Binding a GADT constructor in let doesn't work #548
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BinderDavid
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Nov 2, 2024
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People sometimes run into this (e.g. here), and the fix is quite non-obvious from the error message. I thought it might be good to expand the pages for the relevant error messages with a relevant example; the existing ones are for very different situations.
I found it very amusing that I needed to edit the pages for two error messages, because the generated error depends on whether
-XTypeFamiliesis active.The text here is kind of stub; I didn't have time to write an in-depth description. Feel free to improve. But hopefully this is already useful.