While compiling a block of code which complies correctly for an UNO or ProMicro for the Teensy 3.5, I get the following error (highlighted at the end):
Arduino: 1.8.5 (Windows 7), TD: 1.41, Board: "Teensy 3.5, Serial, 120 MHz, Faster, US English"
C:\Program Files (x86)\Arduino\arduino-builder...