package07e.hs:2:1:
    Failed to load interface for ‘MyHsTypes’
    Perhaps you meant
      HsTypes (needs flag -package-key ghc-<VERSION>)
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package07e.hs:3:1:
    Failed to load interface for ‘HsTypes’
    It is a member of the hidden package ‘ghc-<VERSION>’.
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package07e.hs:4:1:
    Failed to load interface for ‘HsUtils’
    It is a member of the hidden package ‘ghc-<VERSION>’.
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package07e.hs:5:1:
    Failed to load interface for ‘UniqFM’
    It is a member of the hidden package ‘ghc-<VERSION>’.
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