File: issue-92305.rs

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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()
}

fn g<T>(data: &[T], target: T) -> impl Iterator<Item = Vec<T>> {
    f(data).filter(|x| x == target)
}

fn main() {}