[Haskell-cafe] return with mutable object

Baojun Wang wangbj at gmail.com
Wed Jun 18 00:50:18 UTC 2014

Hi List,

Per my understanding, return x would make a new copy of the object. What if
the returned object is mutable? Will this make a new (mutable) object?

My concern is if I created a very large mutable object, does return mutable
make a full copy of the original mutable data, or just copy a reference

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