diff --git a/semantic-core/src/Analysis/Concrete.hs b/semantic-core/src/Analysis/Concrete.hs
index f6309b1b0..a05c4a8fe 100644
--- a/semantic-core/src/Analysis/Concrete.hs
+++ b/semantic-core/src/Analysis/Concrete.hs
@@ -78,7 +78,7 @@ concrete
      -> (term Name -> m (Concrete (term Name)))
      )
   -> [File (term Name)]
-  -> (Heap (term Name), [File (Either (File String) (Concrete (term Name)))])
+  -> (Heap (term Name), [File (Either (Path, Span, String) (Concrete (term Name)))])
 concrete eval
   = run
   . runFresh
@@ -100,7 +100,7 @@ runFile
      -> (term Name -> m (Concrete (term Name)))
      )
   -> File (term Name)
-  -> m (File (Either (File String) (Concrete (term Name))))
+  -> m (File (Either (Path, Span, String) (Concrete (term Name))))
 runFile eval file = traverse run file
   where run = runReader (filePath file)
             . runReader (fileSpan file)
diff --git a/semantic-core/src/Analysis/ImportGraph.hs b/semantic-core/src/Analysis/ImportGraph.hs
index 638eb7ee8..0369f4f65 100644
--- a/semantic-core/src/Analysis/ImportGraph.hs
+++ b/semantic-core/src/Analysis/ImportGraph.hs
@@ -59,7 +59,7 @@ importGraph
      )
   -> [File term]
   -> ( Heap Name (Value term)
-     , [File (Either (File String) (Value term))]
+     , [File (Either (Path, Span, String) (Value term))]
      )
 importGraph eval
   = run
@@ -82,7 +82,7 @@ runFile
      -> (term -> m (Value term))
      )
   -> File term
-  -> m (File (Either (File String) (Value term)))
+  -> m (File (Either (Path, Span, String) (Value term)))
 runFile eval file = traverse run file
   where run = runReader (filePath file)
             . runReader (fileSpan file)
diff --git a/semantic-core/src/Analysis/ScopeGraph.hs b/semantic-core/src/Analysis/ScopeGraph.hs
index daa1363f3..d013adc8a 100644
--- a/semantic-core/src/Analysis/ScopeGraph.hs
+++ b/semantic-core/src/Analysis/ScopeGraph.hs
@@ -56,7 +56,7 @@ scopeGraph
      -> (term -> m ScopeGraph)
      )
   -> [File term]
-  -> (Heap Name ScopeGraph, [File (Either (File String) ScopeGraph)])
+  -> (Heap Name ScopeGraph, [File (Either (Path, Span, String) ScopeGraph)])
 scopeGraph eval
   = run
   . runFresh
@@ -77,7 +77,7 @@ runFile
      -> (term -> m ScopeGraph)
      )
   -> File term
-  -> m (File (Either (File String) ScopeGraph))
+  -> m (File (Either (Path, Span, String) ScopeGraph))
 runFile eval file = traverse run file
   where run = runReader (filePath file)
             . runReader (fileSpan file)
diff --git a/semantic-core/src/Analysis/Typecheck.hs b/semantic-core/src/Analysis/Typecheck.hs
index 7e8242328..c77d6ab38 100644
--- a/semantic-core/src/Analysis/Typecheck.hs
+++ b/semantic-core/src/Analysis/Typecheck.hs
@@ -102,7 +102,7 @@ typecheckingFlowInsensitive
      )
   -> [File term]
   -> ( Heap Name Type
-     , [File (Either (File String) (Term (Polytype :+: Monotype) Void))]
+     , [File (Either (Path, Span, String) (Term (Polytype :+: Monotype) Void))]
      )
 typecheckingFlowInsensitive eval
   = run
@@ -125,7 +125,7 @@ runFile
      -> (term -> m Type)
      )
   -> File term
-  -> m (File (Either (File String) Type))
+  -> m (File (Either (Path, Span, String) Type))
 runFile eval file = traverse run file
   where run
           = (\ m -> do
diff --git a/semantic-core/src/Control/Carrier/Fail/WithFile.hs b/semantic-core/src/Control/Carrier/Fail/WithFile.hs
index e6513c7b6..d37c42229 100644
--- a/semantic-core/src/Control/Carrier/Fail/WithFile.hs
+++ b/semantic-core/src/Control/Carrier/Fail/WithFile.hs
@@ -13,18 +13,20 @@ import Control.Effect.Error
 import Control.Effect.Fail (Fail(..), MonadFail(..))
 import Control.Effect.Reader
 import Data.Loc
-import Data.File
 import Prelude hiding (fail)
 import Source.Span
 
-runFail :: FailC m a -> m (Either (File String) a)
+runFail :: FailC m a -> m (Either (Path, Span, String) a)
 runFail = runError . runFailC
 
-newtype FailC m a = FailC { runFailC :: ErrorC (File String) m a }
+newtype FailC m a = FailC { runFailC :: ErrorC (Path, Span, String) m a }
   deriving (Alternative, Applicative, Functor, Monad)
 
 instance (Carrier sig m, Effect sig, Member (Reader Path) sig, Member (Reader Span) sig) => MonadFail (FailC m) where
-  fail s = File <$> ask <*> ask <*> pure s >>= FailC . throwError
+  fail s = do
+    path <- ask
+    span <- ask
+    FailC (throwError (path :: Path, span :: Span, s))
 
 instance (Carrier sig m, Effect sig, Member (Reader Path) sig, Member (Reader Span) sig) => Carrier (Fail :+: sig) (FailC m) where
   eff (L (Fail s)) = fail s