Add support for GHC 9. #2
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sellout
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This moves tests that depend on the plugin from concat-examples to concat-plugin. The one shortcoming, IMO, is that it requries duplicating the SMT flag.
Mostly trivial changes, but we now get the `DynFlags` from `installCoreToDos` rather than each application of `BuiltinRule.ru_try`. This continues to work just fine for GHC 8.10, but doesn't quite work on GHC 9.0 for some reason. I don't think it's the `DynFlags` changes (as that's applied to all GHC versions). But running on GHC 9.0 always fails with "isDeadEndId cccV" (this is slightly stricter than `isBottomingId` in earlier GHCs, but removing that `pprPanic` still fails, just with "Oops: toCcc'' called" instead). Fixes compiling-to-categories#98.
Doesn't cover the plugin yet.
sellout
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May 16, 2022
This time, re-add it for GD to unbreak compile.
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