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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer type="project">
<email>haskell@gentoo.org</email>
<name>Gentoo Haskell</name>
</maintainer>
<use>
<flag name="hashable">
Enisable the use of the `hashable` package. Disabling this may be useful
for accelerating builds in sandboxes for expert users.
Note: `-hashable` implies `-unordered-containers`, as we are necessarily
not able to supply those instances as well.
</flag>
<flag name="containers">
Enable the use of the `containers` package. Disabling this may be useful
for accelerating builds in sandboxes for expert users.
</flag>
<flag name="unordered-containers">
Enable the use of the `unordered-containers` package. Disabling this may
be useful for accelerating builds in sandboxes for expert users.
</flag>
</use>
<longdescription>
Haskellers are usually familiar with monoids and semigroups. A monoid has an appending operation `<>` (or `mappend`),
and an identity element, `mempty`. A semigroup has an appending `<>` operation, but does not require a `mempty` element.
A Semiring has two appending operations, `plus` and `times`, and two respective identity elements, `zero` and `one`.
More formally, a Semiring R is a set equipped with two binary relations `+` and `*`, such that:
(R,+) is a commutative monoid with identity element 0,
(R,*) is a monoid with identity element 1,
(*) left and right distributes over addition, and
multiplication by '0' annihilates R.
</longdescription>
</pkgmetadata>
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