Hi, I recently was looking at the type for head: ghci> :t head head :: GHC.Stack.Types.HasCallStack => [a] -> a And realised I have no idea what GHC.Stack.Types.HasCallStack is. Can anyone explain what it is?

What is GHC.Stack.Types.HasCallStack

Kleidukos December 27, 2023, 7:08pm 2

Hi! you’ll find the documentation here: GHC.Stack

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Monadic Parsing in Haskell