Improve guard so it works for no eof new line

after/ftplugin/cabal.vim

@@ -1,5 +1,7 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'haskell') == -1
+
 setlocal comments=s1fl:{-,mb:-,ex:-},:--
 setlocal iskeyword+=-,.,*
 setlocal commentstring=--\ %s
+
 endif