[marks] warn on conflicting mark classes

googlefonts / fontc

Where in we pursue oxidizing (context: https://github.com/googlefonts/oxidize) fontmake.

Apache License 2.0

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[marks] warn on conflicting mark classes #804

Open cmyr opened 1 month ago

cmyr commented 1 month ago

These currently shouldn't happen as we generate one lookup per class, but just for future proofing when we are adding marks to a lookup builder we should check the returned result and warn if there is a conflict.