SIGNAL doesn't compile for ARM processor (adafruit WICED feather)

[jbagleyjr]

Trying to run this on an adafruit WICED feather and the compiler doesn't like the SIGNAL.

test2:34:8: error: expected constructor, destructor, or type conversion before '(' token
SIGNAL(TIMER0_COMPA_vect) {
^

[dsb3]

Same error for Feather HUZZAH. I'm going to poke at it for a while to see if I can figure out what's wrong.

[wagemutig]

Same for me. Sad.