own_ref RFC initial commit

[CheaterCodes]

Introduce owning references &own into the language, which allows passing ownership of the pointee without moving its value.
Owning references can be moved out of (including partial moves), and drop their pointee when dropped.

fn print_all(producers: &own [&own dyn FnOnce() -> String]) {
    for producer in producers {
        println!("Got value: {}", producer());
    }
}

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Rendered

[CheaterCodes]

To create the appropriate cross-links to relevant issues:

• Issue for owned references: Owned references to contents in an earlier stack frame (&own, &move, etc) #998
• Issue for moving/owned deref: Extending deref/index with ownership transfer: DerefMove, IndexMove, IndexSet #997

[programmerjake]

Suggested change

	We use `&[T]` for read-only slices, `&mut T` for mutable slices.
	We use `&[T]` for read-only slices, `&mut [T]` for mutable slices.

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[programmerjake]

quotes need to use > on every line. also ownership is misspelled

View changes since the review