diff --git a/src/eval.c b/src/eval.c
index 26277fc..61d7df4 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -6128,6 +6128,7 @@
     /* Only do this once. */
     want_garbage_collect = FALSE;
     may_garbage_collect = FALSE;
+    garbage_collect_at_exit = FALSE;
 
     /*
      * 1. Go through all accessible variables and mark all lists and dicts
@@ -7110,7 +7111,7 @@
     {"foldtextresult",	1, 1, f_foldtextresult},
     {"foreground",	0, 0, f_foreground},
     {"function",	1, 1, f_function},
-    {"garbagecollect",	0, 0, f_garbagecollect},
+    {"garbagecollect",	0, 1, f_garbagecollect},
     {"get",		2, 3, f_get},
     {"getbufline",	2, 3, f_getbufline},
     {"getbufvar",	2, 2, f_getbufvar},
@@ -9719,6 +9720,9 @@
     /* This is postponed until we are back at the toplevel, because we may be
      * using Lists and Dicts internally.  E.g.: ":echo [garbagecollect()]". */
     want_garbage_collect = TRUE;
+
+    if (argvars[0].v_type != VAR_UNKNOWN && get_tv_number(&argvars[0]) == 1)
+	garbage_collect_at_exit = TRUE;
 }
 
 /*
diff --git a/src/globals.h b/src/globals.h
index ffb2050..ede2e2e 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -301,13 +301,17 @@
 #endif
 
 #ifdef FEAT_EVAL
-/* Garbage collection can only take place when we are sure there are no Lists
+/*
+ * Garbage collection can only take place when we are sure there are no Lists
  * or Dictionaries being used internally.  This is flagged with
  * "may_garbage_collect" when we are at the toplevel.
  * "want_garbage_collect" is set by the garbagecollect() function, which means
- * we do garbage collection before waiting for a char at the toplevel. */
+ * we do garbage collection before waiting for a char at the toplevel.
+ * "garbage_collect_at_exit" indicates garbagecollect(1) was called.
+ */
 EXTERN int	may_garbage_collect INIT(= FALSE);
 EXTERN int	want_garbage_collect INIT(= FALSE);
+EXTERN int	garbage_collect_at_exit INIT(= FALSE);
 
 /* ID of script being sourced or was sourced to define the current function. */
 EXTERN scid_T	current_SID INIT(= 0);
diff --git a/src/main.c b/src/main.c
index 906d8bd..6bd9ff4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1334,6 +1334,10 @@
 #ifdef FEAT_CSCOPE
     cs_end();
 #endif
+#ifdef FEAT_EVAL
+    if (garbage_collect_at_exit)
+	garbage_collect();
+#endif
 
     mch_exit(exitval);
 }
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 4053665..89a0ca9 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -6,7 +6,7 @@
 
 # Uncomment this line for using valgrind.
 # The output goes into a file "valgrind.$PID" (sorry, no test number).
-# VALGRIND = valgrind --tool=memcheck --num-callers=15 --logfile=valgrind
+# VALGRIND = valgrind --tool=memcheck --leak-check=yes --num-callers=15 --logfile=valgrind
 
 SCRIPTS = test1.out test2.out test3.out test4.out test5.out test6.out \
 		test7.out test8.out test9.out test10.out test11.out \
@@ -39,7 +39,7 @@
 $(SCRIPTS) $(SCRIPTS_GUI): $(VIMPROG)
 
 clean:
-	-rm -rf *.out *.failed *.rej *.orig test.log tiny.vim small.vim mbyte.vim test.ok X* viminfo
+	-rm -rf *.out *.failed *.rej *.orig test.log tiny.vim small.vim mbyte.vim test.ok X* valgrind.pid* viminfo
 
 test1.out: test1.in
 	-rm -f $*.failed tiny.vim small.vim mbyte.vim test.ok X* viminfo
@@ -66,5 +66,9 @@
 		fi"
 	-rm -rf X* test.ok viminfo
 
+test49.out: test49.vim
+
+test60.out: test60.vim
+
 nolog:
 	-echo Test results: >test.log
diff --git a/src/testdir/test14.in b/src/testdir/test14.in
index 57fb957..05c8025 100644
--- a/src/testdir/test14.in
+++ b/src/testdir/test14.in
@@ -18,6 +18,7 @@
 : let tt = "o\<C-V>65\<C-V>x42\<C-V>o103 \<C-V>33a\<C-V>xfg\<C-V>o78\<Esc>"
 :endif
 :exe "normal " . tt
+:unlet tt
 :.w >>test.out
 :set vb
 /^Piece
diff --git a/src/testdir/test26.in b/src/testdir/test26.in
index df572c8..e7cd757 100644
--- a/src/testdir/test26.in
+++ b/src/testdir/test26.in
@@ -37,6 +37,7 @@
 :    endif
 :  endif
 :endwhile
+:unlet i j
 :'t,$w! test.out
 :qa!
 ENDTEST
diff --git a/src/testdir/test34.in b/src/testdir/test34.in
index 4781fec..5eef715 100644
--- a/src/testdir/test34.in
+++ b/src/testdir/test34.in
@@ -52,7 +52,15 @@
 ---*---
 (one
 (two
-[(one again:$-5,$wq! test.out
+[(one again:$-5,$w! test.out
+:delfunc Table
+:delfunc Compute
+:delfunc Expr1
+:delfunc Expr2
+:delfunc ListItem
+:delfunc ListReset
+:unlet retval counter
+:q!
 ENDTEST
 
 here
diff --git a/src/testdir/test45.in b/src/testdir/test45.in
index 58537f3..cc99149 100644
--- a/src/testdir/test45.in
+++ b/src/testdir/test45.in
@@ -55,6 +55,7 @@
 /kk$
 :call append("$", foldlevel("."))
 :/^last/+1,$w! test.out
+:delfun Flvl
 :qa!
 ENDTEST
 
diff --git a/src/testdir/test47.in b/src/testdir/test47.in
index 35bb9f2..d8384de 100644
--- a/src/testdir/test47.in
+++ b/src/testdir/test47.in
@@ -34,6 +34,7 @@
 :call append("$", two)
 :call append("$", three)
 :$-2,$w! test.out
+:unlet one two three
 :qa!
 ENDTEST
 
diff --git a/src/testdir/test49.in b/src/testdir/test49.in
index ec17d21..22191b2 100644
--- a/src/testdir/test49.in
+++ b/src/testdir/test49.in
@@ -1,13 +1,29 @@
 This is a test of the script language.
 
 If after adding a new test, the test output doesn't appear properly in
-test49.failed, try to add one ore more "G"s at the line before ENDTEST.
+test49.failed, try to add one ore more "G"s at the line ending in "test.out"
 
 STARTTEST
 :so small.vim
 :se nocp nomore viminfo+=nviminfo
 :so test49.vim
-GGGGGGGGGG"rp:.-,$wq! test.out
+GGGGGGGGGGGGGG"rp:.-,$w! test.out
+:"
+:" make valgrind happy
+:redir => funclist
+:silent func
+:redir END
+:for line in split(funclist, "\n")
+:  let name = matchstr(line, 'function \zs[A-Z]\w*\ze(')
+:  if name != ''
+:    exe "delfunc " . name
+:  endif
+:endfor
+:for v in keys(g:)
+:  silent! exe "unlet " . v
+:endfor
+:unlet v
+:qa!
 ENDTEST
 
 Results of test49.vim:
diff --git a/src/testdir/test55.in b/src/testdir/test55.in
index b20c6c4..2243762 100644
--- a/src/testdir/test55.in
+++ b/src/testdir/test55.in
@@ -345,6 +345,10 @@
 :endfun
 :call Test(1, 2, [3, 4], {5: 6})  " This may take a while
 :"
+:delfunc Test
+:unlet dict
+:call garbagecollect(1)
+:"
 :/^start:/,$wq! test.out
 ENDTEST
 
diff --git a/src/testdir/test56.in b/src/testdir/test56.in
index 67d66af..311a600 100644
--- a/src/testdir/test56.in
+++ b/src/testdir/test56.in
@@ -17,5 +17,5 @@
 fun s:DoNothing()
   call append(line('$'), "nothing line")
 endfun
-nnoremap <buffer> _x	:call <SID>DoNothing()<bar>call <SID>DoLast()<cr>
+nnoremap <buffer> _x	:call <SID>DoNothing()<bar>call <SID>DoLast()<bar>delfunc <SID>DoNothing<bar>delfunc <SID>DoLast<cr>
 end:
diff --git a/src/testdir/test58.in b/src/testdir/test58.in
index 467c7b5..9600e83 100644
--- a/src/testdir/test58.in
+++ b/src/testdir/test58.in
@@ -86,6 +86,7 @@
 :$put =str
 `m]s:let [str, a] = spellbadword()
 :$put =str
+:unlet str a
 :"
 :" Postponed prefixes
 :call TestOne('2', '1')
@@ -100,6 +101,10 @@
 :" NOSLITSUGS
 :call TestOne('8', '8')
 :"
+:" clean up for valgrind
+:delfunc TestOne
+:set spl= enc=latin1
+:"
 gg:/^test output:/,$wq! test.out
 ENDTEST
 
diff --git a/src/testdir/test59.in b/src/testdir/test59.in
index bd63796..dcdb62b 100644
--- a/src/testdir/test59.in
+++ b/src/testdir/test59.in
@@ -90,6 +90,7 @@
 :$put =str
 `m]s:let [str, a] = spellbadword()
 :$put =str
+:unlet str a
 :"
 :" Postponed prefixes
 :call TestOne('2', '1')
@@ -101,6 +102,10 @@
 :call TestOne('6', '6')
 :call TestOne('7', '7')
 :"
+:" clean up for valgrind
+:delfunc TestOne
+:set spl= enc=latin1
+:"
 gg:/^test output:/,$wq! test.out
 ENDTEST
 
diff --git a/src/testdir/test60.in b/src/testdir/test60.in
index d5a0d7c..3a5b73e 100644
--- a/src/testdir/test60.in
+++ b/src/testdir/test60.in
@@ -569,6 +569,9 @@
     redir END
 endfunction
 :call TestExists()
+:delfunc TestExists
+:delfunc RunTest
+:delfunc TestFuncArg
 :edit! test.out
 :set ff=unix
 :w
diff --git a/src/testdir/test60.vim b/src/testdir/test60.vim
index 48eea42..f1157f7 100644
--- a/src/testdir/test60.vim
+++ b/src/testdir/test60.vim
@@ -94,4 +94,5 @@
 else
     echo "FAILED"
 endif
+unlet str
 
diff --git a/src/testdir/test62.in b/src/testdir/test62.in
index e507c6a..83def27 100644
--- a/src/testdir/test62.in
+++ b/src/testdir/test62.in
@@ -7,6 +7,7 @@
 :let nr = tabpagenr()
 :q
 :call append(line('$'), 'tab page ' . nr)
+:unlet nr
 :"
 :" Open three tab pages and use ":tabdo"
 :0tabnew
@@ -23,6 +24,7 @@
 :q!
 :call append(line('$'), line1)
 :call append(line('$'), line2)
+:unlet line1 line2
 :"
 :"
 :/^Results/,$w! test.out
diff --git a/src/testdir/test63.in b/src/testdir/test63.in
index 1095611..74339c3 100644
--- a/src/testdir/test63.in
+++ b/src/testdir/test63.in
@@ -60,7 +60,7 @@
 :else
 :  let @r .= "FAILED\n"
 :endif
-:" --- Check that "matchdelete()" returns 0 if succesfull and otherwise -1.
+:" --- Check that "matchdelete()" returns 0 if successful and otherwise -1.
 :let @r .= "*** Test 6: "
 :let m = matchadd("MyGroup1", "TODO")
 :let r1 = matchdelete(m)
@@ -117,7 +117,7 @@
 :" --- Check that "setmatches()" will not add two matches with the same ID. The
 :" --- expected behaviour (for now) is to add the first match but not the
 :" --- second and to return 0 (even though it is a matter of debate whether
-:" --- this can be considered succesfull behaviour).
+:" --- this can be considered successful behaviour).
 :let @r .= "*** Test 9: "
 :let r1 = setmatches([{'group': 'MyGroup1', 'pattern': 'TODO', 'priority': 10, 'id': 1}, {'group': 'MyGroup2', 'pattern': 'FIXME', 'priority': 10, 'id': 1}])
 :if getmatches() == [{'group': 'MyGroup1', 'pattern': 'TODO', 'priority': 10, 'id': 1}] && r1 == 0
@@ -127,7 +127,7 @@
 :endif
 :call clearmatches()
 :unlet r1
-:" --- Check that "setmatches()" returns 0 if succesfull and otherwise -1.
+:" --- Check that "setmatches()" returns 0 if successful and otherwise -1.
 :" --- (A range of valid and invalid input values are tried out to generate the
 :" --- return values.)
 :let @r .= "*** Test 10: "
diff --git a/src/testdir/test64.in b/src/testdir/test64.in
index aa931db..6e953e0 100644
--- a/src/testdir/test64.in
+++ b/src/testdir/test64.in
@@ -44,8 +44,10 @@
 :        $put ='ERROR: pat: \"' . t[0] . '\", text: \"' . t[1] . '\", submatch ' . i . ': \"' . l[i] . '\", expected: \"' . e . '\"'
 :      endif
 :    endfor
+:    unlet i
 :  endif
 :endfor
+:unlet t tl e l
 :/^Results/,$wq! test.out
 ENDTEST
 
diff --git a/src/version.c b/src/version.c
index 343ae3d..0f90b8b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -667,6 +667,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    120,
+/**/
     119,
 /**/
     118,