Process completed with exit code 1.

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The use of ‘~’ without TypeOperators

Defined but not used: ‘old_env’

The import of ‘Control.Monad.Except’ is redundant

Pattern match(es) are non-exhaustive

Pattern match(es) are non-exhaustive

Pattern match(es) are non-exhaustive

Pattern match(es) are non-exhaustive

Pattern match(es) are non-exhaustive

Pattern match(es) are non-exhaustive