patch 7.4.1173
Problem:    No test for new behavior of v:true et al.
Solution:   Add a test.
diff --git a/src/testdir/test_viml.vim b/src/testdir/test_viml.vim
index 522515c..f32331a 100644
--- a/src/testdir/test_viml.vim
+++ b/src/testdir/test_viml.vim
@@ -982,6 +982,11 @@
     call assert_true(v:none isnot 0)
     call assert_true(v:null isnot 0)
     call assert_true(v:null isnot v:none)
+
+    call assert_equal(v:false, eval(string(v:false)))
+    call assert_equal(v:true, eval(string(v:true)))
+    call assert_equal(v:none, eval(string(v:none)))
+    call assert_equal(v:null, eval(string(v:null)))
 endfunc
 
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