[[Rust]]
[[A place is anything that is valid to put on the left-hand side of an assignment]]
[[Lifetime specifier]]

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Rust has a permission system similar to file permissions for variables:
- R: read: data can be copied
- W: write: data can be mutated
- O: own: data can be moved or dropped
- F: Flow: expected when a function input uses a reference or when a function returns a reference

The default is : "RO". `mut` adds "W".