Lambda doesn't compile under the latest JDK9

[jnape]

Compilation using the latest JDK is a disaster. Type inference and narrowing problems everywhere. These are likely all missed regressions in Java9, but I'll leave this issue open until I can get in touch with the OpenJDK guys and submit the likely myriad of bug reports necessary to bring it back to compilation parity with Java8.

[jnape]

Linked Java9 JDK bug: https://bugs.openjdk.java.net/browse/JDK-8188144

[jnape]

Well this is sad. That bug won't be fixed in Java9 (or 18.3 for that matter), and is postponed until Java10: http://mail.openjdk.java.net/pipermail/compiler-dev/2018-January/011577.html.

Have a serious think about whether this horribly buggy "short-term" Java release is worth even targeting for compilation, or if I should just leap frog it entirely.

[jnape]

Java9 is a disaster, both in terms of new compiler bugs and new runtime bugs. Lambda is particularly affected by these. Leapfrogging this unfortunate jdk release and targeting 10.