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java.lang.NullPointerException: 	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.retype(TransTypes.java:159)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.visitApply(TransTypes.java:604)	at com.redhat.ceylon.langtools.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1323)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.translate(TransTypes.java:428)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.visitExec(TransTypes.java:567)	at com.redhat.ceylon.langtools.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1169)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:160)	at com.redhat.ceylon.langtools.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:783)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.translate(TransTypes.java:428)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.visitMethodDef(TransTypes.java:462)	at com.redhat.ceylon.langtools.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:671)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:134)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.translateClass(TransTypes.java:889)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.visitClassDef(TransTypes.java:449)	at com.redhat.ceylon.langtools.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:593)	at com.redhat.ceylon.langtools.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.translate(TransTypes.java:428)	at com.redhat.ceylon.langtools.tools.javac.comp.TransTypes.translateTopLevelClass(TransTypes.java:916)	at com.redhat.ceylon.langtools.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1374)	at com.redhat.ceylon.compiler.java.tools.LanguageCompiler.desugar(LanguageCompiler.java:823)	at com.redhat.ceylon.langtools.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1270)	at com.redhat.ceylon.langtools.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:869)	at com.redhat.ceylon.langtools.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:827)	at com.redhat.ceylon.compiler.java.tools.LanguageCompiler.compile(LanguageCompiler.java:256)	at com.redhat.ceylon.compiler.java.launcher.Main.compile(Main.java:663)	at com.redhat.ceylon.compiler.java.launcher.Main.compile(Main.java:579)	at com.redhat.ceylon.compiler.java.launcher.Main.compile(Main.java:569)	at com.redhat.ceylon.compiler.CeylonCompileTool.run(CeylonCompileTool.java:550)	at com.redhat.ceylon.common.tools.CeylonTool.run(CeylonTool.java:520)	at com.redhat.ceylon.common.tools.CeylonTool.execute(CeylonTool.java:405)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.redhat.ceylon.launcher.Launcher.runInJava7Checked(Launcher.java:115)	at com.redhat.ceylon.launcher.Launcher.run(Launcher.java:41)	at com.redhat.ceylon.launcher.Launcher.run(Launcher.java:34)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.redhat.ceylon.launcher.Bootstrap.run(Bootstrap.java:126)	at com.redhat.ceylon.launcher.Bootstrap.main(Bootstrap.java:76)