it will print some wrong stack when use pr_stacktrace() with unicode thing

[zsbxp]

try throw("测试") catch Class:Reason -> lager:info("get_stacktrace:~n~tp", [lager:pr_stacktrace(erlang:get_stacktrace(), {Class, Reason})]) end.

In our system, the exception will throw with some Chinese word sometimes. If that happen, it will print like this: lager_trunc_io:print/3 line 269 lager_trunc_io:list_body/4 line 312 lager_trunc_io:list_bodyc/4 line 324 lager_trunc_io:list_bodyc/4 line 323 lager_trunc_io:print/3 line 168 lager_trunc_io:alist/3 line 421 lager_trunc_io:alist/3 line 421 lager_trunc_io:alist/3 line 448

and can not get back the stack really happened