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# `foldable1-classes-compat`
[][Hackage: foldable1-classes-compat]
[](http://packdeps.haskellers.com/reverse/foldable1-classes-compat)
[][Haskell.org]
[][tl;dr Legal: BSD3]
[](https://github.com/haskell-compat/foldable1-classes-compat/actions?query=workflow%3AHaskell-CI)
[Hackage: foldable1-classes-compat]:
http://hackage.haskell.org/package/foldable1-classes-compat
"foldable1-classes-compat package on Hackage"
[Haskell.org]:
http://www.haskell.org
"The Haskell Programming Language"
[tl;dr Legal: BSD3]:
https://tldrlegal.com/license/bsd-3-clause-license-%28revised%29
"BSD 3-Clause License (Revised)"
A compatibility package for the `Foldable1` and `Bifoldable1` type classes,
which were introduced in `base-4.18.0.0` (GHC 9.6.1). For more information, see
[this Core Libraries Committee
proposal](https://github.com/haskell/core-libraries-committee/issues/9).
`Foldable1` and `Bifoldable1` classify non-empty data structures that can be
folded to a summary value.
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