runtime(haskell): Add single quote to `iskeyword` in ftplugin (#8191)
The single quote `'` is a valid character in variable names, so it should be included in `iskeyword`; this, for instance, makes the <kbd>*</kbd> command behave predictably
diff --git a/runtime/ftplugin/haskell.vim b/runtime/ftplugin/haskell.vim
index 84f4d05..2a864bf 100644
--- a/runtime/ftplugin/haskell.vim
+++ b/runtime/ftplugin/haskell.vim
@@ -17,6 +17,7 @@
setlocal comments=s1fl:{-,mb:-,ex:-},:-- commentstring=--\ %s
setlocal formatoptions-=t formatoptions+=croql
setlocal omnifunc=haskellcomplete#Complete
+setlocal iskeyword+='
let &cpo = s:cpo_save
unlet s:cpo_save