failing with ghc-8.8.1 MonadFail

[juhp]

For Stackage Nightly:

    Preprocessing test suite 'test-simple' for simple-0.11.3..
    Building test suite 'test-simple' for simple-0.11.3..
    
    <no location info>: warning: [-Wmissing-home-modules]
        These modules are needed for compilation but not listed in your .cabal file's other-modules: 
            Web.Simple.Controller.Trans Web.Simple.Responses
    
    <no location info>: warning: [-Wmissing-home-modules]
        These modules are needed for compilation but not listed in your .cabal file's other-modules: 
            Web.Simple.Controller.Trans Web.Simple.Responses
    Preprocessing library for simple-0.11.3..
    Building library for simple-0.11.3..
    [10 of 10] Compiling Web.Simple.Templates
    
    /var/stackage/work/unpack-dir/unpacked/simple-0.11.3-403f671a4a4d8670cc77557e49a63392abf393e4d092b020574640b534039e4c/src/Web/Simple/Templates.hs:128:17: error:
        • Could not deduce (MonadFail (ControllerT hs m))
            arising from a use of ‘fail’
          from the context: (HasTemplates m hs, MonadIO m)
            bound by the type signature for:
                       defaultGetTemplate :: forall (m :: * -> *) hs.
                                             (HasTemplates m hs, MonadIO m) =>
                                             FilePath -> ControllerT hs m Template
            at src/Web/Simple/Templates.hs:(123,1)-(124,59)
        • In the expression: fail str
          In a case alternative: Left str -> fail str
          In a stmt of a 'do' block:
            case compileTemplate . decodeUtf8 $ contents of
              Left str -> fail str
              Right tmpl -> return tmpl
        |
    128 |     Left str -> fail str
        |                 ^^^^^^^^

[juhp]

Actually the even build seems to be failing for Stackage Nightly in the same way