Update

syntax/eelixir.vim

@@ -4,6 +4,9 @@ if exists("b:current_syntax")
   finish
 endif
 
+let s:cpo_save = &cpo
+set cpo&vim
+
 if !exists("main_syntax")
   let main_syntax = 'eelixir'
 endif
@@ -62,4 +65,7 @@ if main_syntax == 'eelixir'
   unlet main_syntax
 endif
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
 endif