TIL `consume` operator to end the lifetime of a variable binding, available from Swift 5.9

TIL consume operator to end the lifetime of a variable binding, available from Swift 5.9.

Swift proposal consume operator to end the lifetime of a variable binding.

Does consume make autoreleasing redundant?

Swift proposal borrowing and consuming parameter ownership modifiers.

That is where the consume operator comes into play. consume consumes the current value of a binding with static lifetime, which is either an unescaped local let, unescaped local var, or function parameter, with no property wrappers or get/set/read/modify/etc. accessors applied.

What are these local let and local var? What is read accessor?