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Adapting to this change might require defining missing `Functor` instances for types implementing the `Bifunctor` class, or adding extra contexts, similarly to the previous two subsections. A complete migration guide is available [here](https://github.com/haskell/core-libraries-committee/blob/main/guides/bifunctor-superclass.md).
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### `liftA2` exported by Prelude
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`Control.Applicative.liftA2` is now re-exported by the `Prelude`, as per [CLC proposal #3](https://github.com/haskell/core-libraries-committee/issues/3). This can trigger redundant import warnings. See [the migration guide](https://github.com/haskell/core-libraries-committee/blob/main/guides/export-lifta2-prelude.md) for advice about how to proceed.
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### `mtl` 2.3 changes
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GHC now bundles `mtl` 2.3, which includes some non-backwards-compatible changes:
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