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Define an unmodifiable empty map
import collections
EmptyDict = collections.namedtuple("EmptyDict", "")
e = EmptyDict()
EmptyDict = collections.namedtuple("EmptyDict", "")
e = EmptyDict()
const std::map<T1,T2> immutable_map_instance_of_type_t1_to_t2;
; Clojure maps are immutable
(def m {})
(def m {})
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