2 use system_error::SystemError;
17     ) -> Result<(), SystemError>;  in con_init()  argument
21     fn con_deinit(&self) -> Result<(), SystemError>;  in con_deinit()  argument
38     ) -> Result<(), SystemError>;  in con_clear()  argument
52     ) -> Result<(), SystemError>;  in con_putc()  argument
68     ) -> Result<(), SystemError>;  in con_putcs()  argument
77     ) -> Result<(usize, usize, usize), SystemError> {  in con_getxy()  argument
78         return Err(SystemError::ENOSYS);  in con_getxy()
106     ) -> Result<u8, SystemError> {  in con_build_attr()  argument
107         return Err(SystemError::ENOSYS);  in con_build_attr()
118     ) -> Result<(), SystemError>;  in con_set_palette()  argument