An error occurred during parsing of 'C:\Users\jprox\Documents\NetBeansProjects\JavaApplication12\src\pack\MyImpl.java'. Please report a bug against java/source and attach dump file 'C:\Users\jprox\AppData\Roaming\NetBeans\8.0\var\log\MyImpl_3.dump'.
Caused: java.lang.AssertionError: isSameType UNKNOWN
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitType(Types.java:1122)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitType(Types.java:1094)
   at com.sun.tools.javac.code.Type.accept(Type.java:174)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4430)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitClassType(Types.java:1142)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitClassType(Types.java:1094)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:763)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4430)
   at com.sun.tools.javac.code.Types.isSameType(Types.java:1086)
   at com.sun.tools.javac.code.Types.isSameTypes(Types.java:1054)
   at com.sun.tools.javac.code.Types.isSameTypes(Types.java:1050)
   at com.sun.tools.javac.comp.Attr.checkLambdaCompatible(Attr.java:2706)
   at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2509)
   at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:602)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:644)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1103)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:852)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:602)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:671)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4481)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4383)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4316)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4291)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1314)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1287)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:469)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:448)
   at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:664)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:519)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:174)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:615)
   at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:256)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:727)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)