File: test.js

print((x=>x+1)(33))

Output:

Exception in thread "main" java.lang.ClassFormatError: Illegal method name "=>:1" in class jdk/nashorn/internal/scripts/Script$Recompilation$2$7I$test
        at java.lang.ClassLoader.defineClass1(java.base@9-internal/Native Method)
        at java.lang.ClassLoader.defineClass(java.base@9-internal/ClassLoader.java:942)
        at java.security.SecureClassLoader.defineClass(java.base@9-internal/SecureClassLoader.java:152)
        at jdk.nashorn.internal.runtime.ScriptLoader.installClass(jdk.scripting.nashorn@9-internal/ScriptLoader.java:102)
        at jdk.nashorn.internal.runtime.Context$NamedContextCodeInstaller.install(jdk.scripting.nashorn@9-internal/Context.java:286)
        at jdk.nashorn.internal.codegen.CompilationPhase$InstallPhase.transform(jdk.scripting.nashorn@9-internal/CompilationPhase.java:501)
        at jdk.nashorn.internal.codegen.CompilationPhase.apply(jdk.scripting.nashorn@9-internal/CompilationPhase.java:630)
        at jdk.nashorn.internal.codegen.Compiler.compile(jdk.scripting.nashorn@9-internal/Compiler.java:656)
        at jdk.nashorn.internal.runtime.RecompilableScriptFunctionData.compileTypeSpecialization(jdk.scripting.nashorn@9-internal/RecompilableScriptFunctionData.java:717)
        at jdk.nashorn.internal.runtime.RecompilableScriptFunctionData.getBest(jdk.scripting.nashorn@9-internal/RecompilableScriptFunctionData.java:897)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.getBest(jdk.scripting.nashorn@9-internal/ScriptFunctionData.java:392)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.getBestInvoker(jdk.scripting.nashorn@9-internal/ScriptFunctionData.java:254)
        at jdk.nashorn.internal.runtime.ScriptFunction.findCallMethod(jdk.scripting.nashorn@9-internal/ScriptFunction.java:917)
        at jdk.nashorn.internal.runtime.ScriptObject.lookup(jdk.scripting.nashorn@9-internal/ScriptObject.java:1861)
        at jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardedInvocation(jdk.scripting.nashorn@9-internal/NashornLinker.java:104)
        at jdk.nashorn.internal.runtime.linker.NashornLinker.getGuardedInvocation(jdk.scripting.nashorn@9-internal/NashornLinker.java:96)
        at jdk.dynalink.linker.support.CompositeTypeBasedGuardingDynamicLinker.getGuardedInvocation(jdk.dynalink@9-internal/CompositeTypeBasedGuardingDynamicLinker.java:184)
        at jdk.dynalink.linker.support.CompositeGuardingDynamicLinker.getGuardedInvocation(jdk.dynalink@9-internal/CompositeGuardingDynamicLinker.java:132)
        at jdk.dynalink.LinkerServicesImpl.lambda$getGuardedInvocation$0(jdk.dynalink@9-internal/LinkerServicesImpl.java:160)
        at jdk.dynalink.LinkerServicesImpl.getWithLookupInternal(jdk.dynalink@9-internal/LinkerServicesImpl.java:191)
        at jdk.dynalink.LinkerServicesImpl.getGuardedInvocation(jdk.dynalink@9-internal/LinkerServicesImpl.java:158)
        at jdk.dynalink.DynamicLinker.relink(jdk.dynalink@9-internal/DynamicLinker.java:262)
        at jdk.nashorn.internal.scripts.Script$Recompilation$1$test.:program(jdk.scripting.nashorn.scripts/test.js:1)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(jdk.scripting.nashorn@9-internal/ScriptFunctionData.java:654)
        at jdk.nashorn.internal.runtime.ScriptFunction.invoke(jdk.scripting.nashorn@9-internal/ScriptFunction.java:513)
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(jdk.scripting.nashorn@9-internal/ScriptRuntime.java:471)
        at jdk.nashorn.tools.Shell.apply(jdk.scripting.nashorn@9-internal/Shell.java:519)
        at jdk.nashorn.tools.Shell.runScripts(jdk.scripting.nashorn@9-internal/Shell.java:448)
        at jdk.nashorn.tools.Shell.run(jdk.scripting.nashorn@9-internal/Shell.java:186)