{"action":"closed","issue":{"url":"https://api.github.com/repos/coq/coq/issues/7586","repository_url":"https://api.github.com/repos/coq/coq","labels_url":"https://api.github.com/repos/coq/coq/issues/7586/labels{/name}","comments_url":"https://api.github.com/repos/coq/coq/issues/7586/comments","events_url":"https://api.github.com/repos/coq/coq/issues/7586/events","html_url":"https://github.com/coq/coq/issues/7586","id":325621275,"node_id":"MDU6SXNzdWUzMjU2MjEyNzU=","number":7586,"title":"Error: Anomaly \"Uncaught exception Not_found\" with existential variables","user":{"login":"jad-hamza","id":2743954,"node_id":"MDQ6VXNlcjI3NDM5NTQ=","avatar_url":"https://avatars0.githubusercontent.com/u/2743954?v=4","gravatar_id":"","url":"https://api.github.com/users/jad-hamza","html_url":"https://github.com/jad-hamza","followers_url":"https://api.github.com/users/jad-hamza/followers","following_url":"https://api.github.com/users/jad-hamza/following{/other_user}","gists_url":"https://api.github.com/users/jad-hamza/gists{/gist_id}","starred_url":"https://api.github.com/users/jad-hamza/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jad-hamza/subscriptions","organizations_url":"https://api.github.com/users/jad-hamza/orgs","repos_url":"https://api.github.com/users/jad-hamza/repos","events_url":"https://api.github.com/users/jad-hamza/events{/privacy}","received_events_url":"https://api.github.com/users/jad-hamza/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":7,"created_at":"2018-05-23T09:24:54Z","updated_at":"2018-06-04T12:06:29Z","closed_at":"2018-06-04T12:06:29Z","author_association":"NONE","body":"#### Version\r\n\r\n8.8.0\r\n\r\n#### Operating system\r\n\r\nDebian\r\n\r\n#### Description of the problem\r\n\r\nMaybe a duplicate of https://github.com/coq/coq/issues/7392\r\n\r\n```Coq\r\nRequire Import Coq.Lists.List.\r\n\r\nParameter term: Set.\r\n\r\nInductive relation: list nat -> term -> Prop :=\r\n| ER: forall l t S,\r\n    (forall x: nat, ~In x S -> relation l t) ->\r\n    relation l t\r\n.\r\n\r\nInductive relation2: nat -> Prop :=\r\n| ER2: forall n,\r\n    relation2 n ->\r\n    relation2 (S n)\r\n.\r\n\r\nLemma l:\r\n  forall l t,\r\n    relation l t ->\r\n    forall n l',\r\n      relation2 n ->\r\n      relation l' t.\r\nProof.\r\n  induction 1; intuition.\r\n  - apply ER with (l' ++ S); intuition.\r\n    eapply H0.\r\n    + admit.\r\n    + intuition.\r\n      rewrite in_app_iff in *.\r\n      intuition.\r\n      apply ER2.\r\n      simpl in *. (* Error: Anomaly \"Uncaught exception Not_found.\" *)\r\n```"}}
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