Features prevents from generating
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If a ufo (accidentally) contains some incomplete feature code, for example only this:
feature liga { sub f' i' by f_i; sub f' l' by f_l; } liga;
the ufo doesn't generate anymore (although it looks like it does). No problem, but any kind of warning would be nice ;-)
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this is a v1.1 bug and will be solved in the next version
there are no print statements anymore captured from FDK after it fails some where (like in your example)