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-rw-r--r--haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs b/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs
index 7e568933..37632ee7 100644
--- a/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs
+++ b/haddock-api/src/Haddock/Backends/Xhtml/Specialize.hs
@@ -159,7 +159,7 @@ renameType HsWildcardTy = pure HsWildcardTy
renameType (HsNamedWildcardTy name) = HsNamedWildcardTy <$> renameName name
-freeVariables :: forall name. (NamedThing name, Data (HsType name))
+freeVariables :: forall name. (NamedThing name, DataId name)
=> HsType name -> Set OccName
freeVariables =
everythingWithState Set.empty Set.union query