Function apply_chain_context

fn apply_chain_context(
    ctx: &mut hb_ot_apply_context_t<'_, '_>,
    backtrack: LazyArray16<'_, u16>,
    input: LazyArray16<'_, u16>,
    lookahead: LazyArray16<'_, u16>,
    match_funcs: [&(dyn Fn(GlyphId, u16) -> bool + '_); 3],
    lookups: LazyArray16<'_, SequenceLookupRecord>,
) -> Option<()>