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Commit 298df16d authored by Krzysztof Gogolewski's avatar Krzysztof Gogolewski Committed by Marge Bot
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Reject type family equation with wrong name (#20260) 

We should reject "type family Foo where Bar = ()".
This check was done in kcTyFamInstEqn but not in tcTyFamInstEqn.
I factored out arity checking, which was duplicated.
parent 5601b9e2
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