{"action":"created","comment":{"url":"https://api.github.com/repos/scala-js/scala-js/pulls/comments/33187506","id":33187506,"diff_hunk":"@@ -386,6 +390,13 @@ final class ScalaJSClassEmitter(semantics: Semantics, outputMode: OutputMode,\n     case StringLiteral(value) => js.StringLiteral(value)(name.pos)\n   }\n \n+  private[tools] def needInstanceTests(tree: LinkedClass): Boolean = {\n+    tree.hasInstanceTests || {\n+      tree.hasRuntimeTypeInfo &&\n+      ClassesWhoseDataReferToTheirInstanceTests.contains(tree.encodedName)\n+    }\n+  }\n+","path":"tools/shared/src/main/scala/org/scalajs/core/tools/javascript/ScalaJSClassEmitter.scala","position":39,"original_position":39,"commit_id":"f49c3ae48809206fef15f67f26245ff8768c4cc7","original_commit_id":"f49c3ae48809206fef15f67f26245ff8768c4cc7","user":{"login":"sjrd","id":535934,"avatar_url":"https://avatars.githubusercontent.com/u/535934?v=3","gravatar_id":"","url":"https://api.github.com/users/sjrd","html_url":"https://github.com/sjrd","followers_url":"https://api.github.com/users/sjrd/followers","following_url":"https://api.github.com/users/sjrd/following{/other_user}","gists_url":"https://api.github.com/users/sjrd/gists{/gist_id}","starred_url":"https://api.github.com/users/sjrd/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sjrd/subscriptions","organizations_url":"https://api.github.com/users/sjrd/orgs","repos_url":"https://api.github.com/users/sjrd/repos","events_url":"https://api.github.com/users/sjrd/events{/privacy}","received_events_url":"https://api.github.com/users/sjrd/received_events","type":"User","site_admin":false},"body":"Or, also likely, the `OutputMode`.","created_at":"2015-06-24T19:46:17Z","updated_at":"2015-06-24T19:46:17Z","html_url":"https://github.com/scala-js/scala-js/pull/1757#discussion_r33187506","pull_request_url":"https://api.github.com/repos/scala-js/scala-js/pulls/1757","_links":{"self":{"href":"https://api.github.com/repos/scala-js/scala-js/pulls/comments/33187506"},"html":{"href":"https://github.com/scala-js/scala-js/pull/1757#discussion_r33187506"},"pull_request":{"href":"https://api.github.com/repos/scala-js/scala-js/pulls/1757"}}},"pull_request":{"url":"https://api.github.com/repos/scala-js/scala-js/pulls/1757","id":38424259,"html_url":"https://github.com/scala-js/scala-js/pull/1757","diff_url":"https://github.com/scala-js/scala-js/pull/1757.diff","patch_url":"https://github.com/scala-js/scala-js/pull/1757.patch","issue_url":"https://api.github.com/repos/scala-js/scala-js/issues/1757","number":1757,"state":"open","locked":false,"title":"Fix #1756: Use the linking info in ScalaJSClassEmitter.","user":{"login":"sjrd","id":535934,"avatar_url":"https://avatars.githubusercontent.com/u/535934?v=3","gravatar_id":"","url":"https://api.github.com/users/sjrd","html_url":"https://github.com/sjrd","followers_url":"https://api.github.com/users/sjrd/followers","following_url":"https://api.github.com/users/sjrd/following{/other_user}","gists_url":"https://api.github.com/users/sjrd/gists{/gist_id}","starred_url":"https://api.github.com/users/sjrd/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sjrd/subscriptions","organizations_url":"https://api.github.com/users/sjrd/orgs","repos_url":"https://api.github.com/users/sjrd/repos","events_url":"https://api.github.com/users/sjrd/events{/privacy}","received_events_url":"https://api.github.com/users/sjrd/received_events","type":"User","site_admin":false},"body":"The issue was caused by the following pattern:\r\n\r\n```scala\r\nclass A\r\nclass B extends A\r\nprintln(classOf[B])\r\n```\r\n\r\nIn this case, `B` is retained by the linker because its runtime type info are required. But `A` is discarded because it is not used in any way, despite it being a superclass of `B`. This is normal.\r\n\r\nThe problem is that the Rhino runner, when lazy loading `B`, did not use the fact that `linkedClassB.hasInstances` is false, and therefore generated the (empty) class. This empty class *did*\r\nreference its parent class `A`, so when the script was evaluated, it would look for `A`. However it could not find `A` at all because it has been completely eliminated by the linker.\r\n\r\nThis commit fixes this by making `ScalaJSClassEmitter` leverage the linking info available in the `LinkedClass` it prints to emit only the necessary parts, basically with the same tests as those used\r\nby 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