{"action":"created","issue":{"url":"https://api.github.com/repos/evaluni/free-task/issues/18","repository_url":"https://api.github.com/repos/evaluni/free-task","labels_url":"https://api.github.com/repos/evaluni/free-task/issues/18/labels{/name}","comments_url":"https://api.github.com/repos/evaluni/free-task/issues/18/comments","events_url":"https://api.github.com/repos/evaluni/free-task/issues/18/events","html_url":"https://github.com/evaluni/free-task/pull/18","id":190474976,"number":18,"title":"Add a covariance version of TxnT for convenience","user":{"login":"hisui","id":190568,"avatar_url":"https://avatars.githubusercontent.com/u/190568?v=3","gravatar_id":"","url":"https://api.github.com/users/hisui","html_url":"https://github.com/hisui","followers_url":"https://api.github.com/users/hisui/followers","following_url":"https://api.github.com/users/hisui/following{/other_user}","gists_url":"https://api.github.com/users/hisui/gists{/gist_id}","starred_url":"https://api.github.com/users/hisui/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hisui/subscriptions","organizations_url":"https://api.github.com/users/hisui/orgs","repos_url":"https://api.github.com/users/hisui/repos","events_url":"https://api.github.com/users/hisui/events{/privacy}","received_events_url":"https://api.github.com/users/hisui/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":5,"created_at":"2016-11-19T04:01:40Z","updated_at":"2016-11-19T04:39:59Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/evaluni/free-task/pulls/18","html_url":"https://github.com/evaluni/free-task/pull/18","diff_url":"https://github.com/evaluni/free-task/pull/18.diff","patch_url":"https://github.com/evaluni/free-task/pull/18.patch"},"body":"`TxnT[-R, A]` はインバリアントなため、その計算結果に共変なコンテナー型(for example `Either`, `Seq`)などが来ると `flatMap` などで式の型を明記しないと複雑なコンパイルエラーが出てしまっていました。このPRはその問題を迂回するためのものです。"},"comment":{"url":"https://api.github.com/repos/evaluni/free-task/issues/comments/261693126","html_url":"https://github.com/evaluni/free-task/pull/18#issuecomment-261693126","issue_url":"https://api.github.com/repos/evaluni/free-task/issues/18","id":261693126,"user":{"login":"hisui","id":190568,"avatar_url":"https://avatars.githubusercontent.com/u/190568?v=3","gravatar_id":"","url":"https://api.github.com/users/hisui","html_url":"https://github.com/hisui","followers_url":"https://api.github.com/users/hisui/followers","following_url":"https://api.github.com/users/hisui/following{/other_user}","gists_url":"https://api.github.com/users/hisui/gists{/gist_id}","starred_url":"https://api.github.com/users/hisui/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hisui/subscriptions","organizations_url":"https://api.github.com/users/hisui/orgs","repos_url":"https://api.github.com/users/hisui/repos","events_url":"https://api.github.com/users/hisui/events{/privacy}","received_events_url":"https://api.github.com/users/hisui/received_events","type":"User","site_admin":false},"created_at":"2016-11-19T04:39:59Z","updated_at":"2016-11-19T04:39:59Z","body":"共変版の `Free` を `scalaz.Free` をラップするだけで簡単に実現できそうなので、それでやります〜〜"}}
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