ATtiny85 Interrupt code

Projects Programming
10

Compiles thus

void setup() 
{
  pinMode(3, OUTPUT);
  digitalWrite(3, LOW);
  attachInterrupt(sensePin,pumpOn,FALLING);
}

Maybe digitalPinToInterrupt hasn't been incorporated into the '85 core.
I don't know what that's supposed to accomplish. (It wasn't around the only time I did with an Interrupt (10 years ago).)