pub trait Env {
// Provided methods
fn get_attr(&self, _key: Atom) -> Option<GenType> { ... }
fn set_attr(&self, _key: Atom, _value: GenType) -> Option<GenType> { ... }
fn remove_attr(&self, _key: Atom) -> Option<GenType> { ... }
}pub trait Env {
// Provided methods
fn get_attr(&self, _key: Atom) -> Option<GenType> { ... }
fn set_attr(&self, _key: Atom, _value: GenType) -> Option<GenType> { ... }
fn remove_attr(&self, _key: Atom) -> Option<GenType> { ... }
}