pub trait OnBoundFn<N> {
// Required method
fn call(
&self,
state: ScopeState,
bound_var: &BoundVar<N>,
) -> Option<FreeVar<N>>;
}pub trait OnBoundFn<N> {
// Required method
fn call(
&self,
state: ScopeState,
bound_var: &BoundVar<N>,
) -> Option<FreeVar<N>>;
}