{"action":"created","comment":{"url":"https://api.github.com/repos/tensorflow/haskell/pulls/comments/88955865","pull_request_review_id":9511328,"id":88955865,"diff_hunk":"@@ -24,6 +24,10 @@ library\n                 , lens-family\n                 , text\n   default-language:    Haskell2010\n+  -- Work around https://ghc.haskell.org/trac/ghc/ticket/12175.","path":"tensorflow-core-ops/tensorflow-core-ops.cabal","position":4,"original_position":4,"commit_id":"33683ffbcf36dfcdbd6d9c0928ab2ace4c6f6346","original_commit_id":"33683ffbcf36dfcdbd6d9c0928ab2ace4c6f6346","user":{"login":"blackgnezdo","id":8768818,"avatar_url":"https://avatars.githubusercontent.com/u/8768818?v=3","gravatar_id":"","url":"https://api.github.com/users/blackgnezdo","html_url":"https://github.com/blackgnezdo","followers_url":"https://api.github.com/users/blackgnezdo/followers","following_url":"https://api.github.com/users/blackgnezdo/following{/other_user}","gists_url":"https://api.github.com/users/blackgnezdo/gists{/gist_id}","starred_url":"https://api.github.com/users/blackgnezdo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/blackgnezdo/subscriptions","organizations_url":"https://api.github.com/users/blackgnezdo/orgs","repos_url":"https://api.github.com/users/blackgnezdo/repos","events_url":"https://api.github.com/users/blackgnezdo/events{/privacy}","received_events_url":"https://api.github.com/users/blackgnezdo/received_events","type":"User","site_admin":false},"body":"Presumably this is only needed for < 8.0.2? Or am I misreading the bug report?","created_at":"2016-11-21T18:23:32Z","updated_at":"2016-11-21T18:25:53Z","html_url":"https://github.com/tensorflow/haskell/pull/40#discussion_r88955865","pull_request_url":"https://api.github.com/repos/tensorflow/haskell/pulls/40","_links":{"self":{"href":"https://api.github.com/repos/tensorflow/haskell/pulls/comments/88955865"},"html":{"href":"https://github.com/tensorflow/haskell/pull/40#discussion_r88955865"},"pull_request":{"href":"https://api.github.com/repos/tensorflow/haskell/pulls/40"}}},"pull_request":{"url":"https://api.github.com/repos/tensorflow/haskell/pulls/40","id":94661250,"html_url":"https://github.com/tensorflow/haskell/pull/40","diff_url":"https://github.com/tensorflow/haskell/pull/40.diff","patch_url":"https://github.com/tensorflow/haskell/pull/40.patch","issue_url":"https://api.github.com/repos/tensorflow/haskell/issues/40","number":40,"state":"open","locked":false,"title":"Fix the build on ghc-8.0.1 (#38).","user":{"login":"judah","id":49143,"avatar_url":"https://avatars.githubusercontent.com/u/49143?v=3","gravatar_id":"","url":"https://api.github.com/users/judah","html_url":"https://github.com/judah","followers_url":"https://api.github.com/users/judah/followers","following_url":"https://api.github.com/users/judah/following{/other_user}","gists_url":"https://api.github.com/users/judah/gists{/gist_id}","starred_url":"https://api.github.com/users/judah/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/judah/subscriptions","organizations_url":"https://api.github.com/users/judah/orgs","repos_url":"https://api.github.com/users/judah/repos","events_url":"https://api.github.com/users/judah/events{/privacy}","received_events_url":"https://api.github.com/users/judah/received_events","type":"User","site_admin":false},"body":"Two issues:\r\n- The definition of `\\\\` was missing parentheses.  It was probably a bug\r\n  that this used to worked in ghc-7.10.\r\n- Set -fconstraint-solver-iterations=0 to work around\r\n  https://ghc.haskell.org/trac/ghc/ticket/12175.  It looks like we can\r\n  trigger that bug when defining a significantly complicated op.  Specifically,\r\n  our type shenanigans (\"OneOf\") along with lens setters (for OpDef) seem\r\n  to confuse GHC.\r\n\r\nStill TODO: automate testing of different ghc versions to prevent a 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