patch 8.2.2718: Vim9: no explicit test for using a global function without g:

Problem:    Vim9: no explicit test for using a global function without the g:
            prefix.
Solution:   Add a test case.
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 957b632..5e3ca1c 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -621,6 +621,30 @@
   END
   CheckScriptFailure(lines, 'E705:')
   delfunc g:Func
+
+  # global function is found without g: prefix
+  lines =<< trim END
+      vim9script
+      def g:Func(): string
+        return 'global'
+      enddef
+      def AnotherFunc(): string
+        return Func()
+      enddef
+      assert_equal('global', AnotherFunc())
+    delfunc g:Func
+  END
+  CheckScriptSuccess(lines)
+
+  lines =<< trim END
+      vim9script
+      def g:Func(): string
+        return 'global'
+      enddef
+      assert_equal('global', Func())
+      delfunc g:Func
+  END
+  CheckScriptSuccess(lines)
 enddef
 
 func TakesOneArg(arg)
diff --git a/src/version.c b/src/version.c
index f22d0cb..961ddea 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2718,
+/**/
     2717,
 /**/
     2716,