--[[
s,e=string.find("hello Lua users","Lua")
print(s,e)
--]]

function maximum (a)
   local mi = l
   local m = a[mi]
   for i,val in ipairs(a) do
      if val > m then
         mi = i
         m = val
      end
   end
   return m,mi  
end

print(maximum({8,10,23,12,5}))

报错：
Exception in thread "main" com.naef.jnlua.LuaRuntimeException: ...\ldt\workspace\test\src\5.1return multiple value.lua:10: attempt to compare nil with number at com.naef.jnlua.LuaState.lua_pcall(Native Method) at com.naef.jnlua.LuaState.call(LuaState.java:555) at org.eclipse.koneki.ldt.support.lua51.internal.interpreter.JNLua51Launcher.run(JNLua51Launcher.java:128) at org.eclipse.koneki.ldt.support.lua51.internal.interpreter.JNLua51Launcher.main(JNLua51Launcher.java:143)