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java.lang.AssertionError: isSubClass T at com.sun.tools.javac.code.Symbol.isSubClass(Symbol.java:447) at com.sun.tools.javac.code.Symbol.isMemberOf(Symbol.java:456) at com.sun.tools.javac.code.Symbol$MethodSymbol.overrides(Symbol.java:1469) at com.sun.tools.javac.code.Types$ImplementationCache.implementationInternal(Types.java:2671) at com.sun.tools.javac.code.Types$ImplementationCache.get(Types.java:2653) at com.sun.tools.javac.code.Types.implementation(Types.java:2682) at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1529) at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1518) at com.sun.tools.javac.comp.Resolve.notOverriddenIn(Resolve.java:416) at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:402) at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:362) at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1448) at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1618) at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1710) at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1662) at com.sun.tools.javac.comp.DeferredAttr$DeferredChecker$2.lookup(DeferredAttr.java:1325) at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3325) at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3310) at com.sun.tools.javac.comp.DeferredAttr$DeferredChecker.quicklyResolveMethod(DeferredAttr.java:1333) at com.sun.tools.javac.comp.DeferredAttr$DeferredChecker.visitApply(DeferredAttr.java:1223) at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465) at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49) at com.sun.tools.javac.comp.DeferredAttr$FilterScanner.scan(DeferredAttr.java:901) at com.sun.tools.javac.comp.DeferredAttr.isDeferred(DeferredAttr.java:1088) at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:701) at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1834) at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:656) at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1611) at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.visitForeachLoop(Attr.java:1207) at com.sun.tools.javac.tree.JCTree$JCEnhancedForLoop.accept(JCTree.java:1035) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1035) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4342) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4252) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4181) at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4156) at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248) at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901) at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860) at com.sun.tools.javac.main.Main.compile(Main.java:523) at com.sun.tools.javac.main.Main.compile(Main.java:381) at com.sun.tools.javac.main.Main.compile(Main.java:370) at com.sun.tools.javac.main.Main.compile(Main.java:361) at com.sun.tools.javac.Main.compile(Main.java:56) at com.sun.tools.javac.Main.main(Main.java:42)