/guava/android/guava/src/com/google/common/collect/Maps.java
checkNotNull( left) ;this.map = checkNotNull( map) ;
this.map = checkNotNull ( map ) ;
} } static class KeySet<K extends @Nullable Object, V extends @Nullable Object> extends Sets.ImprovedAbstractSet<K> { @Weak final Map<K, V> map; KeySet(Map<K, V> map) { <extra_id_0> } Map<K, V> map() { return map; } @Override public Iterator<K> iterator() {