{"action":"created","issue":{"url":"https://api.github.com/repos/dart-lang/polymer-dart/issues/269","labels_url":"https://api.github.com/repos/dart-lang/polymer-dart/issues/269/labels{/name}","comments_url":"https://api.github.com/repos/dart-lang/polymer-dart/issues/269/comments","events_url":"https://api.github.com/repos/dart-lang/polymer-dart/issues/269/events","html_url":"https://github.com/dart-lang/polymer-dart/issues/269","id":85653517,"number":269,"title":"No warning in polymer.dart when attempting to extend elements implemented in JS","user":{"login":"DartBot","id":8958862,"avatar_url":"https://avatars.githubusercontent.com/u/8958862?v=3","gravatar_id":"","url":"https://api.github.com/users/DartBot","html_url":"https://github.com/DartBot","followers_url":"https://api.github.com/users/DartBot/followers","following_url":"https://api.github.com/users/DartBot/following{/other_user}","gists_url":"https://api.github.com/users/DartBot/gists{/gist_id}","starred_url":"https://api.github.com/users/DartBot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DartBot/subscriptions","organizations_url":"https://api.github.com/users/DartBot/orgs","repos_url":"https://api.github.com/users/DartBot/repos","events_url":"https://api.github.com/users/DartBot/events{/privacy}","received_events_url":"https://api.github.com/users/DartBot/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/dart-lang/polymer-dart/labels/bug","name":"bug","color":"fc2929"}],"state":"closed","locked":false,"assignee":{"login":"sigmundch","id":2049220,"avatar_url":"https://avatars.githubusercontent.com/u/2049220?v=3","gravatar_id":"","url":"https://api.github.com/users/sigmundch","html_url":"https://github.com/sigmundch","followers_url":"https://api.github.com/users/sigmundch/followers","following_url":"https://api.github.com/users/sigmundch/following{/other_user}","gists_url":"https://api.github.com/users/sigmundch/gists{/gist_id}","starred_url":"https://api.github.com/users/sigmundch/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sigmundch/subscriptions","organizations_url":"https://api.github.com/users/sigmundch/orgs","repos_url":"https://api.github.com/users/sigmundch/repos","events_url":"https://api.github.com/users/sigmundch/events{/privacy}","received_events_url":"https://api.github.com/users/sigmundch/received_events","type":"User","site_admin":false},"milestone":null,"comments":1,"created_at":"2015-06-05T23:09:17Z","updated_at":"2016-01-14T00:34:11Z","closed_at":"2016-01-14T00:34:11Z","body":"<a href=\"https://github.com/dgrove\"><img src=\"https://avatars.githubusercontent.com/u/2108507?v=3\" align=\"left\" width=\"96\" height=\"96\"hspace=\"10\"></img></a> **Issue by [dgrove](https://github.com/dgrove)**\n_Originally opened as dart-lang/sdk#20507_\n\n----\n\nWhen attempting to, for instance, do this:\n\n&lt;polymer-element name=&quot;my-paper-input&quot; extends=&quot;paper-input&quot;&gt;\n\nThere is no warning/error generated by polymer.dart, despite the fact that extending elements implemented in JS isn't supported."},"comment":{"url":"https://api.github.com/repos/dart-lang/polymer-dart/issues/comments/171484105","html_url":"https://github.com/dart-lang/polymer-dart/issues/269#issuecomment-171484105","issue_url":"https://api.github.com/repos/dart-lang/polymer-dart/issues/269","id":171484105,"user":{"login":"jakemac53","id":984921,"avatar_url":"https://avatars.githubusercontent.com/u/984921?v=3","gravatar_id":"","url":"https://api.github.com/users/jakemac53","html_url":"https://github.com/jakemac53","followers_url":"https://api.github.com/users/jakemac53/followers","following_url":"https://api.github.com/users/jakemac53/following{/other_user}","gists_url":"https://api.github.com/users/jakemac53/gists{/gist_id}","starred_url":"https://api.github.com/users/jakemac53/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jakemac53/subscriptions","organizations_url":"https://api.github.com/users/jakemac53/orgs","repos_url":"https://api.github.com/users/jakemac53/repos","events_url":"https://api.github.com/users/jakemac53/events{/privacy}","received_events_url":"https://api.github.com/users/jakemac53/received_events","type":"User","site_admin":false},"created_at":"2016-01-14T00:34:11Z","updated_at":"2016-01-14T00:34:11Z","body":"Extending any custom element is no longer supported by polymer"}}