Aalt export warning that looks correct

1

Hi,
On checking my export log I see:

feature ‘frac’, referenced in aalt feature, either is not defined or had no rules which could be included in the aalt feature.

However, I do have a frac feature which is auto generated. The feature seems to work fine, so is the error symptomatic of something else?

2

You can ignore this.

3

It is about aalt, which should only reference simple one-to-one substitutions. frac is probably contextual though, and then it will be ignored by makeotf, that’s all. Nothing to worry about.

4

Thanks. That all makes sense.