nullを使ったらコンパイル時にJVMをクラッシュさせる

https://github.com/xuwei-k/wartremover/commit/48046a


数日前だけど、なんとなく記念に貼っておく


以下のように死にます

https://travis-ci.org/xuwei-k/wartremover/jobs/123344695

[info] Compiling 32 Scala sources to /home/travis/build/xuwei-k/wartremover/core/target/scala-2.11/test-classes...
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f162afa8d24, pid=2420, tid=139731143538432
#
# JRE version: Java(TM) SE Runtime Environment (7.0_76-b13) (build 1.7.0_76-b13)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (24.76-b04 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V  [libjvm.so+0x97ad24]  Unsafe_GetNativeInt+0x74
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/travis/build/xuwei-k/wartremover/hs_err_pid2420.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
#