Currently when you print a stacktrace that show a call inside a lambda,
users can see the the frame corresponding to the method of the generated
proxy.

By example:
java.lang.Throwable
     StackTraceTest.lambda$0(StackTraceTest.java:6)
     StackTraceTest$$Lambda$1.run(Unknown Source) <--- ugly, isn't it
     StackTraceTest.main(StackTraceTest.java:8)

I think this line should not be visible to user, it doesn't provide
useful information,
just make the stack trace longer than it should.

A method can be marked hidden in a stack trace by using the annotation
LambdaFom.Hidden.

With ASM, one just have to add the following line:

mv.visitAnnotation("Ljava/lang/invoke/LambdaForm$Hidden;", true);

Submitted on behalf of Rémi Forax.