I've been trying to get the blink sketch running on a Trinket M0 but have so far been unsuccessful. Output from pin 1 is buffered to through a 1g126 to 5V. The same setup works just fine with the Neopixel library.

I have a picoprobe SWD hooked up to it and it's not stuck or in hardfault. I'm not sure what to look at to debug this issue.