Effing Xcode

[zhiva]

I need to subclass an abstract class. As I was implementing one of abstract class methods in my derived class, Xcode put a red error mark on "void Listener::BeginContact(b2Contact* c)" line, telling me there are three errors. I double checked my spelling and syntax and found no errors, so I clicked on error mark to see error descriptions. Xcode crashed.

When I restarted Xcode, error mark was still there. I clicked on it and Xcode crashed.

I restarted Xcode, deleted project's derived data, restarted Xcode again. Error mark was still there. I clicked on it and Xcode crashed.

I restarted Xcode, built the project (clean) - error mark was still there. I did the clean build again - and error mark was gone. W. T. F.