From Forum Nokia Wiki

Original (Russian): Отладка сброса (leave)

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Debugging Leave situations might be tedious. It would be much easier if the debugger could catch leaves and break the code execution. Luckily, there is a way to achieve it:

#define __LEAVE_IF_ERR(_c) TInt32 __reason = _c;       \
                           if (__reason < 0) {         \
                              __BREAKPOINT();          \
                              User::Leave(__reason);   \
	                   }

The usage of this macro is similar to using User::LeaveIfError(), e.g. __LEAVE_IF_ERR(iFs.Connect()).