If errno is 0, it's definitely no proividing anything of value here. Of
course, sometimes errno might be non-zero and still be unrelated to the error
message. <shrug>

For Nelgin:
!ERROR 0 (Success) in exec.cpp line 644 (js_execfile) compiling "something.js" access=0
<nelgin> I don't quite get why a successful execution is logged as an error