Function lemma_optional_end_prepare_congruence 

pub broadcast proof fn lemma_optional_end_prepare_congruence<A, B>(
    a: OptionalEnd<A>,
    b: OptionalEnd<B>,
)
where
    A: Consistency + SpecByteLen<T = A::Val>,
    B: Consistency<Val = A::Val> + SpecByteLen<T = A::Val>,

requires

prepare_congruent(a.0, b.0),

ensures

#[trigger] prepare_congruent(a, b),