Module clone_cell::clone
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Provides the PureClone trait, which is a restrictive form of Clone that does not mutate
the containing Cell.
Conceptually, the relationship between Copy, Clone, and PureClone can be thought of as
follows:
Copy: PureClone: ClonePureClone is unsafe because the clone implementation must not mutate the content of Cell
through the &self reference it gets with interior mutability. See this Stack Overflow answer
and this Rust forum thread for details.
When this crate is built with the "derive" feature, the PureClone
proc macro can be used to derive PureClone for user types.