diff --git a/src/Makefile b/src/Makefile
index 704721b..c32ea08 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2301,7 +2301,7 @@
 #	export TEST_FILTER=Test_terminal_wipe_buffer
 # A partial match also works:
 #	export TEST_FILTER=wipe_buffer
-$(NEW_TESTS):
+$(NEW_TESTS) test_vim9:
 	cd testdir; $(MAKE) $@ VIMPROG=../$(VIMTESTTARGET) $(GUI_TESTARG) SCRIPTSOURCE=../$(SCRIPTSOURCE)
 
 newtests:
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 8ca7831..63d97e8 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -43,6 +43,19 @@
 # Tests for the GUI.
 SCRIPTS_GUI =
 
+# Tests for Vim9 script.
+TEST_VIM9 = \
+	test_vim9_disassemble \
+	test_vim9_expr \
+	test_vim9_func \
+	test_vim9_script
+
+TEST_VIM9_RES = \
+	test_vim9_disassemble.res \
+	test_vim9_expr.res \
+	test_vim9_func.res \
+	test_vim9_script.res
+
 # Individual tests, including the ones part of test_alot.
 # Please keep sorted up to test_alot.
 NEW_TESTS = \
@@ -272,10 +285,7 @@
 	test_utf8 \
 	test_utf8_comparisons \
 	test_vartabs \
-	test_vim9_disassemble \
-	test_vim9_expr \
-	test_vim9_func \
-	test_vim9_script \
+	$(TEST_VIM9) \
 	test_viminfo \
 	test_vimscript \
 	test_virtualedit \
@@ -482,10 +492,7 @@
 	test_user_func.res \
 	test_usercommands.res \
 	test_vartabs.res \
-	test_vim9_disassemble.res \
-	test_vim9_expr.res \
-	test_vim9_func.res \
-	test_vim9_script.res \
+	$(TEST_VIM9_RES) \
 	test_viminfo.res \
 	test_vimscript.res \
 	test_virtualedit.res \
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 746c849..b2eaecb 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -79,6 +79,16 @@
 		exit 1; \
 	fi
 
+# Run only tests specific for Vim9 script
+test_vim9:
+	rm -f test_vim9_*.res test.log messages
+	@MAKEFLAGS=--no-print-directory $(MAKE) -f Makefile $(TEST_VIM9_RES) VIMPROG=$(VIMPROG) XXDPROG=$(XXDPROG) SCRIPTSOURCE=$(SCRIPTSOURCE)
+	@cat messages
+	@MAKEFLAGS=--no-print-directory $(MAKE) -f Makefile report VIMPROG=$(VIMPROG) XXDPROG=$(XXDPROG) SCRIPTSOURCE=$(SCRIPTSOURCE)
+	@if test -f test.log; then \
+		exit 1; \
+	fi
+
 RM_ON_RUN = test.out X* viminfo
 RM_ON_START = tiny.vim small.vim mbyte.vim mzscheme.vim test.ok benchmark.out
 RUN_VIM = VIMRUNTIME=$(SCRIPTSOURCE) $(VALGRIND) $(VIMPROG) -f $(GUI_FLAG) -u unix.vim $(NO_INITS) -s dotest.in
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 5554b2d..fb2180f 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -373,6 +373,11 @@
   return 1234
 enddef
 
+def FuncNoArgRetString(): string
+  funcResult = 45
+  return 'text'
+enddef
+
 def FuncOneArgNoRet(arg: number)
   funcResult = arg
 enddef
@@ -382,6 +387,10 @@
   return arg
 enddef
 
+def FuncOneArgRetString(arg: string): string
+  return arg
+enddef
+
 def FuncOneArgRetAny(arg: any): any
   return arg
 enddef
@@ -415,6 +424,32 @@
   assert_equal(13, funcResult)
 enddef
 
+def Test_func_type_part()
+  let RefVoid: func: void
+  RefVoid = FuncNoArgNoRet
+  RefVoid = FuncOneArgNoRet
+  CheckDefFailure(['let RefVoid: func: void', 'RefVoid = FuncNoArgRetNumber'], 'E1013: type mismatch, expected func() but got func(): number')
+  CheckDefFailure(['let RefVoid: func: void', 'RefVoid = FuncNoArgRetString'], 'E1013: type mismatch, expected func() but got func(): string')
+
+  let RefAny: func(): any
+  RefAny = FuncNoArgRetNumber
+  RefAny = FuncNoArgRetString
+  CheckDefFailure(['let RefAny: func(): any', 'RefAny = FuncNoArgNoRet'], 'E1013: type mismatch, expected func(): any but got func()')
+  CheckDefFailure(['let RefAny: func(): any', 'RefAny = FuncOneArgNoRet'], 'E1013: type mismatch, expected func(): any but got func(number)')
+
+  let RefNr: func: number
+  RefNr = FuncNoArgRetNumber
+  RefNr = FuncOneArgRetNumber
+  CheckDefFailure(['let RefNr: func: number', 'RefNr = FuncNoArgNoRet'], 'E1013: type mismatch, expected func(): number but got func()')
+  CheckDefFailure(['let RefNr: func: number', 'RefNr = FuncNoArgRetString'], 'E1013: type mismatch, expected func(): number but got func(): string')
+
+  let RefStr: func: string
+  RefStr = FuncNoArgRetString
+  RefStr = FuncOneArgRetString
+  CheckDefFailure(['let RefStr: func: string', 'RefStr = FuncNoArgNoRet'], 'E1013: type mismatch, expected func(): string but got func()')
+  CheckDefFailure(['let RefStr: func: string', 'RefStr = FuncNoArgRetNumber'], 'E1013: type mismatch, expected func(): string but got func(): number')
+enddef
+
 def Test_func_type_fails()
   CheckDefFailure(['let ref1: func()'], 'E704:')
 
diff --git a/src/version.c b/src/version.c
index bcf333b..f08ca11 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    527,
+/**/
     526,
 /**/
     525,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 359007a..18fbdd3 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -314,6 +314,11 @@
     // recognize commonly used types
     if (argcount <= 0)
     {
+	if (ret_type == &t_unknown)
+	{
+	    // (argcount == 0) is not possible
+	    return &t_func_unknown;
+	}
 	if (ret_type == &t_void)
 	{
 	    if (argcount == 0)
@@ -350,6 +355,7 @@
 	return &t_any;
     type->tt_type = VAR_FUNC;
     type->tt_member = ret_type;
+    type->tt_argcount = argcount;
     type->tt_args = NULL;
     return type;
 }
@@ -1589,7 +1595,7 @@
 	    if (len == 4 && STRNCMP(*arg, "func", len) == 0)
 	    {
 		type_T  *type;
-		type_T  *ret_type = &t_any;
+		type_T  *ret_type = &t_unknown;
 		int	argcount = -1;
 		int	flags = 0;
 		int	first_optional = -1;
@@ -1657,7 +1663,7 @@
 		{
 		    // parse return type
 		    ++*arg;
-		    if (!VIM_ISWHITE(*p))
+		    if (!VIM_ISWHITE(**arg))
 			semsg(_(e_white_after), ":");
 		    *arg = skipwhite(*arg);
 		    ret_type = parse_type(arg, type_gap);
@@ -2405,7 +2411,10 @@
 {
     int ret = OK;
 
-    if (expected->tt_type != VAR_UNKNOWN && expected->tt_type != VAR_ANY)
+    // When expected is "unknown" we accept any actual type.
+    // When expected is "any" we accept any actual type except "void".
+    if (expected->tt_type != VAR_UNKNOWN
+	    && (expected->tt_type != VAR_ANY || actual->tt_type == VAR_VOID))
     {
 	if (expected->tt_type != actual->tt_type)
 	{
@@ -2421,8 +2430,7 @@
 	}
 	else if (expected->tt_type == VAR_FUNC)
 	{
-	    if (expected->tt_member != &t_any
-					  && expected->tt_member != &t_unknown)
+	    if (expected->tt_member != &t_unknown)
 		ret = check_type(expected->tt_member, actual->tt_member, FALSE);
 	    if (ret == OK && expected->tt_argcount != -1
 		    && (actual->tt_argcount < expected->tt_min_argcount
@@ -4044,36 +4052,39 @@
 	if (r == FAIL)
 	    goto theend;
 
-	stack = &cctx->ctx_type_stack;
-	stacktype = stack->ga_len == 0 ? &t_void
-			      : ((type_T **)stack->ga_data)[stack->ga_len - 1];
-	if (idx >= 0 && (is_decl || !has_type))
+	if (cctx->ctx_skip != TRUE)
 	{
-	    lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
-	    if (new_local && !has_type)
+	    stack = &cctx->ctx_type_stack;
+	    stacktype = stack->ga_len == 0 ? &t_void
+			      : ((type_T **)stack->ga_data)[stack->ga_len - 1];
+	    if (idx >= 0 && (is_decl || !has_type))
 	    {
-		if (stacktype->tt_type == VAR_VOID)
+		lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+		if (new_local && !has_type)
 		{
-		    emsg(_("E1031: Cannot use void value"));
-		    goto theend;
-		}
-		else
-		{
-		    // An empty list or dict has a &t_void member, for a
-		    // variable that implies &t_any.
-		    if (stacktype == &t_list_empty)
-			lvar->lv_type = &t_list_any;
-		    else if (stacktype == &t_dict_empty)
-			lvar->lv_type = &t_dict_any;
+		    if (stacktype->tt_type == VAR_VOID)
+		    {
+			emsg(_("E1031: Cannot use void value"));
+			goto theend;
+		    }
 		    else
-			lvar->lv_type = stacktype;
+		    {
+			// An empty list or dict has a &t_void member, for a
+			// variable that implies &t_any.
+			if (stacktype == &t_list_empty)
+			    lvar->lv_type = &t_list_any;
+			else if (stacktype == &t_dict_empty)
+			    lvar->lv_type = &t_dict_any;
+			else
+			    lvar->lv_type = stacktype;
+		    }
 		}
+		else if (need_type(stacktype, lvar->lv_type, -1, cctx) == FAIL)
+		    goto theend;
 	    }
-	    else if (need_type(stacktype, lvar->lv_type, -1, cctx) == FAIL)
+	    else if (*p != '=' && check_type(type, stacktype, TRUE) == FAIL)
 		goto theend;
 	}
-	else if (*p != '=' && check_type(type, stacktype, TRUE) == FAIL)
-	    goto theend;
     }
     else if (cmdidx == CMD_const)
     {