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java.lang.AssertionError: isSubClass C 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$MethodSymbol.overrides(Symbol.java:1479) at com.sun.tools.javac.code.Types$ImplementationCache.implementationInternal(Types.java:2693) at com.sun.tools.javac.code.Types$ImplementationCache.get(Types.java:2675) at com.sun.tools.javac.code.Types.implementation(Types.java:2704) at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1539) at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1528) at com.sun.tools.javac.comp.Resolve.notOverriddenIn(Resolve.java:419) at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:405) at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:365) at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1457) at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1627) at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1719) at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1671) at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2424) at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3083) at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3334) at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2421) at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2415) at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2410) at com.sun.tools.javac.comp.Attr.checkAutoCloseable(Attr.java:1389) at com.sun.tools.javac.comp.Attr.visitTry(Attr.java:1335) at com.sun.tools.javac.tree.JCTree$JCTry.accept(JCTree.java:1173) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:651) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1114) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635) at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1003) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:566) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:635) at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4340) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4248) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4177) at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4152) 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)