Struct Was 

pub struct Was<T> { /* private fields */ }

What an old save called a value (Yog Script’s was): its key then, and what reads it from a store as the value is now.

Implementations

impl<T: Schema> Was<T>

pub const fn renamed(key: &'static str) -> Self

The value under key before, of the same type.

pub const fn from<Old: Schema + Into<T>>(key: &'static str) -> Self

The value under key before, an Old the value is made from.