I still have problems and your code won't typecheck on my machine
printing the following error:
Test.hs:9:34:
No instance for (Control.Monad.CatchIO.MonadCatchIO
(InterpreterT IO))
arising from a use of `catch' at Test.hs:9:34-53
Possible fix:
add an instance declaration for
(Control.Monad.CatchIO.MonadCatchIO (InterpreterT IO))
In the first argument of `runInterpreter', namely
`(code `catch` handler)'
In the second argument of `(=<<)', namely
`(runInterpreter (code `catch` handler))'
In the expression:
print =<< (runInterpreter (code `catch` handler))
I assume we are using different versions of some packages. Could you
please send me the output of your 'ghc-pkg list'.
Thanks,
Martin
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