fix: make instance compatible with ghc9 #370
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GHC 9 is more strict in what instances it accepts. In particular, the instance must look (eliding some details) like instance cxt => head without any parentheses at top level. I.e. instance (c => t) would parse as "empty context, head = (c => t)", and be rightly rejected.
dhess
approved these changes
Apr 11, 2022
2 tasks
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Ohh, OK, cool, that's less of a restriction than I thought. |
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GHC 9 is more strict in what instances it accepts. In particular, the
instance must look (eliding some details) like
instance cxt => head
without any parentheses at top level. I.e.
instance (c => t)
would parse as "empty context, head = (c => t)", and be rightly
rejected.