Convert string to str, warns: borrowed value does not live long enough?

help
1 
fn main(){
  let a = vec!["a".to_string(), "b".to_string(), "c".to_string()];
  let mut b: Vec<&str> = vec![];
  for each in a{
    b.push(each.as_str());       //borrowed value does not live long enough
  }
}

I want to iter the String vec, and collect each as str into another vec,
but it warns : borrowed value does not live long enough
how to deal with it?
thanks.

2

You're almost there, but you're iterating by consuming a, so each each goes out of scope after its loop iteration. If you iterate in a way that doesn't consume a, then you can still reference its contents:

fn main() {
    let a = vec!["a".to_string(), "b".to_string(), "c".to_string()];
    let mut b: Vec<&str> = vec![];
    for each in &a {
        b.push(each.as_str()); //borrowed value does not live long enough
    }
    dbg!(b);
}

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=0c52ccfd7a58b0ac8177a344afed769f

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