1 - compiler.warn.incubating.modules: jdk.incubator.mvt
   2 - compiler.err.warnings.and.werror
   3 CheckIdentityHash01.java:13:25: compiler.warn.value.does.not.support: identityHashCode
   4 CheckIdentityHash01.java:14:25: compiler.warn.value.does.not.support: identityHashCode
   5 CheckIdentityHash01.java:17:32: compiler.warn.value.does.not.support: identityHashCode
   6 CheckIdentityHash01.java:18:32: compiler.warn.value.does.not.support: identityHashCode
   7 CheckIdentityHash01.java:20:32: compiler.warn.value.does.not.support: identityHashCode
   8 CheckIdentityHash01.java:21:32: compiler.warn.value.does.not.support: identityHashCode
   9 CheckIdentityHash01.java:23:42: compiler.warn.value.does.not.support: identityHashCode
  10 CheckIdentityHash01.java:24:42: compiler.warn.value.does.not.support: identityHashCode
  11 1 error
  12 9 warnings