fonttools/Tests/feaLib/data/aalt_chain_contextual_subst.fea

# https://github.com/googlefonts/fontmake/issues/648

lookup CNTXT_LIGS {
    sub f i by f_i;
    sub c t by c_t;
} CNTXT_LIGS;

lookup CNTXT_SUB {
    sub n by n.end;
    sub s by s.end;
} CNTXT_SUB;

feature calt {
    sub [a e i o u] f' lookup CNTXT_LIGS i' n' lookup CNTXT_SUB;
    sub [a e i o u] c' lookup CNTXT_LIGS t' s' lookup CNTXT_SUB;
} calt;

feature aalt {
    feature calt;
} aalt;