Cheatsheet recap

One line per idea, in order. The pause-for-questions slide.

Idea	Remember
Three escape hatches	each one trades a check for a capability.
Box puts a value on the heap	box puts one value on the heap and owns it.
Why Box really exists	box gives a recursive type a known size.
Deref, and the quiet coercion	`*` follows the pointer; coercion does it for you.
Rc shares one value	rc gives many owners; the count frees the value at zero.
RefCell moves the rules to runtime	refcell moves the borrow rules to runtime; break them and it panics.
Rc<RefCell<T>>, shared and mutable	rc<refcell<t>> is shared plus mutable, single-threaded.
Drop puts cleanup in the type	drop runs at scope exit; you never call it yourself.
When to reach for each	match the need to the pointer.

All slides