Erlang：函数调用返回的构造的情况？

代码生成的错误如下所示：

2> X = "2".
"2"
3> case_:main(X).
main 50
sender 50
** exception error: bad argument
     in function  case_:sender/1 (case_.erl, line 14)
     in call from case_:main/1 (case_.erl, line 6)
4> Z = 2.
2
5> case_:main(Z).
** exception error: bad argument
     in function  io:format/3
        called as io:format(<0.25.0>,"main ~p~n",2)
     in call from case_:main/1 (case_.erl, line 5)
6> 

---

幸运的是，badarg修复很容易完成。将术语列表作为第二个参数。见：

(Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.9.2  (abort with ^G)
1> io:format("main ~p~n", 2).
** exception error: bad argument
     in function  io:format/3
        called as io:format(<0.24.0>,"main ~p~n",2)
2> io:format("main ~p~n", [2]).
main 2
ok

然后，repl中的交互：

Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.9.2  (abort with ^G)
1> c("case_").
{ok,case_}
2> case_:main(2).
main 2
sender 2
receiver 
Received 4
ok

---

幸运的是，badarg修复很容易完成。将术语列表作为第二个参数。见：

(Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.9.2  (abort with ^G)
1> io:format("main ~p~n", 2).
** exception error: bad argument
     in function  io:format/3
        called as io:format(<0.24.0>,"main ~p~n",2)
2> io:format("main ~p~n", [2]).
main 2
ok

然后，repl中的交互：

Erlang R15B02 (erts-5.9.2) [source] [64-bit] [smp:8:8] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.9.2  (abort with ^G)
1> c("case_").
{ok,case_}
2> case_:main(2).
main 2
sender 2
receiver 
Received 4
ok