Improve guard so it works for no eof new line

after/syntax/haskell.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'dhall') == -1
+
 " store and remove current syntax value
 let old_syntax = b:current_syntax
 unlet b:current_syntax
@@ -12,4 +13,5 @@ hi def link quasiQuote Underlined
 
 " restore current syntax value
 let b:current_syntax = old_syntax
+
 endif