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Couldn't match type ‘'False’ with ‘'True’ #141
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mgsloan
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that referenced
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May 21, 2019
Ah, interesting! This is coming from the general obtuseness of GHC complaining about constraints deep in instance resolution. I've improved the errors in d6bee5a and released as version 0.5.1.1 Error with base>=4.9:
Error from before
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💪 Nice! |
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It's the same issue I encountered in
persist
: minad/persist#4Here's a gist with a reproducible case:
https://gist.github.com/chrisdone/c908dbdbbeaaa945575ce5be7b47b9a6
I was deriving the type with TH (commented out), but it's reproducible with the derived sum type copy/pasted in.
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