一直发现 mono 的 traceback 没有 fliename、lineno，很奇怪。研究了下，原来编译和运行时要加参数的。
dmcs -debug /r:xunit.dll /t:library MyTest.cs
mono --debug xunit.console.exe MyTest.dll
MyTest.FooTest [FAIL]
Assert.Equal() Failure
Expected: 4
Actual: 3
Stack Trace:
at MyTest.FooTest () [0x00000] in /Users/kasicass/sandbox/csharp/mytest/MyTest.cs:8
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x000d0] in /private/tmp/monobuild/build/BUILD/mono-2.10.8/mcs/class/corlib/System.Reflection/MonoMethod.cs:226