[Haskell-beginners] What does 'impossible happened' mean?

[David McBride]

It may be a bug in ghc.  It may be a bug in stack.  Not much you can do
about it other than to report it.

On Mon, Dec 11, 2017 at 11:39 AM, Baa <aquagnu at gmail.com> wrote:

> Hello, List. I hit error:
>
>     ghc: panic! (the 'impossible' happened)
>       (GHC version 8.0.2 for x86_64-unknown-linux):
>         initTc: unsolved constraints
>       WC {wc_insol = [W] spec_a86e :: t_a86d[tau:1] (CHoleCan: spec)}
>
>     Please report this as a GHC bug:  http://www.haskell.org/ghc/
> reportabug
>
> what does it mean and how to fix it?
>
> PS. I only added template Haskell "call" in my test suite like
>
>   $(blahBlah something)
>
> The same call works fine in other modules and in GHCI. "stack build"
> works too, but tests - no (last stack 1.6.1)
>
> ===
> Best regards, Paul
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