did some experiments: switched
: no error. So my MySensors version seems to be okay.
And then I changed the #warning in MyConfig.h into an #error and that actually did throw an error.
So maybe it's got to do with warning levels? We are just not being displayed the warnings?
And that's when I had a look at the settings for my Arduino IDE and found "none" for compiler warnings.
And that was it
"Your monkey's got it right"