fonttools/Tests/feaLib/data/spec5fi4.fea

# OpenType Feature File specification, section 5.f.i, example 4
# "Specifying a Chain Sub rule and marking sub-runs"
# http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html

languagesystem latn dflt;

feature test {
    sub [e e.begin]' t' c by ampersand;
} test;