* Delete test_token_references, which checked a flakey strategy for preventing orphan tokens from a while ago. Now orphan tokens simply hold a reference to Pool, preventing the memory from being freed underneath them. This means that we don't need to run this slow test.
* Delete test_token_references, which checked a flakey strategy for preventing orphan tokens from a while ago. Now orphan tokens simply hold a reference to Pool, preventing the memory from being freed underneath them. This means that we don't need to run this slow test.

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