{"action":"opened","issue":{"url":"https://api.github.com/repos/Microsoft/TypeScript/issues/2153","labels_url":"https://api.github.com/repos/Microsoft/TypeScript/issues/2153/labels{/name}","comments_url":"https://api.github.com/repos/Microsoft/TypeScript/issues/2153/comments","events_url":"https://api.github.com/repos/Microsoft/TypeScript/issues/2153/events","html_url":"https://github.com/Microsoft/TypeScript/issues/2153","id":59102900,"number":2153,"title":"generics in interface definition of iterable data structures. ","user":{"login":"VbifRkbvjd","id":2067748,"avatar_url":"https://avatars.githubusercontent.com/u/2067748?v=3","gravatar_id":"","url":"https://api.github.com/users/VbifRkbvjd","html_url":"https://github.com/VbifRkbvjd","followers_url":"https://api.github.com/users/VbifRkbvjd/followers","following_url":"https://api.github.com/users/VbifRkbvjd/following{/other_user}","gists_url":"https://api.github.com/users/VbifRkbvjd/gists{/gist_id}","starred_url":"https://api.github.com/users/VbifRkbvjd/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/VbifRkbvjd/subscriptions","organizations_url":"https://api.github.com/users/VbifRkbvjd/orgs","repos_url":"https://api.github.com/users/VbifRkbvjd/repos","events_url":"https://api.github.com/users/VbifRkbvjd/events{/privacy}","received_events_url":"https://api.github.com/users/VbifRkbvjd/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-02-26T16:58:40Z","updated_at":"2015-02-26T16:58:40Z","closed_at":null,"body":"Example:\r\n```javascript\r\ninterface AnySet<T> {\r\n    [index:T]:boolean\r\n}\r\n```\r\nwill output  *\"error TS1023: An index signature parameter type must be 'string' or 'number'\"*, which is clearly  not an intended behaviour. \r\n"}}