{"action":"opened","issue":{"url":"https://api.github.com/repos/facebook/flow/issues/207","labels_url":"https://api.github.com/repos/facebook/flow/issues/207/labels{/name}","comments_url":"https://api.github.com/repos/facebook/flow/issues/207/comments","events_url":"https://api.github.com/repos/facebook/flow/issues/207/events","html_url":"https://github.com/facebook/flow/issues/207","id":53324398,"number":207,"title":"Maybe field type doesn't respect null check","user":{"login":"amasad","id":587518,"avatar_url":"https://avatars.githubusercontent.com/u/587518?v=3","gravatar_id":"","url":"https://api.github.com/users/amasad","html_url":"https://github.com/amasad","followers_url":"https://api.github.com/users/amasad/followers","following_url":"https://api.github.com/users/amasad/following{/other_user}","gists_url":"https://api.github.com/users/amasad/gists{/gist_id}","starred_url":"https://api.github.com/users/amasad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/amasad/subscriptions","organizations_url":"https://api.github.com/users/amasad/orgs","repos_url":"https://api.github.com/users/amasad/repos","events_url":"https://api.github.com/users/amasad/events{/privacy}","received_events_url":"https://api.github.com/users/amasad/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-01-04T04:00:12Z","updated_at":"2015-01-04T04:00:12Z","closed_at":null,"body":"\r\n```js\r\n/* @flow */\r\n \r\n// This works:\r\nclass Foo {\r\n  test(n: ?number): boolean {\r\n    if (n == null) {\r\n      return null;\r\n    } else {\r\n      return n > 10;\r\n    }\r\n  }\r\n}\r\n \r\n// This doesn't work:\r\nclass Foo {\r\n  n: ?number;\r\n \r\n  test(): boolean {\r\n    if (this.n == null) {\r\n      return false;\r\n    } else {\r\n      return this.n > 10;\r\n    }\r\n  }\r\n}\r\n```"}}