[Haskell-cafe] New type of expressions containing (error ...) includes noisy implicit parameter

[Bryan Richter]

On Sat, Feb 13, 2016 at 09:18:07AM -0800, Eric Seidel wrote:
> Here's what the GHCi session should look like.
> 
> > $ ghci
> > GHCi, version 8.0.0.20160204: http://www.haskell.org/ghc/  :? for help
> > Loaded GHCi configuration from /home/callen/.ghci
> > Prelude> let myList = [1..5 :: Integer]
> > Prelude> let myList' = myList ++ undefined
> > Prelude> :t myList'
> > myList' :: HasCallStack => [Integer]

What use case is satisfied by providing this information? How does it
benefit the Haskell programmer? How do I use it?
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