deepclone 0.3.1

Deep clone that copies shared data once: an `Rc`/`Arc` reached twice becomes one new `Rc`/`Arc`
Documentation
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error: unknown `deepclone` container attribute, expected `clone` or `bound = ".."`
 --> tests/ui/unknown_container_attribute.rs:4:13
  |
4 | #[deepclone(transparent)]
  |             ^^^^^^^^^^^