vim-patch:7.4.1654

Problem:    Crash when using expand('%:S') in a buffer without a name.
Solution:   Don't set a NUL. (James McCoy, closes vim/vim#714)

52c6eaffd4

test/functional/legacy/fnamemodify_spec.lua

@@ -54,6 +54,12 @@ describe('filename modifiers', function()
         set shell=tcsh
         call assert_equal("'abc\\\ndef'", fnamemodify("abc\ndef", ':S'))
       endfunc
+
+      func Test_expand()
+        new
+        call assert_equal("", expand('%:S'))
+        quit
+      endfunc
     ]=])
   end)
 
@@ -61,4 +67,9 @@ describe('filename modifiers', function()
     call('Test_fnamemodify')
     expected_empty()
   end)
+
+  it('works for :S in an unnamed buffer', function()
+    call('Test_expand')
+    expected_empty()
+  end)
 end)