Reproduce bug in test.

compiler/src/Parse/Declaration.hs

@@ -39,6 +39,7 @@ data Decl
   | Alias (Maybe Src.DocComment) (A.Located Src.Alias)
   | Port (Maybe Src.DocComment) Src.Port
   | TopLevelComments (NonEmpty Src.Comment)
+  deriving (Show)
 
 declaration :: Space.Parser E.Decl (Decl, [Src.Comment])
 declaration =

gren.cabal

@@ -263,6 +263,7 @@ Test-Suite gren-tests
         Parse.SpaceSpec
         Parse.UnderscorePatternSpec
         Parse.MultilineStringSpec
+        Parse.DeclSpec
 
     Build-Depends:
         hspec >= 2.7.10 && < 3

tests/Parse/DeclSpec.hs

@@ -0,0 +1,37 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module Parse.DeclSpec where
+
+import Data.ByteString qualified as BS
+import Helpers.Instances ()
+import Parse.Declaration (declaration)
+import Parse.Primitives qualified as P
+import Test.Hspec (Spec, describe, it, shouldSatisfy)
+
+data ParseError
+  = DeclError P.Row P.Col
+  | OtherError String P.Row P.Col
+  deriving (Show, Eq)
+
+spec :: Spec
+spec = do
+  describe "Top Level Variables" $ do
+    it "regression test" $
+      parse "test = \"test\""
+
+    it "Variables can be non-ascii characters" $ do
+      parse "æøå = \"test\""
+
+parse :: BS.ByteString -> IO ()
+parse str =
+   P.fromByteString
+      (P.specialize (\_ row col -> DeclError row col) declaration)
+      (OtherError "fromByteString failed")
+      str
+    `shouldSatisfy` valid
+
+valid :: Either x y -> Bool
+valid result =
+  case result of
+    Right _ -> True
+    Left _ -> False