{"action":"closed","issue":{"url":"https://api.github.com/repos/ekmett/monoids/issues/2","repository_url":"https://api.github.com/repos/ekmett/monoids","labels_url":"https://api.github.com/repos/ekmett/monoids/issues/2/labels{/name}","comments_url":"https://api.github.com/repos/ekmett/monoids/issues/2/comments","events_url":"https://api.github.com/repos/ekmett/monoids/issues/2/events","html_url":"https://github.com/ekmett/monoids/issues/2","id":2323774,"number":2,"title":"No Reducer instances for containers","user":{"login":"w3rs","id":316777,"avatar_url":"https://avatars.githubusercontent.com/u/316777?v=3","gravatar_id":"","url":"https://api.github.com/users/w3rs","html_url":"https://github.com/w3rs","followers_url":"https://api.github.com/users/w3rs/followers","following_url":"https://api.github.com/users/w3rs/following{/other_user}","gists_url":"https://api.github.com/users/w3rs/gists{/gist_id}","starred_url":"https://api.github.com/users/w3rs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/w3rs/subscriptions","organizations_url":"https://api.github.com/users/w3rs/orgs","repos_url":"https://api.github.com/users/w3rs/repos","events_url":"https://api.github.com/users/w3rs/events{/privacy}","received_events_url":"https://api.github.com/users/w3rs/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2011-11-22T22:17:39Z","updated_at":"2016-11-13T08:28:25Z","closed_at":"2016-11-13T08:28:25Z","body":"In fresh ghci session:\n\n```\nghci> :m Data.Set Data.Monoid.Reducer\nghci> unit () :: Set ()\n\n<interactive>:1:1:\n    No instance for (Reducer () (Set ()))\n      arising from a use of `unit'\n    Possible fix: add an instance declaration for (Reducer () (Set ()))\n    In the expression: unit () :: Set ()\n    In an equation for `it': it = unit () :: Set ()\nghci> unit () :: [()] -- for comparison\n[()]\n```\n\nSame for Map and probably other containers. I think you should remove these \"#ifdef M_CONTAINERS\" lines. I searched in google for \"M_CONTAINERS\", and this seems to be only in monoids package.\n"}}
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