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Compile warning: negative left shifts
home/user/.arduino15/packages/XMegaForArduino/hardware/avr/0.9.2/cores/xmega/HardwareSerial.cpp: In function 'uint16_t temp_get_baud(long unsigned int, uint8_t)': /home/user/.arduino15/packages/XMegaForArduino/hardware/avr/0.9.2/cores/xmega/HardwareSerial.cpp:1063:20: warning: left shift of negative value [-Wshift-negative-value] (uint16_t)(-1 << 12) | 137, // 57600
It goes on several lines.