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This bug was originally marked as duplicate of bug 268585, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 201711070002) VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27 OS: Mac OS X User Comments: GUEST: When I did format on a javascript source (experimental ECMA 7), I got this warning: A org.openide.util.RequestProcessor$SlowItem exception has occurred. Please report this at http://www.netbeans.org/community/issues.html, including a copy of your messages.log file as an attachment. The messages.log file is located in your /Users/willemjj/Library/Application Support/NetBeans/dev/var/log folder. Stacktrace: java.lang.AssertionError: FormatToken{kind=TEXT, offset=1656, text=<, id=OPERATOR_LOWER} from <NextArrow/> at org.netbeans.modules.javascript2.editor.formatter.JsFormatVisitor.enterJsxElementNode(JsFormatVisitor.java:177) at com.oracle.js.parser.ir.JsxElementNode.accept(JsxElementNode.java:83) at com.oracle.js.parser.ir.JsxAttributeNode.accept(JsxAttributeNode.java:68) at com.oracle.js.parser.ir.Node.accept(Node.java:280) at com.oracle.js.parser.ir.JsxElementNode.accept(JsxElementNode.java:85) at com.oracle.js.parser.ir.Node.accept(Node.java:280)
Created attachment 165412 [details] stacktrace