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// edition:2021
use std::iter;
fn f<T>(data: &[T]) -> impl Iterator<Item = Vec> {
//~^ ERROR: missing generics for struct `Vec` [E0107]
iter::empty() //~ ERROR: type annotations needed [E0282]
}
fn g<T>(data: &[T], target: T) -> impl Iterator<Item = Vec<T>> {
//~^ ERROR: type annotations needed [E0282]
f(data).filter(|x| x == target)
}
fn main() {}
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