Proguard fails with lambdas

[NightRa]

For every lambda usage, proguard reports:

Warning: fj.F1Functions: can't find referenced class java.lang.invoke.MethodHandles$Lookup
Warning: fj.F1Functions: can't find referenced class java.lang.invoke.MethodHandles

(fj.F1Functions as an example)
As a note, I'm on using it on android.

[evant]

I think it's safe to just ignore those warnings, try adding -dontwarn java.lang.invoke** to your progurad config. (this is probably something I should add to the README)

[evant]

I added a section in the README explaining this, let me know if you have any other issues using proguard.