3 files changed, 1 insertions, 10 deletions
diff --git a/compiler/GHC/Tc/Solver/Canonical.hs b/compiler/GHC/Tc/Solver/Canonical.hs
index ce8bf24632..fd608c3314 100644
--- a/compiler/GHC/Tc/Solver/Canonical.hs
+++ b/compiler/GHC/Tc/Solver/Canonical.hs
@@ -956,11 +956,6 @@ can_eq_nc'
    -> Type -> Type    -- RHS, after and before type-synonym expansion, resp
    -> TcS (StopOrContinue Ct)
 
--- See Note [Comparing nullary type synonyms] in GHC.Core.Type.
-can_eq_nc' _flat _rdr_env _envs ev eq_rel ty1@(TyConApp tc1 []) _ps_ty1 (TyConApp tc2 []) _ps_ty2
-  | tc1 == tc2
-  = canEqReflexive ev eq_rel ty1
-
 -- Expand synonyms first; see Note [Type synonyms and canonicalization]
 can_eq_nc' rewritten rdr_env envs ev eq_rel ty1 ps_ty1 ty2 ps_ty2
   | Just ty1' <- tcView ty1 = can_eq_nc' rewritten rdr_env envs ev eq_rel ty1' ps_ty1 ty2  ps_ty2
diff --git a/compiler/GHC/Tc/Utils/TcMType.hs b/compiler/GHC/Tc/Utils/TcMType.hs
index e688dd5685..ccb9152e01 100644
--- a/compiler/GHC/Tc/Utils/TcMType.hs
+++ b/compiler/GHC/Tc/Utils/TcMType.hs
@@ -120,6 +120,7 @@ import GHC.Types.Id as Id
 import GHC.Types.Name
 import GHC.Types.Var.Set
 import GHC.Builtin.Types
+import GHC.Builtin.Types.Prim
 import GHC.Types.Var.Env
 import GHC.Types.Name.Env
 import GHC.Utils.Misc
diff --git a/compiler/GHC/Tc/Utils/TcType.hs b/compiler/GHC/Tc/Utils/TcType.hs
index 6e4eea8f19..3e52419772 100644
--- a/compiler/GHC/Tc/Utils/TcType.hs
+++ b/compiler/GHC/Tc/Utils/TcType.hs
@@ -1581,11 +1581,6 @@ tc_eq_type keep_syns vis_only orig_ty1 orig_ty2
   = go orig_env orig_ty1 orig_ty2
   where
     go :: RnEnv2 -> Type -> Type -> Bool
-    -- See Note [Comparing nullary type synonyms] in GHC.Core.Type.
-    go _   (TyConApp tc1 []) (TyConApp tc2 [])
-      | tc1 == tc2
-      = True
-
     go env t1 t2 | not keep_syns, Just t1' <- tcView t1 = go env t1' t2
     go env t1 t2 | not keep_syns, Just t2' <- tcView t2 = go env t1 t2'