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conal / MemoTrie

Trie-based memo functions
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Data.Memotrie: Semigroup instance for :->: (GHC 8.4 compat) #16

Closed deepfire closed 6 years ago

deepfire commented 6 years ago

Tested on GHC 8.4.1-alpha1 and 8.0.2.

The failure on 8.4.1, otherwise is:

Building library for MemoTrie-0.6.8..
[1 of 1] Compiling Data.MemoTrie    ( src/Data/MemoTrie.hs, dist/build/Data/MemoTrie.o )

src/Data/MemoTrie.hs:588:10: error:
    • Could not deduce (Semigroup (a :->: b))
        arising from the superclasses of an instance declaration
      from the context: (HasTrie a, Monoid b)
        bound by the instance declaration at src/Data/MemoTrie.hs:588:10-51
    • In the instance declaration for ‘Monoid (a :->: b)’
    |
588 | instance (HasTrie a, Monoid b) => Monoid (a :->: b) where
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
builder for ‘/nix/store/anxgazq5skf8n9g9gji30zf53r5008p3-MemoTrie-0.6.8.drv’ failed with exit code 1
deepfire commented 6 years ago

cc @conal

conal commented 6 years ago

Thanks! Released.