Function extern_spec_T_A_Extend_T_Vec_T_A_extend 

pub fn extern_spec_T_A_Extend_T_Vec_T_A_extend<T, A: Allocator, I: IntoIterator<Item = T, IntoIter: IteratorSpec>>(
    self_: &mut Vec<T, A>,
    iter: I,
)

extern spec for Vec<T, A>::extend

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

requires

I::into_iter.precondition((iter,))

ensures

self