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Herbert Valerio Riedel authored
65e9b88b made template-haskell non-upgradable 65ae95c1 made it upgradable again ...and this commit makes it non-upgradable again While there may be a few cases when `template-haskell` can be reinstalled, it's generally not advisable, and causes more harm than the benefit in the few cases where we'd gain install-plan flexibility (e.g. when only template-haskell's API is needed for compile, but no actual TH evaluation takes place). Closes #4098
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