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Add GHC-88333 - #511
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Bodigrim
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Feb 2, 2025
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| This error is about the incorrect use of type variables in the injectivity condition of type families. | ||
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| Type families in Haskell are a way to define type-level functions. An injectivity annotation (| a -> r) is used to specify that for a given input type a, there is exactly one output type r that the type family can map to. |
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Could we please use Markdown backticks here and elsewhere?
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| Type families in Haskell are a way to define type-level functions. An injectivity annotation (| a -> r) is used to specify that for a given input type a, there is exactly one output type r that the type family can map to. | |
| Type families in Haskell are a way to define type-level functions. An injectivity annotation (`| a -> r`) is used to specify that for a given input type `a`, there is exactly one output type `r` that the type family can map to. |
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Documented GHC-8833: TcRnIncorrectTyVarOnLhsOfInjCond