in src/main/scala-2.11+/org/apache/logging/log4j/scala/LoggerMacro.scala [332:336]
def logObjectThrowable(c: LoggerContext)(level: c.Expr[Level], message: c.Expr[AnyRef], cause: c.Expr[Throwable]) =
c.universe.reify(
if (c.prefix.splice.delegate.isEnabled(level.splice)) {
c.prefix.splice.logMessage(level.splice, null, message.splice, cause.splice)
}