Function extern_spec_T_A_VecDeque_T_A_push_front 

pub fn extern_spec_T_A_VecDeque_T_A_push_front<T, A: Allocator>(
    self_: &mut VecDeque<T, A>,
    value: T,
)

extern spec for VecDeque<T, A>::push_front

This is not a real function: its only use is for documentation.

terminates

ensures

(^self)@.len() == self@.len() + 1

ensures

(^self)@ == self@.push_front(value)