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GHC-8.6.1/Nightly-2018-10-17#943
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lierdakil wants to merge 13 commits into
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Again, I threw stuff at the compiler until it... well, compiled. Specs pass, apparently.
Mostly some changes to internal types.
One major change is that
<-patterns that may fail now require the monad in question to haveMonadFailinstance. I figured this out rather late into the process, so it so happens I have replaced fallible patterns withfromJustNotewhere appropriate, I think in one place using an irrefutable pattern, and withheadin another. There is little rhyme or reason to why I used a particular way to do this. I just chose whatever seemed the most convenient at the time.Note: this branch is only compatible with ghc 8.6, I threw away some CPP guards and didn't bother with introducing new ones in the slightest. I vaguely remember that splitting off ghc-mod-core was in part in order to ditch all that CPP horribleness by tying the core to GHC releases. I guess that never happened? Anyway, be careful with this.