzscheme.vim | q | endif
 :" If +eval feature supported quit here, leaving tiny.vim and small.vim empty.
 :" Otherwise write small.vim to skip the test.
 :if 1 | q! | endif
diff --git a/src/testdir/test70.in b/src/testdir/test70.in
new file mode 100644
index 0000000..01f43ea
--- /dev/null
+++ b/src/testdir/test70.in
@@ -0,0 +1,53 @@
+Smoke test for MzScheme interface and mzeval() function
+
+STARTTEST
+:so mzscheme.vim
+:set nocompatible viminfo+=nviminfo
+:function! MzRequire()
+:redir => l:mzversion
+:mz (version)
+:redir END
+:if strpart(l:mzversion, 1, 1) < "4"
+:" MzScheme versions < 4.x:
+:mz (require (prefix vim- vimext))
+:else
+:" newer versions:
+:mz (require (prefix-in vim- 'vimext))
+:mz (require r5rs)
+:endif
+:endfunction
+:silent call MzRequire()
+:mz (define l '("item0" "dictionary with list OK" "item2"))
+:mz (define h (make-hash))
+:mz (hash-set! h "list" l)
+/^1
+:" change buffer contents
+:mz (vim-set-buff-line (vim-eval "line('.')") "1 changed line 1")
+:" scalar test
+:let tmp_string = mzeval('"string"')
+:let tmp_1000 = mzeval('1000')
+:if tmp_string . tmp_1000 == "string1000"
+:let scalar_res = "OK"
+:else
+:let scalar_res = "FAILED"
+:endif
+:call append(search("^1"), "scalar test " . scalar_res)
+:" dictionary containing a list
+:let tmp = mzeval("h")["list"][1]
+:/^2/put =tmp
+:" circular list (at the same time test lists containing lists)
+:mz (set-car! (cddr l) l)
+:let l2 = mzeval("h")["list"]
+:if l2[2] == l2
+:let res = "OK"
+:else
+:let res = "FAILED"
+:endif
+:call setline(search("^3"), "circular test " . res)
+:?^1?,$w! test.out
+:qa!
+ENDTEST
+
+1 line 1
+2 line 2
+3 line 3
diff --git a/src/testdir/test70.ok b/src/testdir/test70.ok
new file mode 100644
index 0000000..f8d2d31
--- /dev/null
+++ b/src/testdir/test70.ok
@@ -0,0 +1,5 @@
+1 changed line 1
+scalar test OK
+2 line 2
+dictionary with list OK
+circular test OK