Constant BYNK_MAP_SRC 

pub const BYNK_MAP_SRC: &'static str;

bynk.map — combinators over the Map kernel (empty, insert, get, keys, length). fromList is deliberately absent: Bynk has no pair type to spell a List[(K, V)] with, so map construction is Map.empty()

• insert (revisit with tuples or generic records).