fonttools/Tests/feaLib/data/multiple_feature_blocks.fea

languagesystem DFLT dflt;
languagesystem latn dflt;
languagesystem latn TRK;

feature liga {
    lookup liga_fl {
        sub f l by f_l;
    } liga_fl;
} liga;

feature liga {
    lookup liga_fi {
        sub f i by f_i;
    } liga_fi;

    script latn;
    language TRK exclude_dflt;
} liga;