cabal-install support window for Cabal library version Custom Setup is built with
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Description
Two parts:
1. What should the window be? GHC/Cabal has generally had the property that you need a Setup script built with at least the version of Cabal bundled with GHC to expect things to work. So that would be a reasonable lower bound; Cabal 1.14.0.0 shipped with GHC 7.4.1 so that's probably our window for now.
2. Whatever our support window is, we need to make sure we run cabal-install tests for the sensitive bits on ALL versions of Cabal library. #3790 is a perfect example of a tricky situation that needs tests. So we need tests for 1.14, 1.16, 1.18, 1.20, 1.22 and 1.24.
Seem reasonable?
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