Suppose we're calling the Win32Declarations.SendMessage with (IntPtr, WindowsMessages, int, IntPtr) and want to hit the (IntPtr, WindowsMessages, IntPtr, IntPtr) signature. The QFixes suggested on the non-resolved method call suggest fixing only the second argument and won't go into the third, so you can never reach the desired signature via qfixes. Errors must be on each argument separately and quickfixes should suggest fixing