Remove MonadFail (ST s) instance

Henning Thielemann lemming at
Sun Nov 24 16:42:58 UTC 2019

On Sun, 24 Nov 2019, Oleg Grenrus wrote:

> I suggest and propose the removal without any deprecation period. If 
> someone depends on this behavior, they ought to fix they code 
> immediately: it's straight forward compiler type-error driven 
> refactoring.

sounds reasonable

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