html-test: Always set language

from ghc-9.2 on, the “default” langauge of GHC is expected to change
more wildly. To prepare for that (and unblock
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/4853), this sets the
language for all the test files to `Haskell2010`. This should insolate
this test suite against changes to the default.

Author: nomeata

hoogle-test/src/Bug722/Bug722.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 {-# LANGUAGE TypeOperators, TypeFamilies #-}
 module Bug722 where
 

hoogle-test/src/Bug806/Bug806.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE UndecidableInstances #-}

hoogle-test/src/Bug825/Bug825.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE TypeOperators #-}
 module Bug825 where

hoogle-test/src/Bug873/Bug873.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 module Bug873 (($), ($$)) where
 infixr 0 $$
 

hoogle-test/src/Bug946/Bug946.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 {-# LANGUAGE PatternSynonyms #-}
 module Bug946 (
   AnInt(AnInt, Zero),

hoogle-test/src/Bug992/Bug992.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 {-# LANGUAGE KindSignatures #-}
 
 module Bug992 where

hoogle-test/src/assoc-types/AssocTypes.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE AllowAmbiguousTypes #-}
 

hoogle-test/src/classes/Classes.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 module Classes where
 
 

hoogle-test/src/fixity/Fixity.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 module Fixity where
 
 

hoogle-test/src/modules/Bar.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE Haskell2010 #-}
 module Bar where