How to use the immutables.map.Map._new function in immutables
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MagicStack / immutables / immutables / map.py View on Github 
def finish(self):
self.__mutid = 0
return Map._new(self.__count, self.__root)def set(self, key, val):
new_count = self.__count
new_root, added = self.__root.assoc(0, map_hash(key), key, val, 0)
if new_root is self.__root:
assert not added
return self
if added:
new_count += 1
return Map._new(new_count, new_root)
