patch 7.4.1228

Problem:    copy() and deepcopy() fail with special variables. (Nikolai
            Pavlov)
Solution:   Make it work.  Add a test.  Closes #614.

Author: brammool

src/eval.c

@@ -21939,6 +21939,7 @@ item_copy(
 #endif
 	case VAR_STRING:
 	case VAR_FUNC:
+	case VAR_SPECIAL:
 	    copy_tv(from, to);
 	    break;
 	case VAR_LIST:

src/testdir/test_viml.vim

@@ -1001,6 +1001,16 @@ func Test_type()
     call assert_equal(v:none, eval(string(v:none)))
     call assert_equal(v:null, eval(string(v:null)))
 
+    call assert_equal(v:false, copy(v:false))
+    call assert_equal(v:true, copy(v:true))
+    call assert_equal(v:none, copy(v:none))
+    call assert_equal(v:null, copy(v:null))
+
+    call assert_equal([v:false], deepcopy([v:false]))
+    call assert_equal([v:true], deepcopy([v:true]))
+    call assert_equal([v:none], deepcopy([v:none]))
+    call assert_equal([v:null], deepcopy([v:null]))
+
     call assert_true(empty(v:false))
     call assert_false(empty(v:true))
     call assert_true(empty(v:null))

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1228,
 /**/
     1227,
 /**/