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Asked: 2026-05-11T14:02:16+00:00

I have the following Template Haskell code in my module, which is part of

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I have the following Template Haskell code in my module, which is part of a larger application.

$(derive makeFoldable ''JStatement)

I suspect that the generated instance of Foldable is not exactly what I originally had in mind, but I can’t find a way to verify this. So, preferrably using only ghci, is it possible to view the generated instance?

I tried the following and got a syntax error and I’m guessing this is because I’m Doing It Wrong™.

> derive makeFoldable ''JStatement  <interactive>:1:21:     lexical error in string/character literal at character '\''
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  1. I figured it out. If you pass -ddump-splices it will print the generated instances to the terminal when compiling the module.

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