{"action":"opened","issue":{"url":"https://api.github.com/repos/crystal-lang/crystal/issues/7177","repository_url":"https://api.github.com/repos/crystal-lang/crystal","labels_url":"https://api.github.com/repos/crystal-lang/crystal/issues/7177/labels{/name}","comments_url":"https://api.github.com/repos/crystal-lang/crystal/issues/7177/comments","events_url":"https://api.github.com/repos/crystal-lang/crystal/issues/7177/events","html_url":"https://github.com/crystal-lang/crystal/issues/7177","id":389755151,"node_id":"MDU6SXNzdWUzODk3NTUxNTE=","number":7177,"title":"symbol lookup error","user":{"login":"Exilor","id":5578107,"node_id":"MDQ6VXNlcjU1NzgxMDc=","avatar_url":"https://avatars1.githubusercontent.com/u/5578107?v=4","gravatar_id":"","url":"https://api.github.com/users/Exilor","html_url":"https://github.com/Exilor","followers_url":"https://api.github.com/users/Exilor/followers","following_url":"https://api.github.com/users/Exilor/following{/other_user}","gists_url":"https://api.github.com/users/Exilor/gists{/gist_id}","starred_url":"https://api.github.com/users/Exilor/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Exilor/subscriptions","organizations_url":"https://api.github.com/users/Exilor/orgs","repos_url":"https://api.github.com/users/Exilor/repos","events_url":"https://api.github.com/users/Exilor/events{/privacy}","received_events_url":"https://api.github.com/users/Exilor/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-12-11T13:05:34Z","updated_at":"2018-12-11T13:05:34Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"After compiling successfully with 0.27 and LLVM 4.0.0 (Ubuntu on the WSL) running the executable gives this error:\r\n```./game_server: symbol lookup error: ./game_server: undefined symbol: errno, version Object::to_s<String::Builder>:String::Builder```.\r\nThe specific method referenced can change between computers (computers that were able to run the executables before this error appeared).\r\n\r\nUnfortunately I can't provide code to reproduce because the program has over 150k lines. I'm trying to comment out code in the hopes of narrowing down where this comes from.\r\n\r\nThe problem doesn't happen if I compile with ```--single-module``` or in MacOS.\r\n\r\nIt's not much to go on but does anyone have an inkling of where this could be coming from?"}}
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