Try type parsers in a different order

src/Language/GraphQL/AST/Lexer.hs

@@ -3,7 +3,7 @@
 
 -- | This module defines a bunch of small parsers used to parse individual
 --   lexemes.
-module Language.GraphQL.AST.Lexer 
+module Language.GraphQL.AST.Lexer
     ( Parser
     , amp
     , at

src/Language/GraphQL/AST/Parser.hs

@@ -152,9 +152,9 @@ defaultValue = equals *> value
 -- * Input Types
 
 type_ :: Parser Type
-type_ = try (TypeNamed <$> name <* but "!")
-    <|> TypeList       <$> brackets type_
-    <|> TypeNonNull    <$> nonNullType
+type_ = try (TypeNonNull <$> nonNullType)
+    <|> TypeList <$> brackets type_
+    <|> TypeNamed <$> name
     <?> "type_ error!"
 
 nonNullType :: Parser NonNullType

src/Language/GraphQL/AST/Transform.hs

@@ -13,12 +13,10 @@ import Control.Monad (foldM, unless)
 import Control.Monad.Trans.Class (lift)
 import Control.Monad.Trans.Reader (ReaderT, ask, runReaderT)
 import Control.Monad.Trans.State (StateT, evalStateT, gets, modify)
-import Data.Foldable (toList)
 import Data.HashMap.Strict (HashMap)
 import qualified Data.HashMap.Strict as HashMap
 import qualified Data.List.NonEmpty as NonEmpty
 import Data.Sequence (Seq, (<|), (><))
-import qualified Data.Sequence as Sequence
 import qualified Language.GraphQL.AST as Full
 import qualified Language.GraphQL.AST.Core as Core
 import qualified Language.GraphQL.Schema as Schema
@@ -99,10 +97,9 @@ collectFragments = do
 fragmentDefinition ::
     Full.FragmentDefinition ->
     TransformT (Seq Core.Selection)
-fragmentDefinition (Full.FragmentDefinition name _tc _dirs sels) = do
+fragmentDefinition (Full.FragmentDefinition name _tc _dirs selections) = do
     modify deleteFragmentDefinition
-    selections <- traverse selection sels
-    let newValue = either id pure =<< Sequence.fromList (toList selections)
+    newValue <- appendSelection selections
     modify $ insertFragment newValue
     liftJust newValue
   where