Commit 6c2eba7f authored by Mikhail Glushenkov's avatar Mikhail Glushenkov Committed by Edward Z. Yang
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Clarify our policy on cabal-install support window.

It wasn't clear what "three-year support window for cabal-install"
means re: self-upgrade.

[ci skip]
parent 648381f7
......@@ -147,11 +147,13 @@ Conventions
buildable out-of-the-box with the dependencies that shipped with GHC
for at least five years. The Travis CI checks this, so most
developers submit a PR to see if their code works on all these
versions of GHC. cabal-install must also be buildable on all
versions of GHC. `cabal-install` must also be buildable on all
supported GHCs, although it does not have to be buildable
out-of-the-box. Instead, the `cabal-install/` script
must be able to download and install all of the dependencies. (This
is also checked by CI!)
must be able to download and install all of the dependencies (this
is also checked by CI). Also, self-upgrade to the latest version
(i.e. `cabal install cabal-install`) must work with all versions of
`cabal-install` released during the last three years.
* `Cabal` has its own Prelude, in `Distribution.Compat.Prelude`,
that provides a compatibility layer and exports some commonly
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