After merging (https://github.com/openjdk/valhalla/pull/316) the following error occurs:

test LambdaConversion.test(): failure
java.lang.InternalError: java.lang.ClassFormatError: Illegal class name "QLambdaConversion$Pointer;" in class file LambdaConversion$$Lambda$19
at java.base/java.lang.invoke.InnerClassLambdaMetafactory.generateInnerClass(InnerClassLambdaMetafactory.java:415)
at java.base/java.lang.invoke.InnerClassLambdaMetafactory.spinInnerClass(InnerClassLambdaMetafactory.java:304)
at java.base/java.lang.invoke.InnerClassLambdaMetafactory.buildCallSite(InnerClassLambdaMetafactory.java:218)
at java.base/java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:328)
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:127)
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:315)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:281)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:271)
at LambdaConversion.test(LambdaConversion.java:53)

Maybe same root cause as: JDK-8261019