In components tutorial, specifically in Using our Pawn and Components together the 3rd code snippets cites
// Create an instance of our movement component, and tell it to update the root.
MovementComponent = CreateDefaultSubobject<UCollidingPawnMovementComponent>(TEXT("CustomMovementComponent"));
MovementComponent->UpdatedComponent = RootComponent;
But the variable name it told us to create (and which is used in full code listing later on) is OurMovementComponent, so copy/pasting in this snippet will cause the application to not compile.