def Map.has.leaf
import Base2879def Map.has.leaf(a, -V: Kind(a), v: V, r: (String & String) & Cmp) ->
2880 Map<a, V> & Bool:
2881 ((key2, k2), c) = r
2882 (MLeaf{k2, v}, Cmp.is_eq(c))
import Base2879def Map.has.leaf(a, -V: Kind(a), v: V, r: (String & String) & Cmp) ->
2880 Map<a, V> & Bool:
2881 ((key2, k2), c) = r
2882 (MLeaf{k2, v}, Cmp.is_eq(c))