Validate repeatable directives

src/Language/GraphQL/AST/DirectiveLocation.hs

@@ -1,6 +1,6 @@
 {-# LANGUAGE Safe #-}
 
--- | Various parts of a GraphQL document can be annotated with directives. 
+-- | Various parts of a GraphQL document can be annotated with directives.
 -- This module describes locations in a document where directives can appear.
 module Language.GraphQL.AST.DirectiveLocation
     ( DirectiveLocation(..)