Using sets as keys to a HashMap

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How can I use some sort of set(unorder collection of strings) as the keys for a HashMap?

I'm trying to port PBC/HowCanYouPayMana.v3.py at master · DrAlta/PBC · GitHub

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BTreeSet implements Hash and can be used as the key in a HashMap.

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Kind of ironic that HashSet doesn't have an impl for Hash.

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Since the HashSet doesn't have defined ordering of its element, it cannot generates consistent hash over different HashSets with same elements.

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It was once attempted:
https://github.com/rust-lang/rust/pull/48366

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