Function extern_spec_T_A_VecDeque_T_A_clear 

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

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

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

terminates

ghost

ensures

(^self)@.len() == 0