skynet.call capture error

service/pingserver.lua

@@ -15,6 +15,10 @@ function command.EXIT()
 	skynet.exit()
 end
 
+function command.ERROR()
+	error "throw an error"
+end
+
 skynet.start(function()
 	skynet.dispatch("lua", function(session,addr, cmd, ...)
 		command[cmd](...)

service/testping.lua

@@ -3,6 +3,7 @@ local skynet = require "skynet"
 skynet.start(function()
 	local ps = skynet.uniqueservice("pingserver")
 	skynet.watch(ps)
+	print(pcall(skynet.call,ps,"lua","ERROR"))
 	print(skynet.call(ps, "lua", "PING", "hello"))
 	skynet.send(ps, "lua", "EXIT")
 	print(skynet.call(ps, "lua", "PING", "hay"))