Merge pull request #85 from fnichol/fnichol/rustfmt-exit-3

Support rustfmt 0.5.0 exit codes.

Author: chris-morgan

autoload/rustfmt.vim

@@ -29,7 +29,7 @@ function! rustfmt#Format()
 
   let out = systemlist(command . g:rustfmt_options . " " . shellescape(l:tmpname))
 
-  if v:shell_error == 0
+  if v:shell_error == 0 || v:shell_error == 3
     " remove undo point caused via BufWritePre
     try | silent undojoin | catch | endtry