{"action":"created","issue":{"url":"https://api.github.com/repos/dart-lang/sdk/issues/23606","labels_url":"https://api.github.com/repos/dart-lang/sdk/issues/23606/labels{/name}","comments_url":"https://api.github.com/repos/dart-lang/sdk/issues/23606/comments","events_url":"https://api.github.com/repos/dart-lang/sdk/issues/23606/events","html_url":"https://github.com/dart-lang/sdk/issues/23606","id":86214316,"number":23606,"title":"Invalid warning when using an empty mixin","user":{"login":"bwilkerson","id":5840555,"avatar_url":"https://avatars.githubusercontent.com/u/5840555?v=3","gravatar_id":"","url":"https://api.github.com/users/bwilkerson","html_url":"https://github.com/bwilkerson","followers_url":"https://api.github.com/users/bwilkerson/followers","following_url":"https://api.github.com/users/bwilkerson/following{/other_user}","gists_url":"https://api.github.com/users/bwilkerson/gists{/gist_id}","starred_url":"https://api.github.com/users/bwilkerson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bwilkerson/subscriptions","organizations_url":"https://api.github.com/users/bwilkerson/orgs","repos_url":"https://api.github.com/users/bwilkerson/repos","events_url":"https://api.github.com/users/bwilkerson/events{/privacy}","received_events_url":"https://api.github.com/users/bwilkerson/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/dart-lang/sdk/labels/Area-Analyzer","name":"Area-Analyzer","color":"ededed"},{"url":"https://api.github.com/repos/dart-lang/sdk/labels/Priority-High","name":"Priority-High","color":"ededed"},{"url":"https://api.github.com/repos/dart-lang/sdk/labels/Type-Defect","name":"Type-Defect","color":"ededed"}],"state":"closed","locked":false,"assignee":{"login":"bwilkerson","id":5840555,"avatar_url":"https://avatars.githubusercontent.com/u/5840555?v=3","gravatar_id":"","url":"https://api.github.com/users/bwilkerson","html_url":"https://github.com/bwilkerson","followers_url":"https://api.github.com/users/bwilkerson/followers","following_url":"https://api.github.com/users/bwilkerson/following{/other_user}","gists_url":"https://api.github.com/users/bwilkerson/gists{/gist_id}","starred_url":"https://api.github.com/users/bwilkerson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bwilkerson/subscriptions","organizations_url":"https://api.github.com/users/bwilkerson/orgs","repos_url":"https://api.github.com/users/bwilkerson/repos","events_url":"https://api.github.com/users/bwilkerson/events{/privacy}","received_events_url":"https://api.github.com/users/bwilkerson/received_events","type":"User","site_admin":false},"milestone":{"url":"https://api.github.com/repos/dart-lang/sdk/milestones/29","html_url":"https://github.com/dart-lang/sdk/milestones/1.12","labels_url":"https://api.github.com/repos/dart-lang/sdk/milestones/29/labels","id":1155671,"number":29,"title":"1.12","description":"","creator":{"login":"bwilkerson","id":5840555,"avatar_url":"https://avatars.githubusercontent.com/u/5840555?v=3","gravatar_id":"","url":"https://api.github.com/users/bwilkerson","html_url":"https://github.com/bwilkerson","followers_url":"https://api.github.com/users/bwilkerson/followers","following_url":"https://api.github.com/users/bwilkerson/following{/other_user}","gists_url":"https://api.github.com/users/bwilkerson/gists{/gist_id}","starred_url":"https://api.github.com/users/bwilkerson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bwilkerson/subscriptions","organizations_url":"https://api.github.com/users/bwilkerson/orgs","repos_url":"https://api.github.com/users/bwilkerson/repos","events_url":"https://api.github.com/users/bwilkerson/events{/privacy}","received_events_url":"https://api.github.com/users/bwilkerson/received_events","type":"User","site_admin":false},"open_issues":37,"closed_issues":5,"state":"open","created_at":"2015-06-08T20:05:56Z","updated_at":"2015-07-01T16:42:58Z","due_on":null,"closed_at":null},"comments":3,"created_at":"2015-06-08T15:07:32Z","updated_at":"2015-07-01T16:42:58Z","closed_at":"2015-07-01T16:42:58Z","body":"Enter the following code in a Dart file:\r\n\r\n    class A {\r\n      String toString([String prefix = '']) {\r\n        return '${prefix}Hello';\r\n      }\r\n    }\r\n\r\n    class C { }\r\n\r\n    class B extends A with C { } // Missing concrete implementation of 'A.toString'\r\n\r\n    void main() {\r\n      B b = new B();\r\n      print('$b');\r\n    }\r\n\r\nThere should not be any warnings, but the warning noted above is produced."},"comment":{"url":"https://api.github.com/repos/dart-lang/sdk/issues/comments/117744128","html_url":"https://github.com/dart-lang/sdk/issues/23606#issuecomment-117744128","issue_url":"https://api.github.com/repos/dart-lang/sdk/issues/23606","id":117744128,"user":{"login":"bwilkerson","id":5840555,"avatar_url":"https://avatars.githubusercontent.com/u/5840555?v=3","gravatar_id":"","url":"https://api.github.com/users/bwilkerson","html_url":"https://github.com/bwilkerson","followers_url":"https://api.github.com/users/bwilkerson/followers","following_url":"https://api.github.com/users/bwilkerson/following{/other_user}","gists_url":"https://api.github.com/users/bwilkerson/gists{/gist_id}","starred_url":"https://api.github.com/users/bwilkerson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bwilkerson/subscriptions","organizations_url":"https://api.github.com/users/bwilkerson/orgs","repos_url":"https://api.github.com/users/bwilkerson/repos","events_url":"https://api.github.com/users/bwilkerson/events{/privacy}","received_events_url":"https://api.github.com/users/bwilkerson/received_events","type":"User","site_admin":false},"created_at":"2015-07-01T16:42:58Z","updated_at":"2015-07-01T16:42:58Z","body":"773c0cfc14022a2569583bde05ec20e877ef7826 (presubmit successful).\r\n\r\nhttps://codereview.chromium.org/1216393002/"}}